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Method for producing isopropyl benzene under critical state

A critical state and production method technology, applied in the production of bulk chemicals, chemical instruments and methods, hydrocarbons, etc., can solve the problems of low acid strength, low space velocity, high styrene-ene ratio, etc., and achieve convenient operation and simple process , the effect of high conversion rate

Active Publication Date: 2008-06-11
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is that although the catalyst has enough acid centers to catalyze the alkylation reaction, due to its low acid strength, it does not have the function of alkylation transfer. Therefore, dicumyl can only be drawn as a by-product and cannot be recycled, reducing the Product yield of the whole plant
The common shortcoming of above-mentioned method is that the benzene ratio of reaction is high, and space velocity is low, and the life-span of catalyst is shorter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: An Hβ catalyst with a particle size of 20-40 meshes was used to carry out the alkylation reaction of benzene and propylene in a fixed-bed reactor under a critical state. The specific reaction conditions are: the reaction temperature is 300°C, the reaction pressure is 5.7MPa, and the weight space velocity of benzene is 60h -1 , the molar ratio of benzene to propylene is 4, the conversion rate of propylene is 100%, and the service life of the catalyst can reach 230 hours.

Embodiment 2

[0020] Example 2: An Hβ catalyst with a particle size of 20-40 meshes was used to carry out the alkylation reaction of benzene and propylene under a critical state in a fixed-bed reactor. The specific reaction conditions are: the reaction temperature is 300°C, the reaction pressure is 5.0MPa, and the weight space velocity of benzene is 60h -1 , the molar ratio of benzene to propylene is 4, the conversion rate of propylene is 100%, and the service life of the catalyst can reach 186 hours.

Embodiment 3

[0021] Example 3: The alkylation reaction of benzene and propylene was carried out in a fixed-bed reactor in a critical state using Hβ catalyst with a particle size of 20-40 mesh. The specific reaction conditions are: the reaction temperature is 290°C, the reaction pressure is 5.7MPa, and the weight space velocity of benzene is 60h -1 , the molar ratio of benzene to propylene is 4, the conversion rate of propylene is 100%, and the service life of the catalyst can reach 86 hours.

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PUM

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Abstract

This invention relates to critical state cumene generating method. reaction material is benzene and propylene, firstly, material contains at least 95 weight percent benzene is filled into reaction region with molecular sieve catalyst, benzene and propylene mol ratio is 2-10, reaction temperature is 260-340 degrees centigrade, reaction pressure is 4.0-10 MPa, it is supercriticality, benzene weight air speed is under condition of 2-200 hours -1, cumene and multi alkyl benzene by-product are generated. Benzene propylene ratio in this invention is low, air speed is high, reaction conversion is high, product selectivity is good, and catalyst life is long.

Description

field of invention [0001] The present invention relates to the preparation of cumene, and more particularly relates to the method for preparing cumene by alkylation of benzene and propylene under the condition that the mixture including reactants and products is in a critical state. technical background [0002] Alkylation of benzene with propylene is an important method for the synthesis of cumene, and its products include cumene and polyisopropylbenzene. Cumene is an important raw material for the synthesis of phenol, acetone and α-methylstyrene, and more than 90% of cumene is used to produce phenol and acetone. According to the statistical analysis of the Stanford Research Institute in the United States, the annual growth rate of demand for cumene is 3.6% until 2011, and the demand in 2011 will reach 13.055 million tons. [0003] The method of producing cumene by the alkylation of benzene and propylene has been industrialized since 1942, and the catalyst and process have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C15/085B01J29/06
CPCY02P20/52
Inventor 王建国田震王国富秦张峰董梅
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI