Zhishang Chemical

Ethylbenzene Sigma CAS 100-41-4

Molecular Formula: C8H10

Formula Weight: 106.17

ZSpharmac: Ethylbenzene Sigma Supplement

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Product Name: Ethylbenzene Sigma
CAS No: 100-41-4
Purity: 99%

Basic Info

Product Name:Ethylbenzene Sigma
Other Names:Ethylbenzene
CAS:100-41-4
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Organic Chemical Raw Materials
Appearance:Colorless Liquid
EINECS No.:200-467-2
Storage:Store Below +30°C.
Provide:Ethylbenzene Sigma MSDS;
Ethylbenzene Sigma COA

What is Ethylbenzene Sigma?

Ethylbenzene Sigma is insoluble in water, a colorless flammable liquid, soluble in alcohol, benzene and ether. For styrene production, synthesis of polymers, also used as solvent or diluent. This product is of low toxicity. It can be absorbed through the respiratory tract, digestive tract and skin. Acute inhalation of 4.92g/m3 to 9.84g/m3 can cause acute poisoning, eye and nose irritation, fatigue, dizziness and chest tightness. At 24.6g/m3, it is unbearable. In severe cases, nausea, vomiting, staggering gait, coma, encephalopathy and toxic liver disease may occur. Direct inhalation of this product can cause pulmonary edema or chemical pneumonia. Long-term exposure to 492mg/m3 environment for 8 hours a day can cause chronic effects, mainly causing neurasthenia syndrome, respiratory irritation symptoms, and leukopenia. Frequent direct contact with the skin can cause roughness, chapping and peeling. During the production process, pay attention to the protection of respiratory tract and the protection of hand and face skin contact.

Ethylbenzene Sigma Properties:

Melting point −95 °C(lit.)
Boiling point 136 °C(lit.)
density 0.867 g/mL at 25 °C(lit.)
vapor density 3.7 (vs air)
vapor pressure 28.69 psi ( 55 °C)
refractive index n20/D 1.495(lit.)
Fp 72 °F
storage temp. Store below +30°C.
solubility 0.2g/l
form Liquid
color Colorless
OdorAromatic.
Relative polarity0.117
Odor Threshold0.17ppm
explosive limit1.0-7.8%(V)
Water Solubility 0.0206 g/100 mL

 

Ethylbenzene Sigma Uses

  1. Ethylbenzene Sigma is used as a raw material for styrene, also in pharmaceuticals and other organic synthesis.
  2. Ethylbenzene Sigma is mostly made use of for the manufacturing of styrene, which in turn creates styrene homopolymers as well as styrene-based copolymers (ABDOMINALS, AS, and so on). A percentage of ethylbenzene is utilized in the organic synthesis sector, such as the production of intermediates such as acetophenone, ethyl anthraquinone, p-nitroacetophenone, and also methyl phenyl ketone. In medicine, it is used as the intermediate of synthomycin as well as chloramphenicol. Also made use of for flavors. Furthermore, it can likewise be used as a solvent.
  3. Ethylbenzene Sigma is used as chromatographic standard material and solvent, and also in organic synthesis.

Ethylbenzene Sigma Production Method

Industrially, Ethylbenzene Sigma is acquired by the response of benzene and ethylene in the presence of a driver, as well as can likewise be separated from the C8 fraction of naphtha reformate. Regarding 90% of ethylbenzene in industry is currently produced by alkylation of benzene. 1. The liquid-phase alkylation technique usually uses aluminum trichloride as a driver under typical stress and also 85-90 ° C to respond ethylene with benzene to produce Ethylbenzene Sigma. A side reaction is that Ethylbenzene Sigma is further alkylated by ethylene to generate polyethylbenzene. In industry, the conversion price of benzene is limited to 52-55%, and also a high benzene-ethylene molar ratio (usually about 2) is utilized to avoid the formation of more diethylbenzene and polyethylbenzene. The average return of ethylbenzene was 94-96%. 2. The gas-phase alkylation approach is originally a gas-phase alkylation reaction of ethylene and excess benzene under the action of phosphoric acid-diatomaceous earth-alumina-silica gel catalyst at 300 ° C as well as 4-6 MPa to prepare ethylbenzene. Polyethylbenzene can not be treated since the catalyst made use of can not perform the dealkylation of polyethylbenzene. Although the manufacturing of polyethylbenzene is reduced by enhancing the percentage of benzene, the purification expense of flowing benzene is enhanced. 3. The aromatic hydrocarbons acquired by the splitting up of C8 fragrant hydrocarbons to the catalytic changing of ethylbenzene. After splitting up and also removal of benzene and toluene, the boiling factors of each element of the mixed xylene portion are really close. 300-400 trays are needed to divide Ethylbenzene Sigma by rectification, as well as the reflux ratio is 75. Furthermore, adsorption separation and also chromatography can also be made use of to divide ethylbenzene. The relevance of ethylbenzene splitting up is greatly improved by the reality that the separation of ethylbenzene from C8 aromatics is no more financially competitive with the alkylation of ethylbenzene with benzene, as well as the brand-new generation of rare-earth element isomerization drivers can effectively transform ethylbenzene to xylenes decrease.

