A PROCESS FOR CATALYTIC CONVERTING HYDROCARBONS

摘要

A process for catalytic converting a hydrocarbon feed includes the following steps: catalytic cracking the hydrocarbon feed in a reactor by contacting with a catalyst system, and fractionating the reaction product from the reactor to obtain low carbon olefins, gasoline, diesel, heavy oil and other low molecular saturated hydrocarbons. The catalyst system comprises 1-60wt% zeolite mixture, 5-99wt% refractory inorganic oxide and 0-70wt% clay, based on the total weight of the catalyst. The zeolite mixture includes 1-75wt% beta zeolite modified by phosphorus and transition metal M, 25-99wt% zeolite with MFI structure and 0-74wt% large pore size zeolite based on the total weight of the zeolite mixture. The anhydrous composition of the beta zeolite modified by phosphorus and transition metal M expressed as a weight percentage based on oxide is given by: (0-0.3) Na₂O·(0.5-10) Al₂O₃·(1.3-10) P₂O₅·(0.7-15) M_xO_y·(64-97) SiO₂, wherein M is selected from the group consisting of Fe, Co, Ni, Cu, Mn, Zn and Sn, x represents the molecular number of M, and y represents the number needed for the oxidation state of M. The process for catalytic converting hydrocarbons of this invention can achieve enhanced ability of converting hydrocarbons, and increased yield of low carbon olefins, especially increased yield of propylene.