Operating Conditions And Kinetics Investgation Of Liquid-Phase Alkylation Of Benzene With Propylene Over Zeolite Catalyst

The effects of temperature, liquid space velocity and molar ratio of benzene to propylene on the liquid phase alkylation of benzene with propylene over YSBH-4 zeolite catalyst were investigated by the single factor test method in an isothermal reactor, and the global influence of them on the liquid phase alkylation and product distribution was also studied by means of orthogonal test (L16(45)). The results showed that YSBH-4 zeolite catalyst exhibited good catalytic activity and high selectivity for the liquid phase alkylation of benzene with propylene. The appropriate alkylation conditions for the isopropylbenzene synthesis were 175℃, molar ratio of benzene to propylene 7:1 and liquid space velocity 30h-1. Under above conditions, the conversion of propylene reaches 99.99%, the selectivity of isopropylbenzene, isopropylbenzene, n-propylbenzene, di-isopropyl-benzene and tri-isopropylbenzene are 82.36%,0.043%,16.52% and 1.10%, respectively.The global kinetic experiments of the liquid-phase alkylation of benzene with propylene over YSBH-4 catalyst were carried out under the conditions:165℃-190℃,3.0 MPa, the molar ratio of benzene to propylene 5-8 and no external diffusion. The power law type rate equations were chosen as the global kinetic model of this system, and the model parameters were estimated by means of Simplex optimal method. The results of the statistical analysis and the residual distribution test showed that the power law type rate equations was consistent with the experimental data, so it was quite suitable and reliable.