7704-34-9 Usage
Chemical Description
Different sources of media describe the Chemical Description of 7704-34-9 differently. You can refer to the following data:
1. Sulfur is a chemical element.
2. Sulfur is a yellow solid that is used in the production of sulfuric acid.
3. Sulfur is a nonmetallic element that is often used in organic synthesis as a reducing agent or to promote cyclization reactions.
4. Sulfur and chloranil are used in attempts to dehydrogenate some of the addition products, while bromine is used in the synthesis of tetrabromide of 1,4-diphenylbutadiene.
5. Sulfur is used as a reagent in the reactions to form the sulfur-containing rings.
Description
Sulfur belongs to a nonmetallic chemical element (pure product: yellow crystalline solid) under the symbol S. It can actively react with many other elements. It exists in various kinds of forms and compound such as sulfide and sulfate minerals which can be found everywhere around the universe and earth. It is also a key element for all life as the major component of amino acids, vitamins and many other cofactors. Sulfur has applications in various kinds of fields. For example, one of its biggest applications is for the production of sulfuric acid for sulfate and phosphate fertilizers. It is also used for the manufacturing of insecticides, fungicides, and bactericides. In pharmaceutical, it can be used for the manufacturing of many kinds of sulfur-containing antibiotics.
Chemical Properties
Sulfur, S, is a nonmetallic element that exists in a crystalline or amorphous form and in four stable isotopes. Sulfur melts at temperatures rangingfrom 112.8°C (234 °F) for the rhombic form to 120.0°C(248 °F) for amorphous sulfur,and all forms boil at 444.7°C (835°F). Sulfur occurs as free sulfur in many volcanic areas and is often associated with gypsum and limestone. It is used as a chemical intermediate and fungicide and in the vulcanization of rubber.
Physical properties
Sulfur is considered a nonmetallic solid. It is found in three allotropic crystal forms:1. Orthorhombic (or rhombic) octahedral lemon-yellow crystals, which are also called“brimstone” and referred to as “alpha” sulfur. The density of this form of sulfur is 2.06g/cm3, with a melting point of 95.5°C.2. Monoclinic, prismatic crystals, which are light-yellow in color. This allotrope is referredto as “beta” sulfur. Its density is 1.96 g/cm3, with a melting point of 119.3°C.3. Amorphous sulfur is formed when molten sulfur is quickly cooled. Amorphous sulfur issoft and elastic, and as it cools, it reverts back to the orthorhombic allotropic form.Sulfur, in its elemental form, is rather common and does not have a taste or odor except whenin contact with oxygen, when it forms small amounts of sulfur dioxide.
Isotopes
There are a total of 24 isotopes of sulfur; all but four of these are radioactive.The four stable isotopes and their contribution to sulfur’s total abundance on Earth areas follows: S-32 contributes 95.02% to the abundance of sulfur; S-33, just 0.75%; S-34,4.21%; and S-36, 0.02%.
Origin of Name
From the Sanskrit word sulvere and the Latin word sulphurim.
Occurrence
Sulfur has been known since ancient times primarily because it is a rather common substance.It is the 15th most common element in the universe, and though it is not found in allregions of the Earth, there are significant deposits in south Texas and Louisiana, as well in allvolcanoes. Sulfur makes up about 1% of the Earth’s crust.Sulfur is an element found in many common minerals, such as galena (PbS), pyrite(fool’s gold, FeS2), sphalerite (ZnS), cinnabar (HgS), and celestite (SrSO4), among others.About 1/4 of all sulfur procured today is recovered from petroleum production. Themajority of sulfur is the result of or a by-product of mining other minerals from the orescontaining sulfur.Sulfur is mined by the recovery method known as the Frasch process, which was inventedby Herman Frasch in Germany in the early 1900s. This process forces superheated water,under pressure, into deep underground sulfur deposits. Compressed air then forces the moltensulfur to the surface, where it is cooled. There are other methods for mining sulfur, but theFrasch process is the most important and most economical.Sulfur is found in Sicily, Canada, Central Europe, and the Arabian oil states, as well as inthe southern United States in Texas and Louisiana and offshore beneath the Gulf of Mexico.
Characteristics
Sulfur exhibits a remarkable array of unique characteristics. Today, there are chemistsdevoting large portions of their careers to studying this unusual element. For example, whensulfur is melted, its viscosity increases, and it turns reddish-black as it is heated. Beyond200°C, the color begins to lighten, and it flows as a thinner liquid.Sulfur burns with a beautiful subdued blue flame. The old English name for sulfur was“brimstone,” which means “a stone that burns.” This is the origin of the term “fire and brimstone”when referring to great heat. Above 445°C, sulfur turns to a gas, which is dark orangeyellowbut which becomes lighter in color as the temperature rises.Sulfur is an oxidizing agent and has the ability to combine with most other elements toform compounds.
