Synthesis method of linear alkylbenzene

Abstract

A process for preparing straight-chain alkylbenzene from C2-C20 straight-chain olefine and benzene features the alkylating reaction between benzene and olefine in the ratio of (2-100):1 in supercritical condition (290-450 deg.C and 5-15 MPa) under the action of solid acid catalyst. Said catalyst is the P-Al molecular sieve with AIPO4-5 crystal structure or the P-Al molecular sieve composition containing substitute element.

Description

(1) Technical field [0001] The invention relates to a method for synthesizing linear alkylbenzene, in particular to a method for synthesizing linear alkylbenzene using solid acid as a catalyst. (2) Background technology [0002] Linear alkyl benzene is the alkylation product of linear olefin and benzene under the action of a catalyst, and is the sulfonated raw material for the production of sodium linear alkyl benzene sulfonate detergent. The industry generally uses hydrofluoric acid-catalyzed alkylation process to synthesize linear alkyl benzene. As hydrofluoric acid corrodes equipment, pollutes the environment, and is difficult to separate from alkylation products, the use of non-corrosive, non-toxic solid acid catalysts instead of hydrofluoric acid catalysts, and the use of environmentally friendly alkylation processes to synthesize linear alkyl benzene has been Become an inevitable development trend. [0003] CN1072353A discloses the use of a Y-type molecular sieve modified b...

AI Technical Summary

Problems solved by technology

[0005] Although the solid acid alkylation process overcomes the shortcomings of the traditional hydrofluoric acid process, the current solid acid catalyst is prone to deactivation and has a short single-pass life. The solid acid process requires frequent switching operations between alkylation reaction and catalyst regeneration