Patent ID: 6613710
Filing Date: 2003-09-02
Classification: B01J,C10G

Abstract:
A process for the preparation of bi-functional catalyst for Fluid Catalytic Cracking (FCC), to obtain enhanced yields of LPG and reduced slurry oil, said process comprising:(i) preparing a modified kaolin clay slurry by mixing finely milled natural clay powder with phosphoric acid, and aging the clay slurry for 1 to 16 hours at a temperature ranging between 15 and 40Â° C.; (ii) preparing a semi-basic alumina by mixing a solution of sodium aluminate and aluminum sulphate at elevated temperatures, mixing under aging conditions for about 30 minutes to 3 hours and removing alumina crystals by filtration and washing the semi-basic alumina cake with water at about 75-85Â° C.; (iii) mixing 40-80 wt % of the modified clay slurry (of step i) with 1-20 wt % of the finely dispersed semi-basic alumina (of step ii) and homogenizing the mixture with crystalline molecular sieve zeolite, which is present in the range of 0.5 to 15 wt %; (iv) spray drying the final slurry; and (v) calcining the spray dried product to obtain said bi-functional catalyst.