Alkylation solid acid catalyst and process for preparing the same

Abstract

The invention discloses an alkylated solid acid catalyst and a preparation method thereof, and relates to an alkylated solid acid catalyst for a process of preparing mesitylene by mixed C9 aromatic hydrocarbon through alkalation separation and a preparation method thereof. The catalyst has higher alkylation conversion rate of the mixed C9 aromatic hydrocarbon and yield of the mesitylene under high temperature and normal pressure conditions. The catalyst takes heteropoly acid as a main active constituent, modified zirconium oxide as a carrier and alkali metal or rare earth element metal as a modifying agent; and calculated as the weight of zirconium oxide, the adding amount of the alkali metal is between 0.01 and 10 weight percent, the adding amount of the rare earth element metal is between 0.01 and 10 weight percent, the loading capacity of the heteropoly acid is between 5 and 30 weight percent, and the balance being the carrier.

Description

technical field [0001] The invention relates to an alkylation solid acid catalyst used in the process of preparing mesitylene by alkylation and separation of C9 mixed aromatics and a preparation method thereof, belonging to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Mesitylene (1,3,5-trimethylbenzene) is an important chemical raw material, and it can be used as a raw material to prepare dye intermediates, mesitidine, wheat field herbicides, and ultraviolet absorbers2,4,6 -Trimethylphenol, Antioxidant 330, etc. It is also the main raw material for the preparation of mesitylenesulfonic acid, trimesic acid, trimesic triacetic acid, etc. At present, its industrial production mainly adopts methods such as isomerization of trimethylbenzene and alkylation of C9 mixed aromatics, separation and purification, while the method of isomerization of trimethylbenzene needs to be carried out under high temperature and pr...

AI Technical Summary

Problems solved by technology

A variety of solid acid catalysts for alkylation reactions such as molecular sieves, supported heteropolyacids, and solid superacids have been reported. Solid superacid catalysts mainly include SO 4 2- / M x o y (Metal oxide) type catalyst, but the catalyst has fatal defects such as easy deactivation and short life. Molecular sieve catalysts mainly include X, Y type molecular sieves, β-molecular sieves, ZSM-5 molecular sieve series and MCM-41 molecular sieves. The main defect of the catalyst is that the oligomerization reaction products of olefin carbocations block the pores of the molecular sieve, resulting in rapid deactivation, poor stability and short life of the catalyst.