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HENAN SUNLAKE ENTERPRISE CORPORATIONCAS NO:7772-98-7 Sodium thiosulfate//www.lookchem.com/300w/2010/0626/7772-98-7.jpg
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CAS NO:7772-98-7 Sodium thiosulfate CAS NO.7772-98-7

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1 Kilogram
Purity:
98%
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China Main Port
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Keywords

  • Sodium thiosulfate
  • 7772-98-7
  • Na2O3S2

Quick Details

  • ProName: CAS NO:7772-98-7 Sodium thiosulfate
  • CasNo: 7772-98-7
  • Molecular Formula: Na2O3S2
  • Appearance: powder
  • Application: 7772-98-7
  • DeliveryTime: within 3-7 days
  • PackAge: as requested
  • Port: China Main Port
  • ProductionCapacity: 300 Kilogram/Month
  • Purity: 98%
  • Storage: store in cool, dry place
  • Transportation: by sea or by air
  • LimitNum: 1 Kilogram

Superiority

sodium thiosulfate chemical properties
melting point 48°c
boiling point 100°c
density 1.01 g/ml at 25 °c
storage temp. 2-8°c
sensitive hygroscopic
merck 14,8694
stability: stable. incompatible with strong acids, strong oxidizing agents, iodine, mercury.
cas database reference 7772-98-7(cas database reference)
epa substance registry system thiosulfuric acid (h2s2o3), disodium salt(7772-98-7)
safety information
hazard codes xi
risk statements 36/37/38
safety statements 24/25-23-36-26
wgk germany 1
rtecs xn6476000
f 3
hazardous substances data 7772-98-7(hazardous substances data)
msds information
provider language
sodium hyposulfite english
acros english
sigmaaldrich english
alfa english
sodium thiosulfate usage and synthesis
chemical materials sodium thiosulfate is a commonly used chemical material, as the fixing agent in photography, film and printing plate-making industry, as a reducing agent used in tanning. it is used as a bleaching agent for removing residual and a mordant in the paper and textile industries, as antidotes of cyanide poisoning in medicine, as dechlorination agent and fungicides of drinking water and wastewater in water treatment, as a copper corrosion inhibitor of circulating cooling water and a deoxidizer of boiler water systems. it is also used for cyanide wastewater treatment. soda ash and sulfur are generally used as raw materials in industry, soda ash reacts with sulfur dioxide produced by the combustion of sulfur to produce sodium sulfite, then add sulfur for boiling reactions, and then filter, bleach, concentrate and crystallize, etc, can obtain sodium thiosulfate pentahydrate. other production waste containing sodium sulfide, sodium sulfite, sulfur and sodium hydroxide can also be used, after appropriate treatment to get the product.
the above information is edited by yan yanyong of chemicalbook.
physical properties sodium thiosulfate has two forms as anhydrous sodium thiosulfate (na2s2o3) and sodium thiosulfate pentahydrate (na2s2o3 · 5h2o), the latter is also known as soda and hyperion. a molecular weight is 158.11 and 248.18 respectively. anhydrous sodium thiosulfate is an opaque crystalline powder. the relative density is 1.667. it is odorless, salty taste, soluble in water, insoluble in ethanol. it decomposes in acidic solution, has a strong reduction, easily absorbs moisture. sodium thiosulfate pentahydrate is odorless, colorless and transparent monoclinic crystals or granules. the relative density is 1.685. the melting point is 48 ℃. it loses all crystal water at 100 ℃, and decomposes above 100 ℃. it is easily weathered in dry and hot air, slightly deliquescence in the hot and humid air. it is soluble in water and turpentine, insoluble in ethanol, decomposes in case of strong acid. prolonged exposure in the air, it is easily oxidated and carbonized by oxygen and carbon dioxide.
chemical properties with reductibility, sodium thiosulfate is a medium strength reducing agent, for example, can be oxidated by chlorine:
na2s2o3 + 4cl2 + 5h2o = na2so4 + h2so4 + 8hcl, this reaction is used in textile and paper industries, and sodium thiosulfate is used as dechlorination agent. again, it can be oxidized to sodium tetrathionate by iodine: na2s2o3 + i2 = na2s4o6 + 2nal, this reaction is used in analytical chemistry for quantitative determination of iodine.