History
Different sources of media describe the History of 7704-34-9 differently. You can refer to the following data:
1. Sulfur was known to the alchemists from ancient times as brimstone. Lavoisier in 1772 proved sulfur to be an element. The element derived its name from both the Sanskrit and Latin names Sulvere and Sulfurium, respectively. Sulfur is widely distributed in nature, in earth's crust, ocean, meteorites, the moon, sun, and certain stars. It also is found in volcanic gases, natural gases, petroleum crudes, and hot springs. It is found in practically all plant and animal life. Most natural sulfur is in iron sulfides in the deep earth mantle. The abundance of sulfur in earth’s crust is about 350 mg/kg. Its average concentration in seawater is estimated to be about 0.09%. Sulfur occurs in earth’s crust as elemental sulfur (often found in the vicinity of volcanoes), sulfides, and sulfates. The most important sulfur-containing ores are iron pyrite, FeS2; chalcopyrite, CuFeS2; sphalerite, ZnS; galena, PbS; cinnabar HgS; gypsum CaSO4?2H2O; anhydrite CaSO4; kieserite, MgSO4?H2O; celestite, SrSO4; barite, BaSO4; and. stibnite, Sb2S3.
2. Sulfur is found
in meteorites. A dark area near the crater Aristarchus on the
moon has been studied by R. W. Wood with ultraviolet light.
This study suggests strongly that it is a sulfur deposit. Sulfur
occurs native in the vicinity of volcanoes and hot springs. It is
widely distributed in nature as iron pyrites, galena, sphalerite,
cinnabar, stibnite, gypsum, Epsom salts, celestite, barite, etc.
Sulfur is commercially recovered from wells sunk into the salt
domes along the Gulf Coast of the U.S. It is obtained from
these wells by the Frasch process, which forces heated water
into the wells to melt the sulfur, which is then brought to the
surface. Sulfur also occurs in natural gas and petroleum crudes
and must be removed from these products. Formerly this was
done chemically, which wasted the sulfur. New processes
now permit recovery, and these sources promise to be very
important. Large amounts of sulfur are being recovered from
Alberta gas fields. Sulfur is a pale yellow, odorless, brittle solid
that is insoluble in water but soluble in carbon disulfide. In every
state, whether gas, liquid or solid, elemental sulfur occurs
in more than one allotropic form or modification; these present
a confusing multitude of forms whose relations are not yet
fully understood. Amorphous or “plastic” sulfur is obtained
by fast cooling of the crystalline form. X-ray studies indicate
that amorphous sulfur may have a helical structure with eight
atoms per spiral. Crystalline sulfur seems to be made of rings,
each containing eight sulfur atoms that fit together to give a
normal X-ray pattern. Twenty-one isotopes of sulfur are now
recognized. Four occur in natural sulfur, none of which is radioactive.
A finely divided form of sulfur, known as flowers
of sulfur, is obtained by sublimation. Sulfur readily forms sulfides
with many elements. Sulfur is a component of black gunpowder,
and is used in the vulcanization of natural rubber and
a fungicide. It is also used extensively is making phosphatic
fertilizers. A tremendous tonnage is used to produce sulfuric
acid, the most important manufactured chemical. It is used
in making sulfite paper and other papers, as a fumigant, and
in the bleaching of dried fruits. The element is a good electrical
insulator. Organic compounds containing sulfur are very
important. Calcium sulfate, ammonium sulfate, carbon disulfide,
sulfur dioxide, and hydrogen sulfide are but a few of the
many other important compounds of sulfur. Sulfur is essential
to life. It is a minor constituent of fats, body fluids, and skeletal
minerals. Carbon disulfide, hydrogen sulfide, and sulfur
dioxide should be handled carefully. Hydrogen sulfide in small
concentrations can be metabolized, but in higher concentrations
it can quickly cause death by respiratory paralysis. It is
insidious in that it quickly deadens the sense of smell. Sulfur
dioxide is a dangerous component in atmospheric pollution.
Sulfur (99.999%) costs about $575/kg.
Uses
Different sources of media describe the Uses of 7704-34-9 differently. You can refer to the following data:
1. sulfur (colloidal) reduces oil-gland activity and dissolves the skin’s surface layer of dry, dead cells. This ingredient is commonly used in acne soaps and lotions, and is a major component in many acne preparations. It can cause allergic skin reactions.
2. sulfur is a mild anti-septic used in acne creams and lotions. It stimulates healing when used on skin rashes. Sulfur may cause skin irritation.
3. Elemental sulfur is used for vulcanizing rubber; making black gunpowder; as a soil conditioner; as a fungicide; preparing a number of metal sulfides; and producing carbon disulfide. It also is used in matches; bleaching wood pulp, straw, silk, and wool; and in synthesis of many dyes. Pharmaceutical grade precipitated and sublimed sulfurs are used as scabicides and as antiseptics in lotions and ointments.
