Unlock instant, AI-driven research and patent intelligence for your innovation.

Modified method for producing alkylbenzene

A production method and technology of alkylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problem of accelerating catalyst carbon deposition and deactivation, affecting the selectivity of the target product mono-alkylbenzene, and affecting the alkyl Catalyst life and other issues, to achieve the effect of flexible operation and prolonging the operation cycle

Active Publication Date: 2007-07-25
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not have the problem of mutual matching of each reaction zone, and its disadvantage is that the outlet material of the alkylation reactor contains a relatively high concentration of alkylbenzene and heavy component impurities that are easy to coke, and it is recycled back to the reactor inlet to make the reactor inlet material When the concentration of alkylbenzene and heavy components is too high, on the one hand, the reaction with olefins will cause the reaction to proceed in the direction of producing polyalkylbenzene, which will affect the selectivity of the target product monoalkylbenzene; on the other hand, it will accelerate the carbon deposition of the catalyst. live
The disadvantage of this method is that the transalkylation product is directly sent to the alkylation zone without separation, and the content of monoalkylbenzene and polyalkylbenzene is relatively high, which is unfavorable to the selectivity of the target product. There are more heavy substances, which will greatly affect the life of the alkylation catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modified method for producing alkylbenzene
  • Modified method for producing alkylbenzene
  • Modified method for producing alkylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] According to the flow process of accompanying drawing 6, benzene and ethylene react to generate ethylbenzene. Alkylation reactor 5 is an alternative reaction zone reactor. The catalyst used in the alkylation reactor 5, the alkylation reactor 8 and the alkylation reactor 10 is the same alkylation catalyst. The reaction is carried out under the reaction conditions that the circulation weight ratio is 0.6, the ethylene conversion rate is 100%, the ethylbenzene selectivity is 87%, and the ethylation selectivity is greater than or equal to 99%. Benzene and recovered polyethylbenzene are reacted in a transalkylation reactor equipped with a transalkylation catalyst. The reaction conditions are as follows: the reaction temperature is 170-250° C., the reaction pressure is 3.0 MPa, and the molar ratio of the phenyl group to the alkyl group is 12. The single-pass conversion of diethylbenzene in the reactants was 87.3%, and the ethylbenzene selectivity was 100%. The transalkylat...

Embodiment 2

[0064] According to the flow process of accompanying drawing 6, benzene and propylene react to generate cumene. Alkylation reactor 5 is an alternative reaction zone reactor. The catalyst used in the alkylation reactor 5, the alkylation reactor 8 and the alkylation reactor 10 is the same alkylation catalyst. The reaction is carried out under the condition that the weight ratio is 0.4, the conversion rate of propylene is 100%, the selectivity of cumene is 89%, and the selectivity of isopropylation is ≥99%. The benzene and recovered dicumylbenzene are reacted in a transalkylation reactor equipped with a transalkylation catalyst. The reaction conditions are: a reaction temperature of 160-240° C. and a reaction pressure of 2.6 MPa. The single-pass conversion rate of cumene in the reactant is 80%, and the selectivity of cumene is greater than 99%. The transalkylation reaction product and the alkylation product are sent to the rectification system for separation to obtain benzene,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An improved process for preparing alkylbenzene from benzene and olefin includes such steps as adding said raw materials to a multi-segment alkylating reactor containing substitutional reaction region, alkylating reaction, tapping part of resultant and returning it back to the inlet of any reaction segment, separating the reaction resultant to obtain benzene, monoalkyl benzene, polyalkyl benzene and heavy component, adding benzene and polyalkylbenzene to an alkyl transfer reactor, catalytic alkyl transfer reaction, and returning part or all the resultant back to alkylating reactor or separating product.

Description

technical field [0001] The present invention relates to a method for preparing hydrocarbons from hydrocarbons with fewer carbon atoms, more particularly, a method for producing alkylbenzenes from light olefins and benzene. Background technique [0002] Ethylbenzene is an important organic chemical raw material, mainly used for the production of styrene. Styrene produced by catalytic dehydrogenation of ethylbenzene accounts for about 90% of its production capacity. In recent years, the use of styrene has been expanding and the demand has been increasing, and by 2000, the total production of styrene in the world has increased to 20 million tons / year. Cumene is the raw material for the production of phenol and acetone, and more than 90% of the devices use the cumene method to produce phenol and acetone. It has been predicted that their demand will grow at an annual rate of 3% to 4%. Therefore, the alkylation production process with olefins and benzene...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/64C07C15/00
Inventor 王瑾杜伟彦张凤美舒兴田杨克勇何鸣元
Owner CHINA PETROLEUM & CHEM CORP