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Production method of alkylbenzene

A production method and technology of alkylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve problems such as high investment and energy consumption, accelerated catalyst carbon deposition and deactivation, and increased number of reactor stages, etc. To achieve the effect of improving use efficiency, improving utilization rate and prolonging life

Inactive Publication Date: 2003-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its shortcoming is: the outlet material of the alkylation reactor contains higher concentration of alkylbenzene and heavy component impurities that are easy to coke, and the circulation back to the reactor inlet makes the concentration of alkylbenzene and heavy component in the reactor inlet material too high, which is different from the On the one hand, the reaction of olefins will cause the reaction to proceed in the direction of producing polyalkylbenzenes, which will affect the selectivity of the target product monoalkylbenzenes; on the other hand, it will accelerate the carbon deposition and deactivation of the catalyst
In this method, all the effluents of the alkylation reaction are separated, and there is no partial flow circulation, which is not conducive to making full use of the heat of reaction, and increases the number of stages of the reactor, so the investment and energy consumption are relatively high.

Method used

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  • Production method of alkylbenzene
  • Production method of alkylbenzene
  • Production method of alkylbenzene

Examples

Experimental program
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Effect test

Embodiment 1

[0050] This embodiment is according to the attached figure 2 The flow chart shows how benzene reacts with ethylene to produce ethylbenzene.

[0051] Benzene and ethylene are reacted in an alkylation reactor equipped with an alkylation catalyst AEB-2 under the reaction conditions of a reaction temperature of 235°C, a reaction pressure of 3.6 MPa, a raw material benzene to ene ratio of 4, and a recycle ratio of 1.1. The ethylene conversion rate is 100%, the ethylbenzene selectivity is 86.5%, and the ethylation selectivity is ≥99%. Benzene and recovered polyethylbenzene are reacted in a transalkylation reactor equipped with a transalkylation catalyst AEB-1. The reaction conditions are: the reaction temperature is 220° C., the reaction pressure is 3.0 MPa, and the molar ratio of the phenyl group to the alkyl group is 8. The single-pass conversion rate of diethylbenzene in the reactant is 85.6%, and the selectivity of ethylbenzene is 100%. The transalkylation reaction product and the a...

Embodiment 2

[0056] This embodiment is according to the attached figure 2 The flow chart shows how benzene reacts with ethylene to produce ethylbenzene.

[0057] Benzene and ethylene are reacted in an alkylation reactor equipped with an alkylation catalyst AEB-2 under the reaction conditions of a reaction temperature of 235°C, a reaction pressure of 3.7 MPa, a benzene to ene ratio of 5, and a recycle ratio of 0.2. The conversion rate is 100%, the selectivity of ethylbenzene is 91.1%, and the selectivity of ethylation is ≥99%. Benzene and recovered polyethylbenzene are reacted in a transalkylation reactor equipped with a transalkylation catalyst AEB-1. The reaction conditions are: the reaction temperature is 220° C., the reaction pressure is 3.0 MPa, and the molar ratio of the phenyl group to the alkyl group is 7. The single-pass conversion rate of diethylbenzene in the reactant is 84.2%, and the selectivity of ethylbenzene is 100%. The transalkylation reaction product and the alkylation produc...

Embodiment 3

[0059] This embodiment is according to the attached figure 2 The flow chart shows how benzene reacts with propylene to produce cumene.

[0060] Benzene and propylene are reacted in an alkylation reactor equipped with an alkylation catalyst AEB-2 under the reaction conditions of a reaction temperature of 180°C, a reaction pressure of 2.8 MPa, a benzene to olefin ratio of 3, and a recycle ratio of 1.2. The conversion rate is 100%, and the isopropylation selectivity is ≥99%. Benzene and recovered diisopropylbenzene are reacted in a transalkylation reactor equipped with a transalkylation catalyst AEB-1. The reaction conditions are: a temperature of 210° C., a pressure of 3.0 MPa, and a molar ratio of phenyl and alkyl groups of 10. The single-pass conversion rate of cumene in the reactant is 81.3%, and the selectivity of cumene is greater than 99%. The product of the transalkylation reaction is sent to the rectification system together with the alkylation product to obtain benzene, cum...

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Abstract

The production method of alkylbenzene includes the following steps: feeding raw material benzene and olefine into alkylation reaction consisting of multiple reaction zones to make reaction, at least leading out a reaction effluent from the between of reaction stages in alkylation reactor as circulating material flow, adopting external circulating mode to make it single or simultaneously return into inlet of any reaction stage before the leading-out stage of the circulating material flow, separating said reaction effluent to obtain benzene, monoalkyl benzene, polyalkylbenzene and recombinant component, in which the benzene and polyalkylbenzene can be fed into transalkylation reactor to make transalkylation reaction under the action of transalkylation catalyst, the reaction effluent can be partially or completely circulated into alkylation reactor, also can be completely separated.

Description

Technical field [0001] The present invention relates to a method for preparing hydrocarbons from hydrocarbons with a small number of carbon atoms. More specifically, it is a method for producing alkylbenzene from low-carbon olefins and benzene. technical background [0002] Ethylbenzene is an important organic chemical raw material, mainly used to produce styrene. Styrene produced by the catalytic dehydrogenation of ethylbenzene accounts for about 90% of its production capacity. In recent years, the use of styrene has continued to expand, and the demand has increased day by day. By 2000, the total output of styrene in the world had increased to 20 million tons per year. Cumene is the raw material for the production of phenol and acetone, and more than 90% of the equipment used to produce phenol and acetone by the cumene method. It was predicted that their demand will grow at a rate of 3% to 4% per year. Therefore, the alkylation production process using olefin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C15/02C07C15/06
Inventor 王瑾杨克勇张凤美李明林舒兴田何鸣元王卫东
Owner CHINA PETROLEUM & CHEM CORP