Important sulfur compounds include sulfuric acid, sulfur dioxide, hydrogen 890 SULFUR sulfide, sulfur trioxide, and a number of metal sulfides and metal oxo- salts such as sulfates, bisulfates, and sulfites. Numerous organic compounds contain sulfur, such as mercaptans, thiophenes, thiophenols, sulfate esters, sulfones, and carbon disulfide.
4. Sulfur is one of the four major commodities of the chemical industry. The other three arelimestone, coal, and salt. Most sulfur that is produced is used to manufacture sulfuric acid(H2SO4). Forty million tons are produced each year in the manufacture of fertilizers, lead-acidbatteries, gunpowder, desiccants (drying agent), matches, soaps, plastics, bleaching agents,rubber, road asphalt binders, insecticides, paint, dyes, medical ointment, and other pharmaceuticalproducts, among many, many other uses. Sulfur is essential to life.
Definition
sulphur: Symbol S. A yellow nonmetallic element belonging to group 16 (formerly VIB) of the periodic table; a.n. 16; r.a.m. 32.06; r.d. 2.07 (rhombic); m.p. 112.8°C; b.p. 444.674°C. The element occurs in many sulphide and sulphate minerals and native sulphur is also found in Sicily and the USA (obtained by the Frasch process). It can also be obtained from hydrogen sulphide by the Claus process.Sulphur has various allotropic forms. Below 95.6°C the stable crystal form is rhombic; above this temperature the element transforms into a triclinic form. These crystalline forms both contain cyclic S8 molecules. At temperatures just above its melting point, molten sulphur is a yellow liquid containing S8 rings (as in the solid form). At about 160°C,the sulphur atoms form chains and the liquid becomes more viscous and dark brown. If the molten sulphur is cooled quickly from this temperature (e.g. by pouring into cold water) a reddish-brown solid known as plastic sulphur is obtained. Above 200°C the viscosity decreases. Sulphur vapour contains a mixture of S2, S4, S6, and S8 molecules. Flowers of sulphur is a yellow powder obtained by subliming the vapour. It is used as a plant fungicide. The element is also used to produce sulphuric acid and other sulphur compounds.Sulphur is an essential element in living organisms, occurring in the amino acids cysteine and methionine and therefore in many proteins. It is also a constituent of various cell metabolites, e.g. coenzyme A. Sulphur is absorbed by plants from the soil as the sulphate ion (SO42–).
Production Methods
Elemental sulfur is recovered from its ore deposits found throughout the world. It is obtained commercially by the Frasch process, recovery from wells sunk into salt domes. Heated water under pressure is forced into the underground deposits to melt sulfur. Liquid sulfur is then brought to the surface. Sulfur is recovered by distillation. Often the ore is concentrated by froth flotation.
Elemental sulfur also is recovered as a by-product in processing natural gas and petroleum. Refining operations of natural gas and petroleum crude produce hydrogen sulfide, which also may occur naturally. Hydrogen sulfide is separated from hydrocarbon gases by absorption in an aqueous solution of alkaline solvent such as monoethanol amine. Hydrogen sulfide is concentrated in this solvent and gas is stripped out and oxidized by air at high temperature in the presence of a catalyst (Claus process).
Elemental sulfur also may be obtained by smelting sulfide ores with a reducing agent, such as coke or natural gas, or by reduction of sulfur dioxide.
Reactions
Sulfur forms two oxides, sulfur dioxide, SO2, and the trioxide, SO3. It burns in oxygen at about 250°C or in air above 260°C, forming sulfur dioxide. In excess oxygen the trioxide is obtained.
Sulfur reacts with hydrogen at 260 to 350°C forming hydrogen sulfide. The reaction is slow at this temperature and does not go to completion. The reaction is catalyzed by activated alumina.
Reactions with excess chlorine or fluorine yield sulfur tetrachloride, SCl4, or hexafluoride, SF6. These reactions occur under cold conditions.
Sulfur reacts with sulfur dioxide in an electric discharge to form disulfuroxide, S2O.
Sulfur reacts with aqueous sulfide to form polysulfides: S + Na2S → Na2S2
With aqueous solution of sulfite the product is thiosulfate:
S + SO32– → S2O32–
Thiosulfate also is obtained by heating sulfur with powdered sulfite:
S + Na2SO3 → Na2S2O3
When heated with alkali cyanide, thiocyanate salt is obtained:
S + KCN → KSCN
A similar reaction occurs in the aqueous phase in which thiocyanate is obtained by evaporation and crystallization.
Sulfur combines with alkali metals, copper, silver, and mercury on cold contact with the solid, forming sulfides. Reactions with magnesium, zinc, and cadmium occur to a small degree at ordinary temperatures, but rapidly on heating. Sulfur reacts with phosphorus, arsenic, antimony, bismuth, and silicon at their melting points and with other elements at elevated temperatures forming binary sulfides. Sulfides of tellurium, gold, platinum, and iridium are difficult to obtain even at elevated temperatures. Sulfur does not react with inert gases, nitrogen, and iodine.
