Ethylbenzene production process

FIELD: industrial organic synthesis.

SUBSTANCE: alkylation of benzene with ethylene is carried out by supplying dried benzene feed, aluminum chloride-based catalytic complex, ethylene, recycled catalytic complex, and return benzene to alkylation reactor; separating resulting reaction medium from catalytic complex; neutralizing reaction medium with alkali; and flushing with water alkali; followed by rectification separation of reaction medium. According to invention, reaction components are preliminarily mixed in turbulent mode and fed into alkylation reactor also under turbulent conditions.

EFFECT: increased degree of benzene conversion.

2 ex

 

The invention relates to the field of petrochemical industry, specifically to the process of obtaining ethylbenzene by alkylation of benzene with ethylene in the presence of catalytic complex based on aluminium chloride.

A known method of producing ethylbenzene, comprising the alkylation of benzene with ethylene in the presence of aluminum chloride, separation of the target product by distillation from unreacted benzene and hydrocarbon impurities, azeotropic drying of the mixture of the source of benzene with unreacted benzene and hydrocarbon impurities with a selection of dried benzene is recycled to the alkylation, and the fraction containing water and hydrocarbon impurities and benzene, which is subjected to condensation with obtaining hydrocarbon and aqueous layers (A.S. USSR №825466, IPC C 07 C 2/58, 15/02, publ. 30.04.81).

The disadvantage of this method is the increased consumption of aluminium chloride and benzene.

A known method of producing ethylbenzene by alkylation of benzene with ethylene in the presence of catalytic complex based on aluminium chloride (Tuvastatav, Alikely. "Technology of synthetic rubbers", M, "Chemistry", 1980, p.108-112). The catalytic complex obtained from aluminum chloride, ethylchloride, diethylbenzene and benzene, served continuously in the lower part of the alkylation reactor, where transferred continuously drained fresh and return the benzene, as well as ethylene, diethylbenzene, saturated with benzene, and recirculating catalytic complex. Liquid products of the alkylation of benzene from the upper part of the reactor do in the sump, which is divided into two layers. The bottom layer is a catalytic complex is returned to the reactor, the upper layer - alkylate is fed to the mixing water for the destruction of the residues of the catalytic complex, the neutralization of the aqueous solution of alkali and washing from alkali. Next alkylate is subjected to three-stage rectification emitting in the first column of unreacted benzene and return it to the alkylation reactor, emitting in the second column of the target product ethylbenzene and in the third column - diethylbenzene returned to the reactor for dealkylation, and polyalkylbenzenes sent to the warehouse.

The disadvantage of this method of producing ethylbenzene is not high enough conversion process is 90-95% benzene and about 93% of ethylene.

A known method of producing ethylbenzene, comprising the alkylation of benzene with ethylene in the presence of catalytic complex based on aluminium chloride and distillation of the reaction mass (Pasiecznik, Van, Limpopo. "Album of technological schemes of the main production of the synthetic rubber industry". L., "Chemistry", 1986, p.94-97). In the lower part of the reactor Ala the modelling through the collector is fed dried benzene mixture, fresh and recirculating catalytic complex fraction polyalkylbenzenes and ethylchloride, ethylene is fed directly into the lower part of the reactor. From alkylator reaction mass is directed into a settling tank to separate from the circulating catalyst complex and then water washing, neutralization with alkali solution and water washing from alkali. The washed reaction mass is separated by rectification with selection in the first column of unreacted benzene, ethylbenzene is rectified in the second column and fractions polyalkylbenzenes in the third distillation column.

The disadvantage of this method is poor mixing of the components fed to the alkylation reactor, and, as a consequence, low conversion process.

The objective of the invention is to increase the conversion of the production of ethylbenzene.

The task is solved by providing a method of producing ethylbenzene, comprising the alkylation of benzene with ethylene by feeding the dried benzene mixture, the catalytic complex based on aluminium chloride, ethylene, recirculating catalytic complex and the return of benzene in the alkylation reactor, separating the resulting reaction mass from the catalytic complex, neutralizing the reaction mixture with alkali and washing with water from the alkali and subsequent separation of the reaction mixture by distillation, thus, before feeding into the reactor to carry out the alkylation mixture of dried benzene mixture, the catalytic complex, ethylene, recirculating catalytic complex and the return of benzene in the turbulent regime and served them to the alkylation reactor in conditions of turbulence.

The difference of the proposed method against known is that prior to being fed into the reactor alkylation dried benzene mixture, the catalytic complex, ethylene, recirculating catalytic complex and reflexive benzene are mixed in the turbulent regime and in the alkylation reactor can enjoy them in conditions of turbulence.

