Liquid Phase Alkylation Of Benzene With Propylene

The influence of reaction conditions on alkylation with benzene and propylene over beta was studied systemically in this paper, the effect of beta with Na+modification and the addition of isopropanol to feed was investigated. The acidity characteristics and catalytic performance of 10MR (ZSM-5),12MR (B),10MR and 12MR double-pore nanozeolites (M) and mixture of two of these were performed by NH3-TPD,py-IR and the liquid alkylation of benzene and propylene that was carried out in a small fixed-bed reactor. The catalystic activity of the mixed catalyst with better reaction was compared with REF-1 and REF-2, and the stability of the former was studied. The followed results were obtained:(1)The benzene conversion, cumene yield and selectivity was enhanced with the increase of reaction temperature over beta catalyst, and the relative amount of n-isopropoylene was increased sharply; an increase of the pressure resulted in the benzene conversion, yield and selectivity of cumene and diisopropylbenzene was enhanced, the tiisopropylbenzene selectivity and n-isopropylene amount was decreased; benzene conversion, cumene yield decreased, and the selectivity of cumene and tiisopropylene were reduced when the WHSV increased. The appropriate reaction condition were 160℃,3.5 MPa and 0.72 h-1. The addition of isopropanol decreased the reaction performance. The benzene conversion over beta catalyst was enhanced by the Na+modification, but the acidity, pore structure and reaction performance affected little with a small amount of Na+modification.(2)The acidity of ZSM-5 (Z) is weaker than both B and M molecular sieves, the two later possess very similar acid distribution. The catalytic activity of alkylation was increased according to the order with Z