Brand name
Liquamat (Galderma ); Sastid (Stiefel); Sulfur Soap (Stiefel).
General Description
A pale yellow crystalline solid with a faint odor of rotten eggs. Insoluble in water. A fire and explosion risk above 450° F. Transported as a yellow to red liquid. Handled at elevated temperature (typically 290°F) to prevent solidification and makes transfers easier. Hot enough that plastic or rubber may melt or lose strength. Causes thermal burns to skin on contact. Cools rapidly and solidifies if released. Equipment designed to protect against ordinary chemical exposure is ineffective against the thermal hazard. Exercise caution walking on the surface of a spill to avoid breakthrough into pockets of molten sulfur below the crust. Do not attempt to remove sulfur impregnated clothing because of the danger of tearing flesh if a burn has resulted. May be irritatin to skin, eyes and mucous membranes. Used in sulfuric acid production, petroleum refining, and pulp and paper manufacturing.
Air & Water Reactions
Flammable. Insoluble in water.
Reactivity Profile
SULFUR reacts violently with strong oxidizing agents causing fire and explosion hazards [Handling Chemicals Safely 1980 p. 871]. Reacts with iron to give pyrophoric compounds. Attacks copper, silver and mercury. Reacts with bromine trifluoride, even at 10°C [Mellor 2:113. 1946-47]. Ignites in fluorine gas at ordinary temperatures [Mellor 2:11-13 1946-47]. Reacts to incandescence with heated with thorium [Mellor 7:208 1946-47]. Can react with ammonia to form explosive sulfur nitride. Reacts with calcium phosphide incandescently at about 300°C. Reacts violently with phosphorus trioxide [Chem. Eng. News 27:2144 1949]. Mixtures with ammonium nitrate or with metal powders can be exploded by shock [Kirk and Othmer 8:644]. Combinations of finely divided sulfur with finely divided bromates, chlorates, or iodates of barium, calcium, magnesium, potassium, sodium, or zinc can explode with heat, friction, percussion, and sometimes light [Mellor 2 Supp.1:763. 1956]. A mixture with barium carbide heated to 150°C becomes incandescent. Reacts incandescently with calcium carbide or strontium carbide at 500°C. Attacks heated lithium, or heated selenium carbide with incandescence [Mellor 5:862 1946-47]. Reacts explosively if warmed with powdered zinc [Mellor 4:476. 1946-47]. Reacts vigorously with tin [Mellor 7:328. 1946-47]. A mixture with potassium nitrate and arsenic trisulfide is a known pyrotechnic formulation [Ellern 1968 p. 135]. Mixtures with any perchlorate can explode on impact [ACS 146:211-212]. A mixture of damp sulfur and calcium hypochlorite produces a brilliant crimson flash with scatter of molten sulfur [Chem. Eng. News 46(28):9 1968]. Takes fire spontaneously in chlorine dioxide and may produce an explosion [Mellor 2:289 (1946-47)]. Ignites if heated with chromic anhydride ignite and can explode, [Mellor 10:102 (1946-47)]. Even small percentages of hydrocarbons in contact with molten sulfur generate hydrogen sulfide and carbon disulfide, which may accumulate in explosive concentrations. Sulfur reacts with Group I metal nitrides to form flammable mixtures, evolving flammable and toxic NH3 and H2S gasses if water is present. (Mellor, 1940, Vol. 8, 99).
Hazard
Many of the sulfur compounds are toxic but essential for life. The gas from elemental sulfurand from most of the compounds of sulfur is poisonous when inhaled and deadly wheningested. This is the reason that sulfur compounds are effective for rat and mice exterminationas well an ingredient of insecticides. Sulfa drugs (sulfanilamide and sufadiazine), althoughtoxic, were used as medical antibiotics during World War II before the development of penicillin.They are still used today in veterinary medicine.
Health Hazard
Can cause eye irritation; may rarely irritate skin. If recovered sulfur, refer to hydrogen sulfide.*
Flammability and Explosibility
Nonflammable
Agricultural Uses
Different sources of media describe the Agricultural Uses of 7704-34-9 differently. You can refer to the following data:
1. Brimstone is coarsely ground sulphur which is used to
increase the acidity of soil and correct sulphur deficiency
inplants.
2. Sulphur (S) is a yellow, non-metallic element belonging
to Group 16 (formerly VI B) of the Periodic Table. It is a macronutrient required by plants in
relatively large amounts. Potato, cereals and grasses
require about 20 kg/ha sulphur, while its ideal dosage for
the Brassiceae family of crops is 50 kg/ha.
