Method for synthesizing ethylbenzene from ethanol and benzene

A technology for synthesizing ethylbenzene and ethanol, applied in chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, hydrocarbons, etc., can solve the problems of high raw material costs and dependence, and achieve simple processes and low operating costs , the effect of less process

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the production process of ethylbenzene must rely on ethylene as a raw material in the past, and the raw material cost is high. A new method for synthesizing ethylbenzene from ethanol and benzene is provided, which has the ability to use ethanol instead of ethylene as a raw material Synthesis of ethylbenzene with benzene, and the advantages of low raw material cost

Method used

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  • Method for synthesizing ethylbenzene from ethanol and benzene

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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 stream 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 alky...

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 9010 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.8%, 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 device, the inlet temperature of the alkylation reactor is 400 ° C, other process flow and operating parameters are the same as in Example 1, and the weight percentage of ethylbenzene in the outlet material of the alkylation reactor is 16%, diethylbenzene is 1.65%.

[0027] The total raw material cost of the device is 8990 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.82%, the unit consumption of ethanol is 442 kg / ton of ethylbenzene, and the energy consumption is 980 MJ / ton of ethylbenzene.

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Abstract

The invention relates to a method for synthesizing ethylbenzene from ethanol and benzene. The method is used for mainly solving the problems that the traditional ethylbenzene production process must depend on ethylene as a raw material and has high raw material cost. The problems are well solved by adopting the technical scheme as follows: the method comprises the following steps: (a) the benzene and the ethanol enter an alkylation reactor filled with a ZSM-5 nano-scale molecular sieve catalyst to be reacted under a gaseous phase condition according to the mol ratio of (2-8):1 so that a mixture 103 including benzene, ethylbenzene, diethylbenzene and water is obtained; (b) the mixture 103 sequentially passes through a benzene recovery tower, an ethylbenzene recovery tower and a poly-ethylbenzene recovery tower so that the water, the benzene, the ethylbenzene and the diethylbenzene in the mixture are separated; and (c) a part of the separated benzene and the diethylbenzene enter an alkyl transfer reactor under a gaseous phase condition according to the weight ratio of (2-10):1 and are in contact with the ZSM-5 molecular sieve catalyst to carry out alkyl transfer reaction so that the ethylbenzene is generated. According to the method, the ethylene is replaced by ethanol as a raw material; the ethanol and the benzene are used for synthesizing the ethylbenzene; the raw material cost is low; and the method can be applied in the industrial production of the ethylbenzene.

Description

technical field [0001] The invention relates to a method for synthesizing ethylbenzene from ethanol and benzene, which mainly solves the problem that the conventional production process of ethylbenzene must rely on ethylene as a raw material and the raw material cost 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 textile industries. Along with the automo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C6/12C07C2/88
Inventor 杨为民刘文杰孙洪敏张斌
Owner CHINA PETROLEUM & CHEM CORP
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