9003-07-0 Usage
Chemical Properties
Different sources of media describe the Chemical Properties of 9003-07-0 differently. You can refer to the following data:
1. Translucent, white solid.Tensile strength 5000 psi, flexural
strength 7000 psi, usable up to 121C. Insoluble
in cold organic solvents; softened by hot solvents.
Maintains strength after repeated flexing. Degraded
by heat and light unless protected by antioxidants.
Readily colored; good electrical resistance; low
water absorption and moisture permeability; poor
impact strength below ?9.4C; not attacked by fungi
or bacteria; resists strong acids and alkalies up to
60C, but is attacked by chlorine, fuming nitric acid,
and other strong oxidizing agents. Combustible, but
slow-burning. Fair abrasion and good heat resis-
tance if properly modified. Can be chrome-plated,
injectionand blow-molded, and extruded.
2. Polypropylene is a low-density resin that offers a good balance
of thermal, chemical, and electrical properties, along with
moderate strength. Strength can be significantly increased by
using reinforcing agents such as glass fiber. Polypropylene has
limited heat resistance, but it can be used in applications that
must withstand boiling water or steam sterilization.
Polypropylenes can resist chemical attack and are unaffected
by aqueous solutions of inorganic salts or mineral
acids and bases, even at high temperatures. They are not
attacked by most organic chemicals, and there is no solvent
for these resins at room temperature. The resins are attacked,
however, by halogens, fuming nitric acid, other active oxidizing
agents, and by aromatic and chlorinated hydrocarbons
at high temperatures .
Polypropylene is translucent and autoclavable. Properties
can be improved by compounding with fillers, by blending with synthetic elastomers, and by copolymerizing with small
amounts of other monomers.
Uses
Different sources of media describe the Uses of 9003-07-0 differently. You can refer to the following data:
1. Polypropylene (PP) is a thermoplastic material used in a wide variety of applications including packaging, labeling, textiles, etc. Due to high processability and low cost, PP is one of the most extensively produced polymers, especially, for auto industry. Pristine PP is resistant to photo-oxidation and thermal oxidation at moderate temperatures. However, PP is sensitive to various external aging environments (such as heat, light, and radiation), and, hence, has a relatively low service temperature.When PP is exposed to high temperatures or to an irradiation environment, the tertiary hydrogen atoms present in PP chains are susceptible to be attacked by oxygen. It is well known that PP oxidation depends on both light and temperature in outdoor aging conditions. PP can also be photo-degraded because several molecular chains are affected in the wavelength range from 310 to 350 nm.
2. Used with ram- and screw-injection machines. For automotive, housewares, general molding products and multi- and monofiliment fiber.
3. General extrusion grade polymer.
4. Base polymer in hot melt adhesives and paper-laminating, extender and viscosity modifier in caulks and sealants and waterproofing agent in wire and cable applications.
5. Modifier for waxes to reduce blocking, scuffing and abrasion. Improves pigment dispersion in polypropylene films and fibers.
Definition
Different sources of media describe the Definition of 9003-07-0 differently. You can refer to the following data:
1. ChEBI: A polymer compose of repeating propane-1,2-diyl units.
2. polypropylene: Anisotactic polymer existing in bothlow and high formula-weight forms.The lower-formula-weight polymer ismade by passing propene at moderatepressure over a heated phosphoricacid catalyst spread on aninert material at 200°C. The reactionyields the trimer and tetramer. Thehigher-formula-weight polymer isproduced by passing propene into aninert solvent, heptane, which containsa trialkyl aluminium and a titaniumcompound. The product is amixture of isotactic and atacticpolypropene, the former being themajor constituent. Polypropene isused as a thermoplastic mouldingmaterial.
Preparation
High pressure, free radical processes of the type used to prepare polyethylene
are not satisfactory when applied to propylene and other tX-olefins bearing a
hydrogen atom on the carbon atom adjacent to the double bond. This is
attributed to extensive transfer of this hydrogen to propagating centres (R .):The resulting allyl radical is resonance stabilized and has a reduced tendency
to react with another monomer molecule.
