Patent ID: 8865608

Claim:
A process for regenerating catalyst, the process comprising: removing a first gas stream from a regeneration tower; passing the first gas stream to an air heater to form a heated first gas stream; dividing the heated first gas stream to form a regeneration tower return stream and a cooling loop stream; cooling the cooling loop stream in a cooling zone cooler to form a cooled stream; providing a first thermocompressor and a second thermocompressor; selectively providing the cooled stream to the first thermocompressor that utilizes a first motive vapor for a period of time and the second thermocompressor that utilizes nitrogen as a second motive vapor for another period of time, to produce a catalyst cooling stream wherein the nitrogen is provided to the second thermocompressor at a higher pressure than the first motive vapor is provided to the first thermocompressor; and providing the catalyst cooling stream to the regeneration tower.