Catalytic cracking process

Abstract

Abstract IN A CATALYTIC CRACKING PROCESS COMPRISING FORMING A SUSPENSION OF CATALYST PARTICLES IN HYDROCARBON VAPORS, PASSING SAID SUSPENSION THROUGH A CONVERSION ZONE WHEREIN SAID HYDROCARBONS ARE CRACKED, SEPARATING SAID CRACKED HYDROCARBONS FROM THE SPENT CATALYST PARTICLES, PASSING SAID CRACKED HYDROCARBONS TO A RECOVERY ZONE, STRIPPING SAID SPENT CATALYST PARTICLES OF RESIDUAL HYDROCARBON VAPORS IN A STRIPPING ZONE, REGENERATING SAID SPENT CATALYST TO ACTIVE CATALYST IN A REGENERATOR ZONE AND RECYCLING SAID ACTIVE CATALYST TO SAID CONVERSION ZONE, THE IMPROVEMENT IS PROVIDED WHICH COMPRISES MAINTAINING A SUBSTANTIALLY CONSTANT CATALYST INVENTORY LEVEL IN THE STRIPPING ZONE ESSENTIALLY INDEPENDENTLY OF ANY CHANGE IN THE CATALYST CIRCULATION RATE WITHIN THE CONVERSION ZONE BY INTERPOSING A HYDRAULIC CATALYST SEAL BETWEEN THE CONVERSION ZONE AND THE STRIPPING ZONE, WHEREBY UPON ANY CHANGE IN THE CATALYST CIRCULATION RATE WITHIN THE CONVERSION ZONE, THE PRESSURE WITHIN THE STRIPPER IS INDEPENDENTLY COMMENSURATELY ADJUSTED CAUSING A COMPENSATING CHANGE IN THE HYDRAULIC CATALYST SEAL THEREBY MAINTAINING THE CATALYST INVENTORY LEVEL IN THE STRIPPER SUBSTANTIALLY CONSTANT.

Inventors

• 👤 Arthur L Saxon
• 👤 Ronald J Jenkinson

Bibliographic Details