Although the Phillips and Standard Oil processes can be used to prepare
polypropylene, the polymer yields tend to be low and it appears that these
processes have not been used for commercial production of polypropylene.
Until about 1980, polypropylene has been produced commercially only by
the use of Ziegler-Natta catalysts. Commonly a slurry process is used and is
carried out in much the same manner as described previously for the
preparation of polyethylene ). In the case of polypropylene, some atactic polymer is formed besides the required isotactic polymer;
but much of this atactic material is soluble in the diluent (commonly heptane)
so that the product isolated is largely isotactic polymer. Recently, there has
been a marked shift towards processes involving gas phase polymerization
and liquid phase polymerization. Few details of these newer processes have
been published. Gas phase processes resemble those described previously for
the preparation of polyethylene ) and swing plants are
now feasible. In liquid phase processes polymerization is conducted in liquid
propylene, typically at 2 MPa (20 atmospheres) and 55°C. Concurrently with
these developments, new catalyst systems have been introduced. These materials have very high activity and the reduced levels that are required make it
unnecessary to remove catalyst from the final polymer. Also, the new catalyst
systems lead to polypropylene with higher'proportions of isotactic polymer
and removal of atactic polymer is not necessary.
Production Methods
In PP production, propylene monomer is polymerized to
make the homopolymer by using a Ziegler–Natta type coordination
catalyst. This catalyst results from the reaction and
interaction of a transition metal compound and an organometallic
compound, usually an alkylaluminum compound.
Halide atoms are involved in most such catalyst systems .
Polypropylene can be made by solution, slurry (or solvent),
bulk (or liquid propylene), or gas-phase polymerization, or a
combination of these processes . The most widely used is
the slurry process; however, the current trend is toward the
gas-phase process. In the solution, slurry, and bulk processes,
the catalyst system is mixed with propylene and a hydrocarbon
diluent (usually hexane, heptane, or liquid propylene) in a
reactor. After polymerization, the reaction mixture enters a
flash tank where unreacted propylene is removed and
recycled. Propylene–ethylene copolymers [9010-79-1] can
be manufactured when ethylene is fed along with propylene to
the polymerization reactor or by adding ethylene and propylene
to a postpolymerization reactor that contains PP. This
mixture may then be purified to remove lowmolecular weight
and atactic fractions and washed to remove catalyst residues.
The polypropylene resin is then dried and pelletized. During this time, additivesmay be incorporated in the gas-phase
process; no liquid diluent is used .
General Description
Tan to white odorless solid. Less dense than water and insoluble in water. Hence floats on water.
Air & Water Reactions
Insoluble in water.
Reactivity Profile
Polypropylene reacts with chlorine, fuming nitric acid and other strong oxidizing agents.
Hazard
Questionable carcinogen.
Health Hazard
No apparent toxicity
Industrial uses
Polypropylene is similar in structure to polyethylene,but every other carbon atom has oneof its H2 atoms replaced by a CH2group.Although electrically similar to polyethylene,polypropylene can be made in thinner films, say 5μm as against about 25 μm for polyethylene.These films replace paper for impregnatedcapacitors, with reduced loss.
Safety Profile
Moderately toxic by
ingestion and intraperitoneal routes.
Questionable carcinogen. When heated to
decomposition it emits acrid smoke and
irritating fumes. Used in injection molding for auto parts, in bottle caps, and in
container closures.
Carcinogenicity
No data on the carcinogenicity
and mutagenicity of propylene are available for evaluation
by the working group.
Check Digit Verification of cas no
The CAS Registry Mumber 9003-07-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 3 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 9003-07:
(6*9)+(5*0)+(4*0)+(3*3)+(2*0)+(1*7)=70
70 % 10 = 0
So 9003-07-0 is a valid CAS Registry Number.
9003-07-0Relevant articles and documents
Glycerol Isopropyl Ethers: Direct Synthesis from Alcohols and Synthesis by the Reduction of Solketal
Samoilov, Vadim O.,Onishchenko, Maria O.,Ramazanov, Dzhamalutdin N.,Maximov, Anton L.