Soil-sulphur reactions are similar to soil-nitrogen
reactions, and are dominated by organic or microbial
fractions in the soil. Approximately 90% sulphur
required by plants is for the synthesis of amino acids
(namely, cysteine, cystine and methionhe) which are essential components of proteins and contain 6 to 8% S.
One of the main functions of sulphur in proteins is to form
sulphur-sulphur (-S-S-) bonds between polypeptide
chains which are essential for the protein conformation
relevant to its catalytic or structural properties.
Depending on their sulphur requirement, crops are
divided into three groups. The first includes crops with a
high sulphur requirement - in a range 20 to 80 kg/ha.
Crucifers and Brassiceae fall in this group. The second
group requires sulphur in a moderate range - 10 to 50
kg/ha and includes plantation crops. The third group
needs sulphur in small quantities - 5 to 25 kg/ha and
includes cereals, forages and other field crops. As a rule,
sulphur requirement is 3 to 4 kg/ton of grains, 8 kg/ton of
grain legumes and 12 kg/ton of oil seeds.
Soil can lose sulphur by (a) its removal by crops,
(b) leaching and erosion, (c) sulphate adsorption
and retention by clays, and (d) cultivation.
Decomposition of organic matter is accelerated by
cultivation, which improves soil segregation and
aeration. The oxidation of organic matter causes a
decline in organic sulphur.
Sulphur is needed for the synthesis of co-enzyme A,
biotin, thiamine and glutathione. It is also present in
substances like sulphur-adenosyl methionhe, formyl
methionhe, lipoic acid and sulfolipid.
Sulphur plays an important role in chlorophyll
synthesis. It is part of ferridoxins, a type of non-heme
iron-sulphur (Fe-S) protein occurring in chloroplasts and
involved in the reduction of nitrite and sulphate, and in
the assimilation of nitrogen by bacteria.
Sulphur enhances the formation of oil in crops like
soybean and flax. Plant roots absorb sulphur as sulphate
ions. Small quantities of sulphur dioxide (SO2) can be
absorbed through plant leaves and used in the plant. The
concentration of sulphur in plants is 0.1 to 4% which is
equal to, or less than, the amount of phosphorus in wheat,
corn, beans and potato but is more than the phosphorus
content in alfalfa, cabbage and turnip.
There is a close relationship between organic C, total
N and total S in soils. The C: N: S ratio in most welldrained,
non-calcareous soils is approximately
120: 10: 1.4. Generally, the C: S ratio varies much more
than the N: S ratio, the latter falling within a narrow
range of 6 to 8.1. Sulphur may be immobilized in soils
whenthe C: S or N: S ratio is large.
Safety Profile
Poison by ingestion, intravenous, and intraperitoneal routes. A human eye irritant. A fungcide. Chronic inhalation can cause irritation of mucous membranes. Combustible when exposed to heat or flame or by chemical reaction with oxidzers. Explosive in the form of dust when exposed to flame. Can react violently with halogens, carbides, halogenates, halogenites, zinc, uranium, tin, sodium, lithium, nickel, palladium, phosphorus, potassium, indum, calcium, boron, aluminum, (aluminum + niobium pentoxide), ammonia, ammonium nitrate, ammonium perchlorate, BrF5, BrF3, (Ca + VO + H20), Ca(OCl)2, Cad%, Cs3N, charcoal, (Cu + chlorates), ClO2, Cl0, ClF3, CrO3, Cr(OCl)2, hydrocarbons, IF5,IO5, Pb02, Hg(NO3)2, HgO, Hg20, NO2, P2O3, (KNO3 + As2S3), K3N, KMn04, AgNO3, Ag20, NaH, (NaNO3 + charcoal), (Na + SnI4), SCl2, T12O3, F2. Can react with oxidzing materials. To fight fire, use water or special mixtures of dry chemical. When heated it burns and emits highly toxic fumes of SOX. See also NUISANCE DUSTS.
Purification Methods
Murphy, Clabaugh & Gilchrist [J Res Nat Bur Stand 64A 355 1960] have obtained sulfur of about 99.999% purity by the following procedure: Roll sulfur was melted and filtered through a coarse-porosity glass filter funnel into a 2L round-bottomed Pyrex flask with two necks. Conc H2SO4 (300mL) was added to the sulfur (2.5kg), and the mixture was heated to 150o, stirring continuously for 2hours. Over the next 6hours, conc HNO3 was added in about 2mL portions at 10-15minutes intervals to the heated mixture. It was then allowed to cool to room temperature and the acid was poured off. The sulfur was rinsed several times with distilled water, then remelted, cooled, and rinsed several times with distilled water again, this process being repeated four or five times to remove most of the acid entrapped in the sulfur. An air-cooled reflux tube (ca 40cm long) was attached to one of the necks of the flask, and a gas delivery tube (the lower end about 2.5cm above the bottom of the flask) was inserted into the other. While the sulfur was boiled under reflux, a stream of helium or N2 was passed through to remove any water, HNO3 or H2SO4, as vapours. After 4hours, the sulfur was cooled so that the reflux tube could be replaced by a bent air-cooled condenser. The sulfur was then distilled, rejecting the first and the final 100mL portions, and transferred in 200mL portions to 400mL glass cylinder ampoules (which were placed on their sides during solidification). After adding about 80mL of water, displacing the air with N2, the ampoule was cooled, and the water was titrated with 0.02M NaOH, the process being repeated until the acid content was negligible. Finally, entrapped water was removed by alternate evacuation to 10mm Hg and refilling with N2 while the sulfur was kept molten. The ampoules were then sealed. Other purifications include crystallisation from CS2 (which is less satisfactory because the sulfur retains appreciable amounts of organic material), *benzene or *benzene/acetone, followed by melting and degassing. It has also been boiled with 1% MgO, then decanted, and dried under a vacuum at 40o for 2days over P2O5. [For the purification of S6, “recrystallised S8” and “Bacon-Fanelli sulfur” see Bartlett et al. J Am Chem Soc 83 103, 109 1961.]
