The synthesis method of ethylbenzene

A synthesis method and ethylbenzene technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low investment and operating costs, cheap and easy availability of ethanol raw materials, low ethanol utilization rate, large energy consumption, etc. , to achieve the effect of low operating cost, simple process and large-scale solution

Active Publication Date: 2011-12-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the ethanol dehydration process consumes a lot of energy, and some side reactions also occur during the dehydration reaction. The utilization rate of ethanol is low, and the increase in investment and operating costs reduces the advantage of cheap and easy-to-obtain ethanol raw materials.

Method used

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  • The synthesis method of ethylbenzene
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Examples

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Effect test

Embodiment 1

[0020] A 30,000-ton / year ethanol and benzene one-step synthesis of ethylbenzene plant adopts figure 1 As shown in the ethylbenzene synthesis technology, 95% pure raw material ethanol is heated and gasified, and then mixed with the heated raw material benzene and recycled benzene into the alkylation reactor equipped with ZSM-5 nano-scale molecular sieve catalyst. The molar ratio of ethanol is 6:1, the inlet temperature of the alkylation reactor is 380℃, the pressure is 1.2MPaG, and the ethanol weight space velocity is 1.5 hours. -1 After the reaction, the discharge temperature is 400℃, of which the weight percentage of ethylbenzene is 16%, and the weight percentage of diethylbenzene is 1.6%. The reaction product enters the benzene tower. The operating pressure at the top of the benzene tower is 1.0MPaG, the top temperature is 160℃, and the bottom temperature is 250 ℃, reflux ratio 1 uses 45 float valve trays, the top stream is condensed by the condenser at the top of the benzene ...

Embodiment 2

[0023] In a 30,000-ton / year ethanol and benzene one-step synthesis of ethylbenzene, the molar ratio of benzene to ethanol in the alkylation reactor is 5:1, and the other process flow and operating parameters are the same as in Example 1. The alkylation reactor outlet The weight percentage of ethylbenzene in the material is 15%, and diethylbenzene is 2.0%.

[0024] The total raw material cost of this device is 8,920 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.8%, the content of xylene in ethylbenzene is 700ppm, the unit consumption of ethanol is 446 kg / ton of ethylbenzene, and the energy consumption is 920 MJ / ton of ethylbenzene.

Embodiment 3

[0026] A 60,000-ton / year ethanol and benzene one-step synthesis of ethylbenzene plant, the transalkylation reactor inlet temperature is 220℃, the pressure is 3.0MPaG, the weight ratio of benzene to polyethylbenzene is 7:1, and the liquid weight space velocity is 2 hours -1 , The conversion rate of polyethylbenzene is 70%, and the other process flow and operating parameters are the same as in Example 1.

[0027] The total raw material cost of the device is 8870 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.82%, the content of xylene in ethylbenzene is 650ppm, the unit consumption of ethanol is 442 kg / ton of ethylbenzene, and the energy consumption is 920 MJ / ton of ethylbenzene.

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Abstract

The invention relates to a method for synthesizing ethylbenzene, and mainly solves the problems that ethylene must be taken as a raw material, the cost of the raw material is high and the content of dimethylbenzene is high in the product ethylbenzene in the conventional ethylbenzene production process. The method comprises the following steps that: a) benzene and ethanol enter an alkylation reactor loaded with a ZSM-5 nanoscale molecular sieve catalyst in a molar ratio of (2-8):1 under gas phase conditions and react to form a mixture 103 comprising benzene, ethylbenzene, diethylbenzene and water; b) the mixture 103 sequentially passes through a benzene recovery tower, an ethylbenzene recovery tower and a polyethylbenzene recovery tower so as to separate the water, the benzene, the ethylbenzene and the diethylbenzene from the mixture 103; and c) the partial benzene and diethylbenzene which are obtained through the separation enter a transalkylation reactor in a weight ratio of (2-10):1 under liquid phase conditions and are contacted with a Beta molecular sieve catalyst for a transalkylation reaction so as to generate the ethylbenzene. The technical scheme better solves the problems; in the scheme, the ethylbenzene is synthesized by using the ethanol as the raw material instead of the ethylene, the cost of the raw material is low, and the content of the dimethylbenzene in the product ethylbenzene is low; and the technical scheme can be used for the industrial production of the ethylbenzene.

Description

Technical field [0001] The invention relates to a method for synthesizing ethylbenzene, which mainly solves the problems that the previous ethylbenzene production process must rely on ethylene as a raw material, the raw material cost is high, and the content of xylene in the product ethylbenzene is high. Background technique [0002] Ethylbenzene is an important chemical raw material and an indispensable key raw material for the production of styrene. Most ethylbenzene manufacturers produce ethylbenzene for the production of styrene in their own styrene plants. About 90% of the ethylbenzene is used Production of styrene. Styrene is an important basic organic chemical raw material, mainly used in the field of polymer materials to prepare polystyrene and its copolymers, such as ABS, AS, styrene butadiene rubber and its unsaturated polyester. In addition, styrene is used as an organic reaction Intermediates are also widely used in the pharmaceutical, coating, pigment and textile in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66C07C6/12
Inventor 刘文杰杨为民张洪宇
Owner CHINA PETROLEUM & CHEM CORP
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