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Ethylbenzene 99% is an aromatic hydrocarbon, CAS 100-41-4, The chemical formula is C8H10. Colorless transparent liquid with an aromatic odor. Insoluble in water, but miscible with most organic solvents such as ethanol, ether, and benzene. Mainly used for producing styrene, and then producing styrene homopolymers and copolymers (ABS, AS, etc.) with styrene as the main component. A small amount of ethylbenzene is mainly used for organic synthesis to produce styrene, which is then used to produce styrene homopolymers and copolymers (ABS, AS, etc.) with styrene as the main component. A small amount of ethylbenzene is used in the organic synthesis industry for the production of intermediates such as acetophenone, ethylanthraquinone, p-nitroacetophenone, methylphenylketone, etc.
Used as an intermediate for the synthesis of erythromycin and chloramphenicol in medicine, as well as in fragrances. In addition, it can also be used as a solvent. Used for ICP-AES AAS,AFS,ICP-MS, Ion chromatography, etc. Standard solution for titration analysis. Calibration instruments and equipment; Evaluation method; Work standards; Quality assurance/quality control; other. Industry. Used in medicine as an intermediate for synthesizing erythromycin and chloramphenicol, and also as a fragrance. In addition, it can also be used as a solvent.
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Chemical Formula |
C8H10 |
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Exact Mass |
106 |
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Molecular Weight |
106 |
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m/z |
106 (100.0%), 107 (8.7%) |
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Elemental Analysis |
C, 90.51; H, 9.49 |
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Ethylbenzene is an important organic compound with the chemical formula C ₈ H ₁₀, belonging to aromatic hydrocarbons. It is a colorless, highly flammable liquid with an aromatic odor, insoluble in water but miscible with most organic solvents such as ethanol and ether. It occupies an important position in the petrochemical industry and has a wide range of applications, involving multiple fields such as plastics, rubber, medicine, spices, solvents, etc.
Plastic industry: Ethylbenzene, the cornerstone of styrene production, is mainly used as a raw material for the production of styrene. Styrene is an important organic chemical raw material that can be polymerized to produce various plastics, such as polystyrene (PS), acrylonitrile butadiene styrene copolymer (ABS), styrene acrylonitrile copolymer (SAN), etc. These plastics are widely used in various fields such as packaging, construction, electronics, automobiles, and home appliances due to their excellent physical and processing properties.
Polystyrene (PS): Polystyrene is a homopolymer of styrene, characterized by high transparency, good rigidity, and ease of processing.
It is commonly used to manufacture disposable tableware, toys, daily necessities, optical instruments, etc.
ABS resin: ABS resin is a ternary copolymer of acrylonitrile, butadiene, and styrene, which combines the advantages of the three components and has high strength, high toughness, good processability, and surface glossiness. It is widely used in fields such as automotive parts, electronic and electrical casings, pipelines, etc.
SAN resin: SAN resin is a copolymer of styrene and acrylonitrile, which has excellent heat resistance, chemical corrosion resistance, and transparency. It is commonly used in the manufacture of tableware, medical equipment, optical instruments, etc.
Rubber Industry: Key Components of Synthetic Rubber
It also plays an important role in the rubber industry. Through catalytic dehydrogenation reaction, it can be converted into styrene, which is a key raw material for the production of synthetic rubber such as styrene butadiene rubber (SBR) and styrene butadiene styrene block copolymer (SBS).
Styrene butadiene rubber (SBR): Styrene butadiene rubber is a copolymer of styrene and butadiene, with good wear resistance, aging resistance and processing properties. It is the main raw material for rubber products such as tires, conveyor belts, and seals.
SBS resin: SBS resin is a thermoplastic elastomer with excellent elasticity, wear resistance, and weather resistance. It is widely used in the fields of shoe materials, adhesives, asphalt modifiers, etc.
Pharmaceutical industry: an important intermediate for synthesizing drugs
Used as an intermediate for various drugs in the pharmaceutical industry, it plays an important role in ensuring human health. For example, it can be used to synthesize drugs such as streptomycin and chloramphenicol.
Oxytetracycline: Oxytetracycline is a broad-spectrum antibiotic that has inhibitory effects on various bacteria. It is commonly used to treat respiratory tract infections, urinary system infections, and other diseases.