References
https://en.wikipedia.org/wiki/Sulfur#Applications
http://geology.com/minerals/sulfur.shtml
http://www.wisegeek.org/what-is-sulfur.htm
Check Digit Verification of cas no
The CAS Registry Mumber 7704-34-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,0 and 4 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 7704-34:
(6*7)+(5*7)+(4*0)+(3*4)+(2*3)+(1*4)=99
99 % 10 = 9
So 7704-34-9 is a valid CAS Registry Number.
InChI:InChI=1/S
7704-34-9Relevant articles and documents
Steele, B. D.,Bagster, L. S.
, p. 2607 (1910)
EFFECT OF PREADSORBED SULFUR ON NITRIC OXIDE REDUCTION ON POROUS PLATINUM BLACK ELECTRODES.
Foral,Langer
, p. 257 - 263 (1988)
Sulfur can be deposited on porous platinum black gas diffusion cathodes to influence the course of the electrogenerative reduction of nitric oxide. Polarization (performance) curves and reactor selectivity data are compared for untreated cathodes and thos
Donath, E.
, p. 141 - 143 (1901)
Kinetic regularities of recovery of metals from raw materials of industrial origin
Velikanova,Semchenko,Khentov
, p. 1470 - 1475 (2011)
Kinetics of recovery of metals from the wastes and poor ores, which contain oxide and sulfide minerals of copper, vanadium, and silver with an azomethine solution in organic solvent was studied. The optimal parameters of the recovery were suggested.
The Dissociation Rate of S2 Produced from COS Pyrolysis
Higashihara, Tetsuo,Saito, Ko,Murakami, Ichiro
, p. 15 - 18 (1980)
The disappearance rate of S2, which was produced from the pyrolysis of COS, was measured behind incident shock waves by monitoring the UV emission in the temperature range of 4500-6000 K and in the pressure range of 0.32-0.5 atm.It was found that two proc
Infrared studies of the adsorption and surface reactions of hydrogen sulfide and sulfur dioxide on some aluminas and zeolites
Deo,Lana, I.G.Dalla,Habgood
, p. 270 - 281 (1971)
Adsorption of hydrogen sulfide, sulfur dioxide, and their mixtures on four different catalysts has been studied by infrared spectroscopy of the catalyst surfaces. The four catalysts, which show a wide range of acidity and are all active for the Claus reaction (2H2S + SO2 → 3S + 2H2O), were γ-alumina (the main constituent of commercial bauxite catalysts), γ-alumina doped with NaOH, sodium Y zeolite, and hydrogen Y zeolite. All catalysts showed physical adsorption of both reactants with strong hydrogen bonding to surface OH groups. This would suggest that the role of the catalyst is primarily to bring the reactants together in suitable orientation. On the other hand, γ-alumina shows, on heating with SO2, a chemisorbed SO2 species which may be a reaction intermediate. The NaOH-treated γ-alumina shows a second chemisorbed SO2 species which is irreversibly adsorbed and thus may be a catalyst poison.
Wright, L. T.
, p. 156 - 156 (1883)
Dunnicliff, H. B.,Nijhawan, S. D.
, (1926)
Use of cobalt(II) phthalocyanine sulfonates in gas purification to remove hydrogen sulfide
Faddeenkova,Kundo
, p. 1946 - 1950 (2003)
Experiments on liquid-phase oxidation of H2S with oxygen in the presence of catalysts, cobalt phthalocyanine sulfonates [CoPc(SO 3Na)n], were performed on a laboratory static installation in order to find conditions under which a stationary oxidation mode can be established at pH ≥ 8. The influence exerted by additional introduction of a soluble salt of Mn2+ (MnSO4, MnCl2) into the reaction mixture at various pH values was studied.
Carter, S. R.,Butler, J. A. V.
, p. 2370 - 2370 (1923)
Carter, S. R.,Butler, J. A. V.
