Method for synthesizing ethylbenzene

A synthesis method and technology of ethylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low investment and operating costs, low 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: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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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  • Method for synthesizing ethylbenzene

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Embodiment 1

[0020] A 30,000 tons / year ethanol and benzene one-step synthesis of ethylbenzene device, using the figure 1 In the ethylbenzene synthesis technology shown, raw material ethanol with a purity of 95% is heated and gasified, mixed with raw material benzene and recycled benzene after gasification heating, and enters an alkylation reactor equipped with a ZSM-5 nano-scale molecular sieve catalyst, and benzene and The molar ratio of ethanol is 6:1, the inlet temperature of the alkylation reactor is 380°C, the pressure is 1.2MPaG, and the weight space velocity of ethanol is 1.5 hours -1, after the reaction, the discharge temperature is 400°C, wherein the weight percentage of ethylbenzene is 16%, and diethylbenzene is 1.6%. ℃, reflux ratio 1 using 45 floating valve trays, after the overhead flow is condensed by the benzene tower top condenser, the water is separated, and the water content in the benzene after the water separation is 0.1%, and part of it is recycled back to the alkylati...

Embodiment 2

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

[0024] The total raw material cost of the device is 8920 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 ethylbenzene synthesis device, the inlet temperature of the transalkylation reactor is 220°C, the pressure is 3.0MPaG, the weight ratio of benzene and polyethylbenzene is 7:1, and the liquid weight space velocity is 2 hours -1 , the conversion rate of polyethylbenzene was 70%, and other technological processes and operating parameters were 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 synthesis method of ethylbenzene, which mainly solves the problems that the conventional ethylbenzene production process must rely on ethylene as a raw material, the cost of the raw material is high, and the content of xylene in the ethylbenzene product 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, and more than 90% of ethylbenzene is used for Styrene is produced. 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 as an organic reaction Intermediates are also widely used in pharmaceutical, paint, pigment and textil...

Claims

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Application Information

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Patent Type & Authority Patents(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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