Chloramphenicol: Chloramphenicol is an efficient broad-spectrum antibiotic with strong inhibitory effects on both Gram positive and Gram negative bacteria. It is commonly used to treat diseases such as typhoid fever, paratyphoid fever, meningitis, etc.
Spice Industry: Raw Materials for Synthetic Spices
It also has certain applications in the spice industry. It can be used as the raw material for the synthesis of certain fragrances to produce compounds with specific fragrance through chemical reaction, and can be used to prepare essence for perfume, cosmetics, detergents and other products. For example, acetophenone can be generated through oxidation reaction, which is a compound with sweet and floral aromas, commonly used as a fragrance fixative for spices.
Solvent field: various excellent solvents for organic synthesis
Has good solubility and can dissolve various organic compounds such as chlorinated rubber, natural rubber, butyl rubber, chloroprene rubber, nitrile rubber, ethyl cellulose, epoxy resin, etc. Therefore, it is widely used as a solvent and plays an important role in multiple industrial fields.
Paint and coatings: As solvents, they can improve the flowability and drying performance of paints and coatings, enhance the adhesion and glossiness of coatings. In industries such as automotive, construction, and furniture, it is an indispensable solvent component.
Ink: In ink manufacturing, as a solvent, it can adjust the viscosity and drying speed of ink to improve printing quality. Whether it's newspapers, magazines, or packaging materials, they all play important roles.
Adhesive: As a solvent for adhesive, it can improve the fluidity and permeability of the adhesive, and enhance the bonding strength. It is one of the commonly used solvents in industries such as wood processing, packaging, and shoemaking.
Other applications: It can also be used to manufacture dry cleaning agents, paint thinners, metal cleaning agents, etc. In addition, it can also be used as a fuel additive to increase the octane rating of gasoline.
Organic synthesis industry: raw materials for producing various intermediates
It is also widely used in the organic synthesis industry. It can be used as a raw material for producing various intermediates and synthesizing various organic compounds. For example:
Acetophenone: Acetophenone can be generated through oxidation reaction, which is an important organic synthetic raw material used in the production of fragrances, dyes, pharmaceutical intermediates, etc.
Ethylanthraquinone: Ethylanthraquinone can be generated by reacting with anthraquinone, which is an important photosensitizer that can be used in photochemical and photocatalytic reactions.
P-nitroacetophenone: Through nitration reaction, p-nitroacetophenone can be generated, which is an important pharmaceutical intermediate that can be used to synthesize various drugs.
Methyl phenyl ketone: Reacting with formaldehyde can produce methyl phenyl ketone, which is an important organic synthetic raw material and can be used as an additive in the production of plastics, rubber and other products.
Other fields: Exploration of emerging applications
With the advancement of science and technology, the application fields are constantly expanding. For example:
In the field of new energy, it can be used as fuel or additive for fuel cells to improve their performance and efficiency.
In the field of environmental protection, it can be used to treat organic matter in wastewater, convert organic matter into harmless substances through chemical reactions, and reduce pollution to the environment.
In the field of new materials, ethylbenzene can be used as a raw material for the synthesis of certain new materials, such as high-performance polymers, nanomaterials, etc., providing strong support for the development of new materials.
1. The liquid phase alkylation method usually uses aluminum trichloride as catalyst to make ethylene react with benzene to produce ethylbenzene under normal pressure and 85-90 ℃. The side reaction is that ethylbenzene is further alkylated by ethylene to produce polyethylbenzene. In industry, the conversion rate of benzene is limited to 52-55%, and a high benzene ethylene molar ratio (generally about 2) is used to prevent the formation of more diethylbenzene and diethylbenzene. The average yield of ethylbenzene is 94-96%.
2. The gas phase alkylation method was originally used to produce ethylbenzene from ethylene and excess benzene by gas phase alkylation reaction at 300 ℃ and 4-6 MPa with phosphoric acid diatomite and silica gel catalyst. The catalyst used cannot dealkylize the ethylbenzene, so the ethylbenzene cannot be treated. Although the production of polyethylbenzene is reduced by increasing the proportion of benzene, the distillation cost of circulating benzene is increased.