, p. 2380 - 2380 (1923)
Wardlaw, W.,Carter, S. R.,Clews, F. H.
, p. 1241 - 1241 (1920)
Sato, Tetsuya,Kinugawa, Tohru,Arikwawa, Tatsuo,Kawasaki, Masahiro
, p. 173 - 182 (1992)
Corrosion mechanism of nickel in hot, concentrated H2SO4
Kish,Ives,Rodda
, p. 3637 - 3646 (2000)
Electrochemical techniques, complemented by weight change and ex situ X-ray spectroscopic measurements, were employed to characterize the corrosion of nickel in concentrated H2SO4 solutions. By use of a rotating cylinder electrode, it was found that corrosion is a mass-transport controlled process with the convective diffusion of nickel cations from a saturated NiSO4 layer as its rate-determining step. The oxidizing nature of the acid solution leads to the formation of additional corrosion products including metastable NiS, and elemental sulfur along with NiSO4, none of which is protective. When present on the surface, NiS establishes a galvanic interaction with the uncovered metal, significantly polarizing the anodic metal dissolution reaction. Since corrosion is mass-transport controlled, the resultant corrosion rate of the metal is unaffected during the galvanic-induced polarization.
The synthesis and characterization of Pb5S2I6 whiskers and tubules
Yang, Qing,Tang, Kaibin,Wang, Chunrui,Zuo, Jian,Qian, Yitai
, p. 670 - 674 (2003)
Pb5S2I6 whiskers and tubules were synthesized from the reaction among lead chloride, thiourea, and excess sodium iodide under hydrothermal conditions at 200 °C for 20-40 h. XRD, SEM, XPS, ICP-AES, and TEM characterized the final products. Most products are whiskers with structure of 3-4 mm in length, 0.5-2.0 μm in diameter for a singular one. Meanwhile, about 10% tubules are produced in the process. The tubules are 3-6 mm in length, 8-20 μm in diameter, and 1-3 μm in thickness. Nanowhiskers were also produced in the route at 180-200 °C for 8-10 h. Raman spectra show that the Pb5S2I6 crystals have complex vibrational modes of PbS and PbI2.
Iwasawa, Y.,Ogasawara, S.
, p. 132 - 142 (1977)
A facile in situ sulfur deposition route to obtain carbon-wrapped sulfur composite cathodes for lithium-sulfur batteries
Su, Yu-Sheng,Manthiram, Arumugam
, p. 272 - 278 (2012)
An in situ sulfur deposition route has been developed for synthesizing sulfur-carbon composites as cathode materials for lithium-sulfur batteries. This facile synthesis method involves the precipitation of elemental sulfur at the interspaces between carbon nanoparticles in aqueous solution at room temperature. The product has been characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, charge-discharge measurements, and electrochemical impedance spectroscopy. The sulfur-carbon composite cathode with 75 wt.% active material thus obtained exhibits a remarkably high first discharge capacity of 1116 mAh g-1 with good cycle performance, maintaining 777 mAh g-1 after 50 cycles. The significantly improved electrochemical performance of the sulfur-carbon composite cathode is attributed to the carbon-wrapped sulfur network structure, which suppresses the loss of active material during charging/discharging and the migration of the polysulfide ions to the anode (i.e., shuttling effect). The integrity of the cathode structure during cycling is reflected in low impedance values observed after cycling. This facile in situ sulfur deposition route represents a low-cost approach to obtain high-performance sulfur-carbon composite cathodes for rechargeable Li-S batteries.
Thermodynamics of copper sulfides. II. Heat capacity and thermodynamic properties of synthetic covellite, CuS, from 5 to 780.5 K. Enthalpy of decomposition
Westrum, Edgar F.,Stoelen, Svein,Groenvold, Fredrik
, p. 1199 - 1208 (1987)
The heat capacity of CuS has been measured by adiabatic shield calorimetry from 5 to 840 K.The heat capacity increases regularly up to about 750 K and then more strongly as the decomposition temperature (780.5 K) of covellite into high-digenite and sulfur is approached.The molar enthalpy and molar entropy of decomposition are 2149.3R*K and 2.755R.Above 780.5 K the uptake of sulfur in the high-digenite causes a further rise in the heat capacity.The low-temperature values increase more strongly than expected from the Debye relation with a Debye temperature estimated from the intermediate-temperature behavior.This phenomenon as well as a small bump in the heat capacity around 55 K are discussed.The resulting molar enthalpy and molar entropy at 298.15 and 825 K are 1136.6R*K, 8.101R, and 6744.2R*K, 17.393R, respectively.
A Novel Reaction of Metal Sulphides with the Mixed Non-aqueous System Dimethyl Sulphoxide-Sulphur Dioxide
Harrison, W. David,Gill, J. Bernard,Goodall, David C.
