The Research Of Synthesize With βand MCM-22 Zeolite In The Isopropylbenzene

Isopropylbenzene (IPB), is an important organic materials, more than 90% of which was used to produce phenol and acetone, acetophenone andα-methy- lstyrene. Processes for the industrial production of cumene were the traditional SPA (solid phosphoric acid) and Friedal-Crafts (AlCl3) process in 1990s. In catalytic reaction, zeolite molecular sieve is a widely used new catalytic material, as it has appropriate acidity, unique pore system, ion exchange characteristics and catalytic reaction stability.In the work, we compared the performance of Beta zeolite and MCM-22 zeolite in the isopropylbenzene production. MCM-22 zeolite shows higher stability in the alkylation reaction at low temperature and lower feed ratio of benzene to propylene than Beta zeolite. Meanwhile, the molar ratio of n-propylbenze to isopropylbenze over MCM-22 zeolite is increased as that over Beta zeolite.MCM-22 zeolite treated by citric acid behaves higher stability in the alkylation reaction than others. The conversion of benzene can reach to 44%, and the molar ratio of n-propylbenze to isopropylbenze is below 170 ug·g-1.Citric acid treated MCM-22 modified with Ag, Zr, Ce, La oxides behaves lower stability in the alkylation reaction than citric acid treated MCM-22. The regeneration of deactivation zeolite route of washing with citric acid first then calcining is very efficient.