Method of bringing a fluidized catalytic cracker-regenerator system on stream

Claim 1

IN BRINGING A CATALYTIC CRACKING PLANT ON-STREAM, SAID CATALYTIC CRACKING PLANT COMPRISING A FLUIDIZED CATALYST REGENERATOR AND A SEPARATE FLUIDIZED CATALYST REACTOR, THE COMBINATION OF STEPS WHICH COMPRISES CLOSING SAID REGENERATOR AGAINST ESCAPE OF GAS, COMPRESSING HEATED AIR INTO SAID REGENERATOR UNTIL THE PRESSURE EQUALS SUBSTANTIALLY THE NORMAL OPERATING PRESSURE AT THE REGENERATOR AIR INLET WHEREBY THE PRESSURE AT THE REGENERATOR FLUE GAS OUTLET IS SUBSTANTIALLY ABOVE THE NORMAL OPERATING PRESSURE, TRANSFERRING POWDERED CATALYST TO SAID REGENERATOR IN SUSPENSION IN SAID AIR, AND DECREASING THE BACK PRESSURE ON THE REGENERATOR FLUE GAS OUTLET AS THE CATALYST IS INTRODUCED THEREBY MAINTAINING A SUBSTANTIALLY CONSTANT PRESSURE DROP IN THE AIR PASSED THROUGH SAID REGENERATOR.