A kind of preparation method of high selectivity benzene alkylation catalyst

Abstract

The invention belongs to the technical field of a petrochemical industry catalyst and provides a preparation method of a high-selectivity benzene alkylation catalyst. The preparation method comprisesthe following steps: of step 1: selecting an MFI zeolite molecular sieve with a high silicon-aluminum ratio as a parent body of the catalyst; step 2: extruding and molding hydrolysate of acidified silicone grease and the MFI zeolite molecular sieve with the high silicon-aluminum ratio; then treating the molded MFI zeolite molecular sieve with the high silicon-aluminum ratio by utilizing a separated mother solution obtained by hydrothermally crystallizing the MFI zeolite molecular sieve with the high silicon-aluminum ratio; step 3: converting the MFI zeolite molecular sieve with the high silicon-aluminum ratio, which is treated by the mother solution, into a hydrogen type alkylation catalyst by adopting an ion exchange method. According to the preparation method provided by the invention,the smother solution generated by hydrothermally synthesizing the MFI zeolite molecular sieve with the high silicon-aluminum ratio is used for treating the molded strip-shaped catalyst, so that usefulcomponents in the mother solution are recycled and a pore channel of the catalyst is dredged; environment pollution in a whole production chain of the alkylation catalyst is also reduced.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and relates to a preparation method of a benzene alkylation catalyst. Background technique [0002] The gas-phase alkylation of benzene, methanol and ethanol can be used to synthesize xylene and ethylbenzene respectively, the former can be used to produce p-xylene, and then produce terephthalic acid; the latter can be used for dehydrogenation to produce styrene, and then produce polyphenylene vinyl etc. Because of the generation of water, the alkylation of benzene and methanol, and benzene and ethanol can only be carried out under high temperature and gas phase reaction conditions, so the following common problems are faced: how to reduce the mutual isomerization side effects between xylene and ethylbenzene reaction. That is to say, in the alkylation of benzene and methanol, it is necessary to minimize the further isomerization reaction of the target product xylene to the by-pro...

AI Technical Summary

Problems solved by technology

Because the small amount of xylene impurities generated by this side reaction will affect the purity of downstream products of styrene, limiting its application range

[0003] The preparation method of the benzene alkylation catalyst disclosed by the existing patent does not solve the above problems well