3. Aromatics obtained from catalytic reforming of C8 aromatics to ethylbenzene. After separation and removal of benzene and toluene, the boiling points of each component of the mixed xylene fraction are very close. Separation of ethylbenzene by distillation requires 300-400 trays with a reflux ratio of 75. In addition, ethylbenzene can also be separated by adsorption and chromatography. Since the separation of ethylbenzene from C8 aromatics can no longer compete with benzene alkylation ethylbenzene economically, and the new generation of noble metal isomerization catalyst can effectively convert ethylbenzene to xylene, the importance of ethylbenzene separation is greatly reduced.
It can dissolve chlorinated rubber, natural rubber, butyl rubber, neoprene, nitrile rubber, ethyl cellulose, epoxy resin, DDT, grease, paraffin oil, wax, etc. Cellulose acetate, cellulose acetate butyrate, cellulose nitrate, cellulose triacetate, polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, etc. are insoluble. Non corrosive to metals. It is relatively stable to acid and alkali. Oxidation generates acetophenone, and dehydrogenation generates styrene. Nitrification α- Nitro group- α Phenylethane. The chlorination reaction produces 1-chloro-1-phenylethane. Under the catalysis of platinum, silica alumina, isomerization reaction takes place to produce xylene.
Stable.
Prohibited strong oxidants, acids, halogens, etc.
Polymerization hazard No polymerization.
Ethylbenzene activates the benzene ring because there is ethyl attached to the benzene ring, which is more prone to chemical reaction than benzene. Ethylbenzene can be nitrated or sulfonated. Ethylbenzene reacts with potassium permanganate to produce benzoic acid. Under the catalysis of platinum, silica alumina, isomerization reaction takes place to produce xylene.
The production methods of ethylbenzene mainly include catalytic synthesis and free radical chain reaction. Among them, catalytic synthesis is the most commonly used production method in industry.
(1) Catalytic Synthesis Method
Principle:
Under the action of a catalyst, benzene and ethylene undergo an addition reaction to produce ethylbenzene.
Process:
Mix benzene and ethylene in a certain proportion, add catalysts (such as aluminum trichloride, boron trifluoride, etc.), and react at appropriate temperature and pressure. After the reaction is complete, ethylbenzene product is obtained through separation and purification steps.
Advantages:
The catalytic synthesis method has the advantages of mild reaction conditions, high product purity, and high yield. In addition, this method can also achieve continuous production and improve production efficiency.
(2) Free Radical Chain Reaction Method
Principle:
Under the action of an initiator, benzene and ethylene undergo a free radical chain reaction to produce ethylbenzene.
Process:
Mix benzene and ethylene in a certain proportion, add initiators (such as benzoyl peroxide, azobisisobutyronitrile, etc.), and react at appropriate temperature and pressure. After the reaction is complete, ethylbenzene product is obtained through separation and purification steps.
Advantages:
The free radical chain reaction method has the advantages of fast reaction speed and easy operation. However, the product purity and yield of this method are relatively low, and it requires a large amount of initiator consumption, so its industrial application is limited.
FAQ
What is ethylbenzene used for?
Ethylbenzene is used primarily in the production of styrene and synthetic polymers. It is used as a solvent; a constituent of asphalt and naphtha; and in synthetic rubber, fuels, paints, inks, carpet glues, varnishes, tobacco products, and insecticides. It is a component of automotive and aviation fuels.
Is ethylbenzene harmful to humans?
The International Agency for Research on Cancer (IARC) has determined that ethylbenzene is a possible human carcinogen.
What is the common name of ethylbenzene?
Chemical name: Ethylbenzene Synonyms: Phenylethane, EB, Ethylbenzol Relative molecular mass: 106.16 CAS registry number: 100-41-4 RTECS registry number: DA 07000000 EEC number: 601-023-00-4 2.2 Physical and chemical properties Some physical and chemical properties of ethylbenzene are given in Table 1.
Is ethylbenzene the same as benzene?
Ethylbenzene [ěth'el'běn'zēn'] is a clear, flammable liquid with an odor that is similar to gasoline. Ethylbenzene is commercially produced from benzene and ethylene in industrial plants, and a minor amount is isolated by purifying petroleum by-product streams.
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