, p. 2839 - 2849 (2017)
The catalytic reduction of solketal ((2,2-dimethyl-1,3-dioxolan-4-yl)methanol) over bifunctional heterogeneous palladium catalysts is proposed as an alternative to the synthesis of glycerol isopropyl ethers by the etherification of glycerol. The direct synthesis of glycerol isopropyl ethers from isopropanol and glycerol requires severe conditions (T=130–150 °C, p(H2)=20–35 bar) and a large excess of isopropanol to reach a considerable yield. The main reaction products in the catalytic reduction of solketal are glycerol mono- and di-isopropyl ethers and solketal isopropyl ether. Solketal conversion over Al-HMS-supported palladium catalysts (T=120 °C and p(H2)=20 bar) affords a mixture of ethers with a high degree of conversion (87 %), 78 % selectivity, and excellent regioselectivity between isomeric ethers. Zeolite-BEA-supported palladium catalysts also exhibit high activity but much lower selectivity because of intense acetone aldol condensation. The effects of Si/Al ratios in BEA zeolites and Al-HMS aluminosilicates and the amounts of supported palladium (1 and 2 wt %) on the properties of the catalysts at different reaction temperatures and hydrogen pressures are considered.
A pronounce approach on the catalytic performance of mesoporous natural silica toward esterification of acetic acid with iso-amyl, benzyl, and cinnamyl alcohols
Said, Abd El-Aziz A.,Abd El-Wahab, Mohamed M. M.,El-Gamal, Nadia O.,Goda, Mohamed N.
, p. 257 - 268 (2021/12/14)
Catalytic esterification of acetic acid with iso-amyl, benzyl, and cinnamyl alcohols in the liquid phase over unmodified natural silica catalyst has been studied. The virgin and calcined catalysts were characterized by thermal analyses (Thermogravimetry (TG) and diffrential thermal analysis (DTA)), X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared (FTIR), scanning electron microscope (SEM), and N2 sorption analyses. The acidity of natural silica catalysts was investigated using isopropyl alcohol dehydration and chemisorption of pyridine and dimethyl pyridine. The results indicated that most of the acidic sites are of Br?nsted type and of intermediate strength. The effect of different parameters such as reaction time, molar ratio, catalyst dosage, and calcination temperature was studied. Natural silica catalyst exhibited excellent catalytic performance with a selectivity of 100% to acetate esters formation. The maximum yields of isoamyl, benzyl, and cinnamyl acetate esters obtained in the batch conditions were 80, 81, and 83%, respectively. Whereas on adopting a simple distillation technique, these yields were successfully improved to higher values of 97, 98, and 90%, respectively. Experimental results manifested that the reaction followed Langmuir–Hinshelwood mechanism. Finally, the catalyst could be completely recycled without loss of its activity after four cycles of the esterification reactions.
Investigation on the Thermal Cracking and Interaction of Binary Mixture of N-Decane and Cyclohexane
Chen, Xuejiao,Pang, Weiqiang,Wang, Bo,Zhang, Ziduan,Zhou, Lingxiao,Zhu, Quan
, (2022/03/02)
Abstract: The investigation about the thermal cracking performance and interaction of different components in hydrocarbon fuels is of great significance for optimizing the formulation of high-performance hydrocarbon fuels. In this work, thermal cracking of n-decane, cyclohexane and their binary mixture were studied in a tubular reactor under different temperatures and pressures. The gas and liquid products were analyzed in detail with different gas chromatography. The main gas products of pure n-decane and cyclohexane are similar, and there is a certain difference in the main liquid products. For binary mixture, the overall conversion rate and gas yield are lower than their theoretical value. The cracking conversion rate of n-decane in binary mixture is lower than that in pure n-decane, but the opposite change occurs for cyclohexane, and the effect become more obvious as the increase of the reaction pressure. These experimental phenomena can be explained by bond dissociation energy and free radical reaction mechanism. The pressure affects the free radical reaction path, and high pressure is more conducive to bimolecular hydrogen abstraction reaction, which will lead to different product content. A law of interaction between the n-decane and cyclohexane was observed according to the experimental results. [Figure not available: see fulltext.]