, p. 728 - 729 (1988)
Several synthetic and naturally occuring metal sulphides react with the system dimethyl sulphoxide-sulphur dioxide to give metal hydrogen sulphates or sulphates, in contrast with the reaction of sulphides with aqueous sulphur dioxide, which yields mainly thiosulphate.
Bellissent, R.,Descotes, L.,Boue, F.
, (1990)
Gibbs, W.
, p. 387 - 402 (1864)
Murthy, A. R. V.
, p. 388 - 401 (1952)
Structural determination of the S-passivated InP(100)-(1x1) surface by dynamical low-energy electron-diffraction analysis
Warren, O. L.,Anderson, G. W.,Hanf, M. C.,Griffiths, K.,Norton, P. R.
, (1995)
We have determined the optimum geometry of the S-passivated InP(100)-(1x1) surface by dynamical low-energy electron-diffraction analysis. S atoms bond to In by occupying the bridge site that continues the zinc-blendestacking sequence of the substrate. Oth
Skrabal
, p. 107 - 107 (1924)
High temperature H2S selective oxidation on a copper-substituted hexaaluminate catalyst: A facile process for treating low concentration acid gas
Hao, Zhengping,Jiang, Guoxia,Li, Ganggang,Xu, Xin,Zhang, Fenglian
supporting information, (2021/09/22)
H2S selective catalytic oxidation technology is a prospective way for the treatment of low concentration acid gas with simple process operation and low investment. However, undesirable results such as large formation of SO2 and catalyst deactivation inevitably occur, due to the temperature rise of fixed reaction bed caused by the exothermic reaction. Catalyst with high activity in wide operating temperature window, especially in high temperature range, is urgently needed. In this paper, a series of copper-substituted hexaaluminate catalysts (LaCux, x = 0, 0.5, 1, 1.5, 2, 2.5) were prepared and investigated for the H2S selective oxidation reaction at high temperature conditions (300-550°C). The LaCu1 catalyst exhibited excellent catalytic performance and great stability, which was attributed to the best reductive properties and proper pore structure. Besides, two facile deep processing paths were proposed to eliminate the remaining H2S and SO2 in the tail gas.
Synergistic effect of Bi-doped exfoliated MoS2 nanosheets on their bactericidal and dye degradation potential
Qumar,Ikram,Imran,Haider,Ul-Hamid,Haider,Riaz,Ali
, p. 5362 - 5377 (2020/05/08)
Nanosheets incorporated with biological reducing agents are widely used to minimize the toxic effects of chemicals. Biologically amalgamated metal oxide nanomaterials have crucial importance in nanotechnology. In this study, bare and bismuth (Bi)-doped molybdenum disulfide (MoS2) nanosheets were synthesized via a hydrothermal method. Different Bi weight ratios of 2.5, 5, 7.5 and 10% were incorporated in a fixed amount of MoS2 to evaluate its catalytic and antimicrobial activities. Doped nanosheets were characterized using XRD, FTIR and UV-vis spectroscopy, FESEM, HRTEM, Raman, PL, DSC/TGA, EDX, XRF and XPS analysis. The XRD spectra confirmed that the doped nanosheets exhibit a hexagonal structure and their crystallite size increases gradually upon doping. The morphology and interlayer d-spacing of doped MoS2 were determined by FESEM and HRTEM. The presence of functional groups in the doped nanosheets was confirmed using FTIR, PL and Raman analysis. The absorption intensity increased and the corresponding measured band gap energy decreased with doping. The thermal stability and weight loss behaviour of the prepared samples were studied using DSC/TGA. The doped MoS2 nanosheets showed a higher catalytic potential compared to undoped MoS2. The doped Bi nanosheets exhibited higher antimicrobial activity against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) at different concentrations of Bi (0.075 and 0.1), showing a tendency to counter the emerging drug resistance against pathogenic bacterial diseases. Consequently, significant inhibition zones were recorded against (MDR) S. aureus ranging from 2.25 to 3.3 mm and 3.25 to 5.05 mm at low and high concentrations of doped-Bi nanosheets and against Gram-negative E. coli ranging from 1 to 1.45 mm at high concentrations. In conclusion, the Bi-doped MoS2 nanocomposite has exhibited significant potential for use in industrial dye degradation applications. Its antibacterial properties can also mitigate health risks associated with the presence of several well-known pathogens in the environment.
Physicochemical studies on the desulfurization process of organosulfur compounds occur in crude oil by metallo-complexation method
Alhadhrami,Al-Ghamry, Mosad A.,Atta, Aly H.,El-Shenawy, Ahmed I.,Refat, Moamen S.,Al-Omar, Mohamed A.,Naglah, Ahmed M.
, p. 94 - 97 (2017/02/13)
All over the world researchers in accelerating to development the new and modern methods of desulfurization process to overcome the presence of residual sulfur compounds in the crude oil, which has harmful effects and undesirable. Out of these important r
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