Ethylbenzene Sigmase Synthesis Process

Method one AlCl3 method, AlCl3 method adopts the typical Friedel-C rafts process, using AlCl3 complex as catalyst. The by-products of the reaction are mainly diethylbenzene and polyethylbenzene, and there are traditional AlCl3 method and improved AlCl3 method. In the traditional AlCl3 method, the reactants and the catalyst in the reactor form a three-phase, liquid aromatics, gaseous ethylene and liquid catalyst complexes. The catalyst complex is red and immiscible with liquid aromatics. During the reaction, ethylene is bubbled into a reactor containing two liquid phases to disperse and mix them. The molar ratio of ethylene and benzene is 0.3 to 0.35, and the reaction is carried out below 130°C and normal pressure. The conversion of ethylene is close to 100%, the yield of ethylbenzene is higher, and the amount of recycled benzene and ethylbenzene is small; the alkylation of benzene with ethylene and the transalkylation of polyethylbenzene can be carried out in the same reactor Finish. The disadvantage is that the reaction medium is highly corrosive, the equipment cost and maintenance cost are high, and the organic phase of the reaction product is washed with water and alkali to produce a large amount of waste water containing aluminum hydroxide slurry, and the waste catalyst has caused serious environmental pollution. The improved AlCl3 method, because the traditional AlCl3 method has problems such as serious pollution and corrosion and two liquid phases in the reactor, in 1974, Monsanto/Lummus company proposed the improved AlCl3 method, which makes the amount of AlCl3 catalyst larger. Reduced (only 1/3 of the traditional method), thus reducing the amount of waste catalyst treatment, and the feed ethylene concentration can range from 15% to 100%. By controlling the feeding of ethylene, the amount of AlCl3 catalyst is reduced to within the solubility range, so that the reaction can be carried out in a homogeneous liquid phase, and the yield of ethylbenzene is improved. 8。 The reaction temperature is 160 ~ 180 ° C, the pressure is 0. 6 ~ 0. 8MPa, and the molar ratio of ethylene to benzene is 0.8. When using dilute ethylene as the raw material, the H2S, O2, CO2 and H2O in the raw gas need to be purified to a mass fraction of about 5×10-6. Due to the obvious effect of this method in reducing costs, many traditional AlCl3 method devices have been transformed and expanded by the method of Mon san to/Lummus. However, this method only alleviates the problems of equipment corrosion and environmental pollution, and has not fundamentally solved it. The modified AlCl3 process is similar to the traditional AlCl3 process, the difference is that the alkylation and transalkylation reactions are carried out in two reactors. In the modified AlCl3 process, only dry benzene (instead of benzene and recycled polyethylbenzene) is continuously fed with ethylene and catalyst to the alkylation reaction, while the products of the alkylation reaction are recycled from the rectification column After the polyethylbenzene is mixed, the transalkylation reaction is carried out in another reactor. Method 2 Alkar method, Alkar method was developed by UOP in 1958 and industrialized in 1960, using BF3 supported on Al2O3 as a catalyst. The alkylation reaction can be carried out with ethylene with a concentration as low as 8% to 10% (mass fraction), so the treated FCC dry gas or coke oven tail gas can be used as the raw material. The reaction was carried out at 100-150°C and 2.5-3.5MPa, and the molar ratio of ethylene and benzene was controlled between 0.15-0.2. The transalkylation reaction was carried out in a separate reactor at a temperature of 180-230°C. The materials from the two reactors are combined into the purification system. The ethylbenzene purity of the finished product can reach 99.9%. The main advantages of this method are high catalyst activity, long life, good ethylbenzene selectivity, no corrosion and no pollution, short process, low energy consumption, and can be used for comprehensive utilization of low-concentration ethylene. The disadvantage is that the catalyst preparation conditions are harsh, the cost is more expensive, and it is easy to be poisoned and deactivated. The raw materials must be purified before the reaction, and the content of impurities such as H2S, CO2 and H2O is required to be less than 1×10-6. Method 3 Mobil-Badger gas-phase method, in 1976, Mobil and Badger jointly developed a gas-phase method for producing ethylbenzene with high-silicon ZSM-5 zeolite as a catalyst, the alkylation of benzene and ethylene, and diethylbenzene and All benzene transalkylation