it is also used in tanning, extracts silver from the ore and so on. since there are different oxidation states of sulfur in sodium thiosulfate molecule, it is stable in alkaline medium, unstable an acidic medium, oxidation-reduction reaction occurs when acidification, separate out sulfur:
na2s2o3 + h2so4 = na2so4 + h2s2o3 h2s2o3 = h2so3 + s h2so3 = h2o + s02.
with coordination, thiosulfate ions can form stable complexes with certain metal ions, for example, silver bromide can be dissolved in an aqueous solution of hypo to produce stable [ag (s2o3) 2] 3- complex ions: agbr + 2na2s2o3 = na3 [ag (s2o3) 2] + nabr, so it is commonly used as a photographic fixing bath. sodium sulfite and sulfur are boiled, and then filtration, evaporation, crystallization to prepare sodium thiosulfate.
antidote sodium thiosulfate is a sulfur donating agent, has active sulfur atoms. through a sulfur transferase, it can combine with cn- free or associated with methemoglobincombine of the body to make it into a small toxicity thiocyanate, excreted in the urine and detoxification.
sodium thiosulfate in the tissues of the body, with the participation of the enzyme, reacts with cyanide, since free cn- or conbines with cn- chemical group associated with methemoglobin, it turns into small toxicity thiocyanate, excreted with the urine and detoxification. this product reacts with arsenic, mercury compound to form a harmless, non-toxic sulfide, reacts with iodide to prepare new iodide and detoxification. mainly used for rescuing cyanide poisoning, can also be used for rescuing bromine blue poisoning, as well as rescuing poisoning of arsenic, mercury, lead, bismuth, iodine and so on, but also used for anti-allergy, topical treatment of tinea versicolor, scabies blisters, itchy skin disease, chronic urticaria.
cyanide poisoning: nitrous acid compounds or methylene blue high methemoglobin forming agent are used to make the body produce enough methemoglobin, which combines with the free cyanide ions in the blood or cyanide ions associated with cytochrome oxidase to form cyanide methemoglobin, and restore cytochrome cyanide enzyme activity. but cyanide methemoglobin gradually releases cyanide ions in minutes, so that symptoms reappear. if sodium thiosulfate is given at the same time, under sulfur transfer enzymes, it can combine with cn- free or associated with methemoglobincombine of the body to make it into a nontoxic thiocyanate, excreted in the urine and detoxification.
[usage and dosage] 1. cyanide poisoning: upon completion of the injection of sodium nitrite, then with the same needle to conduct intravenous injection of 50% sodium thiosulfate solution 50ml slowly with a speed of 2.5 ~ 5.0g / min. if necessary, one hour after injection and then inject repeatedly a half volume or full amount. 2. poisoning of arsenic, bismuth, iodine, mercury, lead and so on: each adult each 0.5 ~ 1g; children each 10 ~ 20mg / kg. 3. desensitization, with a 5% solution 5 ~ 10ml, one time a day.
chemical properties it is colorless monoclinic crystal or white crystalline powder, odorless, salty ignorant. the relative density is 1.667. soluble in water, the solubility is 231 g / 100 ml of water at 100 ℃. insoluble in alcohol. deliquescence easily in air. with a strong reductibility, decomposition in acidic solution.
uses 1. used in manufacture of the fixing powder and preparation of the photographic industry fixer, desiccant. used as a reducing agent of dichromate in leather tanning industry.
2. commonly known as da suda, sodium thiosulfate is an important inorganic chemical raw material. it can be used in the synthesis of pesticides bisultap, shachongdan, cartap and so on.
3. used as analytical reagents, mordant and fixer.
4. used as new insecticides, with stomach poisoning, uptake and contact action effects, it can prevent and treat rice yellow stem borer, stem borer, leaf roller, rice thrips and vegetables, fruit pests.
5. with uptake and strong contact, stomach poisoning effects, it can prevent and treat various rice pests and vegetables, fruit pests.