As the device with which it is possible to achieve turbulent mixing threads and give them a whirl, can be used, for example, bethey mixer, fitted with the confuser-diffuser sections, or loaded into the tube ring process, or any other known means, made of chemically resistant materials or protective chemically resistant coating.

The proposed method ethylbenzene was obtained as follows.

The process of alkylation of benzene with ethylene is carried out in the alkylation reactor column type at a temperature of 125-140°and the pressure of the top of 0.12 to 0.25 MPa. In the lower part of the reactor alkylation by t ruliderulide device continuously receives the dried benzene mixture, the catalytic complex of aluminium chloride, ethylene, recirculating catalytic complex and reflexive benzene. All the components are mixed in the turbulent regime and fed into the reactor under conditions of turbulent flow. From the reactor alkylation reaction mass is fed into the sludge for sludge recirculating catalytic complex. Settled recycled catalytic complex is displayed on the bottom of the sump and is returned to the alkylation reactor. To maintain the catalytic activity of the complex in the line of recycled catalytic complex is served ethyl chloride. Next, the reaction mass is fed into a mixer where it is mixed with acidic water at a ratio of water:reaction mass of at least 1:1. Sucks reaction mass of water is in the sump, where the upper layer of the reaction mass flows into the wash column is washed with water and then neutralizing 2-10%solution of alkali. The neutralized reaction mass is fed to the column by washing with water from alkali. Washing the reaction mass from the alkali can be made with water or steam condensate. The washed reaction mass is fed to the separation in the first distillation column, where the distillate is allocated unreacted benzene, which is fed to the dehydration. CBM product personology is fed to the second distillation column. The distillate of the column produce the target product ethylbenzene, and CBM product is fed into a third distillation column, where the distillate allocate fractions of diethylbenzene and polyalkylbenzenes.

The implementation of the method illustrated by the following examples.

Example 1

In the lower part of the reactor alkylation through bethey mixer, equipped with a cone-confused sections, continuously served the dried benzene mixture, the catalytic complex of aluminium chloride, ethylene, recirculating catalytic complex and reflexive benzene. All the components are mixed in the turbulent regime and fed into the reactor under conditions of turbulent flow. The process of alkylation of benzene with ethylene is carried out in the alkylation reactor column type at a temperature of 130°and the pressure of the top of 0.20 MPa. From the reactor alkylation reaction mass enters the settling tank for sludge recirculating catalytic complex. Settled recycled catalytic complex is displayed on the bottom of the sump and is returned to the alkylation reactor. Next, the reaction mass is fed into a mixer where it is mixed with acidic water at a ratio of water:reaction mass of at least 1:1. Sucks reaction mass of water is in the sump, where the top layer - reaction mass - arrives in about yunwu the column is washed with water and then neutralizing 2-10%solution of alkali. The volumetric ratio of alkali solution to the reaction mass can withstand equal to 1:1. The neutralized reaction mass is fed to the column by washing with water from alkali. The washed reaction mass is fed to the separation in the first distillation column, where the distillate is allocated unreacted benzene, which is fed to the dehydration. VAT product of the first column is fed to the second distillation column. The distillate of the column produce the target product ethylbenzene containing 99.8% of wt. ethylbenzene, and CBM product is fed into a third distillation column, where the distillate allocate fractions of diethylbenzene and polyalkylbenzenes. The conversion process benzene is 97%, ethylene - 95%.

Example 2

Ethylbenzene get in the same way as described in example 1, but the mixture of dried benzene mixture, the catalytic complex, ethylene, recirculating catalytic complex and reflexive benzene before submitting to the rector of the alkylation is carried out in a tube filled with rings process.

The conversion process benzene is 98%, ethylene - 95,5%.

As can be seen from the above examples, the pre-mixing the dried benzene mixture, the catalytic complex, ethylene, recirculating catalytic complex and the return of benzene in the turbulent regime before what odaca in rector alkylation and filing of all components in the alkylation under conditions of turbulence allows to achieve high levels of conversion upon receipt of ethylbenzene.

The method of producing ethylbenzene, comprising the alkylation of benzene with ethylene by feeding the dried benzene mixture, the catalytic complex based on aluminium chloride, ethylene, recirculating catalytic complex and the return of benzene in the alkylation reactor, separating the resulting reaction mass from the catalytic complex, neutralizing the reaction mixture with alkali and washing with water from the alkali and subsequent separation of the reaction mixture by distillation, characterized in that prior to being fed into the reactor to carry out the alkylation mixture of dried benzene mixture, the catalytic complex, ethylene, recirculating catalytic complex and the return of benzene in the turbulent regime and served them to the alkylation reactor in conditions of turbulence.



 

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