reactions have strong activity and good selectivity. The alkylation reaction is carried out under the gas phase conditions of high temperature and medium pressure, the reaction temperature is 370~430℃, the reaction pressure is 1.42~2.84 MPa, and the mass space velocity of ethylene is 3~5/h. The process can use concentrated ethylene as the raw material (in 1980, it was industrialized in the United States, with an annual output of 473,000 tons of ethylbenzene, the process flow is shown in Figure 2, and the mixed gas of dilute ethylene can also be used as the raw material, but in the treatment of FCC dry gas or When coke oven exhaust is used as a raw material, the content of impurities such as propylene, H2S, O2 and H2O in the raw material gas is extremely strict, and the mass fractions are all 10-6 (wherein sulfide≯10×10-6, H2O≯10 ×10-6), the raw material needs to be strictly refined, which can prolong the single-pass life of the catalyst, but the investment and energy consumption of the unit are relatively high (the unit consumption of benzene is 0.749t/tEB, and the unit consumption of ethylene is 0.168t/tEB). Completed in 19771 . 60,000 t/a ethylbenzene, the use of refinery gas as raw material to produce ethylbenzene industrial test equipment, and in 1991 in Stan low, England, built and put into operation the first large-scale industrial equipment of 160,000 t/a ethylbenzene. There is no environmental pollution and equipment corrosion problems in the production process. Although the catalyst is easy to coke and deactivate, it can be regenerated repeatedly and has a long service life. The thermal efficiency of the whole reaction is high, but the xylene content in the product is relatively high (~2000×10-6 ) [11, 12], affecting the quality of products. Method 4 U nocal/Lummus/UOP liquid-phase method, since the 1980s, U nocal/Lummus/UOP company of the United States has jointly developed a new technology for the liquid-phase production of ethylbenzene from benzene and ethylene on a solid acid catalyst. USY zeolite is the catalyst and Al2O3 is the binder. The reaction is carried out at 232~316°C and 2.79~6.99M Pa, the mass space velocity of benzene is 2~10/h, and the benzene/ethylene molar ratio is 4~10. The method does not produce wastes that pollute the environment, the reaction temperature is low (generally not more than 300 ℃), and the xylene impurity content in ethylbenzene is only 20-40×10-6, which is far less than the gas phase method. The operating cycle of the catalyst can be as long as one year, and the requirement for the purity of the raw material is not high. The used catalyst can be regenerated outside the vessel, the regeneration conditions are moderate, and the service life can be up to 3 years. In 1990, the first set of industrial equipment was put into operation in Oita, Japan, with an annual output of 212,000 tons of ethylbenzene. The process flow is shown in Figure 3. There are more than 20 sets of devices officially put into production and under construction in the world. However, this method can only be used for the alkylation of concentrated ethylene, and is not suitable for FCC dry gas or coke oven off-gas feedstock.

Prepared by Ethylbenzene Sigma

①Using benzene as a raw material and using aluminum trichloride as a catalyst to react with ethylene to produce ethylbenzene.

②Using benzene as raw material, silica as carrier, alumina as catalyst, and reacting with ethylene at high temperature and high pressure, ethylbenzene can be obtained.

③Using benzene as raw material, using diatomite and phosphoric acid as catalyst, and carrying out multi-stage catalytic reaction with ethylene, ethylbenzene can be obtained. The above three methods all use benzene as a raw material, adopt a catalytic method to react with ethylene, and the reaction is carried out under high temperature and high pressure.

④ Ethylbenzene can also be obtained by selective alkylation with olefin-containing waste gas and aromatic hydrocarbons as raw materials and boron trifluoride as catalyst.

⑤Using hydroxyethylbenzene as raw material and using trifluoroacetic acid and triethylsilane as catalysts, ethylbenzene can be obtained.

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.

Service

Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.

 

After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.

FAQ

Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.

 

HOW TO CONFIRM THE PRODUCT QUALITY BEFORE PLACING ORDERS?

You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.

Shipping

1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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