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Method for synthesizing ethyl benzene and diethyl benzene

A synthesis method and technology of diethylbenzene, applied in the fields of condensation between hydrocarbons and non-hydrocarbons, organic chemistry, distillation purification/separation, etc., can solve complex process and equipment, low ethanol utilization rate, and comprehensive energy consumption reduction and other problems, to achieve the effect of comprehensive cost advantages, high utilization rate, and small loading volume

Inactive Publication Date: 2007-12-12
常州世鑫化工有限公司
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Problems solved by technology

[0006] The invention provides a synthesis method of ethylbenzene and diethylbenzene, which uses ethanol instead of ethylene as a raw material, which is different from the process route of obtaining ethylene through ethanol dehydration, and then carrying out the alkylation reaction of benzene, so as to overcome the high energy consumption of this method , the low utilization rate of ethanol and the shortcomings of complex technological process and equipment, the present invention uses ethanol and benzene as raw materials to directly synthesize ethylbenzene, completes the ethylation reaction of benzene in one step, does not need to carry out the dehydration reaction of ethanol separately, and the utilization of ethanol High efficiency, simple process flow, low overall energy consumption

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  • Method for synthesizing ethyl benzene and diethyl benzene

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Embodiment 1

[0023] A kind of synthetic method of ethylbenzene, directly synthesizes ethylbenzene and diethylbenzene with ethanol and benzene as raw material, and its technological process is as shown in Figure 1.

[0024] Benzene and 95% ethanol are heated and vaporized, and sent to an adiabatic reactor filled with molecular sieve catalysts, the molar ratio of which is benzene:ethanol=5:1. The catalyst loaded in the reactor is SH-05 type alkylation molecular sieve, under the conditions of temperature 400°C, pressure 1.4MPa, and space velocity 1.2, the ethylation reaction is carried out. The molar percentage of ethylbenzene in the reaction product is about 18%, and the molar percentage of diethylbenzene is about 5%.

[0025] The ethylation reaction product is fed from the middle of the benzene recovery tower for rectification. The operating pressure of the benzene recovery tower is 1.2MPa, the temperature at the top of the tower is 180°C, the temperature at the bottom of the tower is 240°...

Embodiment 2

[0028] Benzene and 95% ethanol are heated and vaporized, and sent to an adiabatic reactor filled with molecular sieve catalysts, the molar ratio of which is benzene:ethanol=5:1. The catalyst loaded in the reactor is DL-405, and the ethylation reaction is carried out at a temperature of 420° C., a pressure of 2 MPa, and a space velocity of 1.5. The molar percentage of ethylbenzene in the reaction product is about 17%, and the molar percentage of diethylbenzene is about 5%.

[0029] According to the method described in Example 1, benzo was reclaimed and the product was separated and purified to obtain the product ethylbenzene with a purity of 99.65%.

Embodiment 3

[0031] Benzene and 95% ethanol are heated and vaporized, and sent to an adiabatic reactor filled with molecular sieve catalysts, the molar ratio of which is benzene:ethanol=4:1. The catalyst loaded in the reactor is SH-05, and the ethylation reaction is carried out under the conditions of a temperature of 380° C., a pressure of 0.7 MPa, and a space velocity of 1.6. The molar percentage of ethylbenzene in the reaction product is about 15%, and the molar percentage of diethylbenzene is about 23%.

[0032] According to the method described in Example 1, benzene is reclaimed and ethylbenzene is separated, diethylbenzene and heavy aromatics are directly produced in the bottom of the ethylbenzene rectification tower, and the product mixed diethylbenzene (containing polyethylbenzene) is obtained. Its purity is 93%.

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Abstract

The invention discloses a method for synthesizing ethyl benzene and diethyl. It takes benzene and ethanol as raw material and comprises following steps: (A) benzene ethylization: heating benzene and ethanol for gasification, feeding them into reactor filled with molecular screen catalyst, the molar ratio between benzene and ethanol is 4- 8: 1, and the condition is at 350- 420 Deg. C and 0.7- 2 MPa; (B) recovering benzene: distilling reactant of ethylization, separating and getting mixture of benzene and ethyl benzene and diethyl; dewatering recovered benzene and using it as material for ethylization in step (A); (C) separating and refining: distilling said mixture, separating and getting ethyl benzene and diethyl. The invention replaces ethane with ethanol and finishes ethylization with one step. It is characterized by simnple process, high utilization rate of ethanol and saved investment and operational cost.

Description

technical field [0001] The invention relates to a method for synthesizing ethylbenzene and diethylbenzene, in particular to a method for directly synthesizing ethylbenzene and diethylbenzene by using ethanol and benzene as raw materials. Background technique [0002] Ethylbenzene is an important petrochemical raw material, mainly used in the production of polymer monomer - polystyrene. Various methods can be used to produce ethylbenzene. The commonly used industrial method is to use ethylene and benzene as raw materials. It is prepared through the alkylation reaction of ethylene and benzene under the action of a catalyst. The catalyst used is mainly ALCL 3 and zeolite molecular sieves. Among them, the high-temperature gas-phase or liquid-phase alkylation method catalyzed by zeolite molecular sieve has achieved great success; while the liquid-phase alkylation method catalyzed by zeolite molecular sieve has the advantages of low reaction temperature and less by-products. Ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C15/02C07C2/86C07C7/04
Inventor 花尚元
Owner 常州世鑫化工有限公司
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