6. used as the chlorine removal agent for pulp and cotton fabric bleached, as chelating agents, anti-oxidants in the food industry, as detergents, disinfectants in the pharmaceutical industry.
7. used as chelating agents, antioxidants, anti-browning agent, as the dechlorination agent of chlortetracycline hydrochloride (or chlortetracycline) chilled with ice, dechlorination reaction is as follows:
more chlorine content will cause side reactions of free sulfur, so only used for very dilute concentrations of chlorine.
used as salt chelating agent, limited content is 0.1% or less.
production method 1. it is generated by heat of a solution of sodium sulfite and sulfur powder.
2. there are more synthesis methods of sodium thiosulfate, such as sodium sulfite method, sodium sulfide method and so on.
sodium sulfite method
soda solution reacts with sulfur dioxide gas, and caustic soda was added, adding sodium sulfide to remove impurities by filtration, and then sulfur powder was dissolved in a hot solution of sodium sulfite to react, filter, remove impurities, and then filter repeatedly, add caustic alkali to process, through concentration, filtration, crystallization, centrifugal dewatering, screening, to obtain the finished product of sodium thiosulfate. reaction equation: na2co3 + so2 = na2so3 + co2 ↑
na2so3 + s + 5h2o = na2s2o3 · 5h20
sodium sulfide method
a raw material liquid formulated from sodium sulfide evaporation residue, barium sulfide wastewater (containing sodium carbonate and sodium sulfide) reacts with sulfur dioxide, sulfur powder was added after clarification, heated to react, evaporation, cooling crystallization, washing, separation, screening to obtain sulfur thiosulfate products. reaction equation: 2na2s + na2co3 + 4so2 = 3na2s2o3 + co2 ↑
2na2s + 3na2co3 + 6so2 + 2s = 5na2s2o3 + 3co2 ↑
3. dehydration method is that heat sodium thiosulfate pentahydrate crystalline indirect with steam, it dissolves into itself crystal water, concentration, centrifugal dewatering, drying, screening, to obtain the finished product of anhydrous sodium thiosulfate.
na2s2o3 · 5h20 → na2s2o3 + 5h2o
chemical properties white powder
usage sodium thiosulfate is used primarily as a medicament against cyanide poisoning, able to convert cyanide into thiocyanate, a reaction which is catalyzed by the enzyme rhodanese. antioxidant.
sodium thiosulfate preparation products and raw materials
preparation products 1-tert-butyl-3-(trifluoromethyl)-1h-pyrazole-4-carboxylic acid-->3-nitrophenylmethanesulfonyl chloride-->1-(3-amino-2-chloro-pyridin-4-yl)-ethanone-->4-(n,n-dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole-->bromoform-->4-(hydroxymethyl)picolinitrile-->(4-chloro-phenyl)-methanesulfonyl chloride-->1-(3-amino-pyridin-4-yl)-ethanone-->4-fluorothiophenol-->2-bromo-4-pyridinecarboxaldehyde-->cartap-->s-methyl-s-(2-thiazyl) sulfoximine-->s-methyl-s-(4-hydroxyphenyl) sulfoximine-->s-methyl-s-(5-methylfuran-2-yl) sulfoximine-->1-adamantanol-->1-tert-butyl-4-bromo-3-(trifluoromethyl)-1h-pyrazole-->s-methyl-s-(4-methoxyphenyl) sulfoximine-->s-methyl-s-(4-fluorophenyl) sulfoximine-->4-bromo-1-methyl-3-(trifluoromethyl)-1h-pyrazole-->s-ethyl-s-phenyl sulfoximine-->s-methyl-s-(4-methylphenyl) sulfoximine-->s-methyl-s-(4-chlorophenyl) sulfoximine-->s-methyl-s-(2-fluoroyphenyl) sulfoximine-->s-methyl-s-(3-acetamidophenyl) sulfoximine-->3-chloro-4-iodonitrobenzene-->4-[4-(bromomethyl)phenyl]-1,2,3-thiadiazole-->4-(chlorosulfonyl)-7-fluoro-2,1,3-benzoxadiazole-->4-bromo-2-fluorobenzonitrile-->1-iodonaphthalene-->4-fluoro-2,1,3-benzoxadiazole-->3-bromo-1-benzothiophene-->2,5-dibromo-3-nitropyridine-->3-iodopyridine-->3,5-dibromo-2-hydroxy-4-methoxybenzaldehyde-->iodocyclohexane-->dimethyl bromomalonate-->3-fluoro-2-iodopyridine-4-carboxylic acid-->1,3-dibromo-2-propanol-->allicin
raw materials sodium hydroxide-->hydrochloric acid-->sulfuric acid -->sodium carbonate-->sulfur-->sodium sulfite-->sodium sulfide-->activated carbon-->sulfur dioxide-->sulphur-->sodium thiosulfate pentahydrate-->vanadium pentoxide -->potassium sodium tartrate -->barium sulfide-->sulphur black 1

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