Patent ID: 7256318

Claim:
A process for controlling regenerator temperature, the process comprising the steps of: a) contacting an oxygenate stream with a molecular sieve catalyst in a reactor to form an olefin product and a coked catalyst; b) contacting the coked catalyst with an oxygen-containing fluid in a regenerator to form a regenerated catalyst having a coke level less than that of the coked catalyst; and c) controlling temperature and coke levels in the regenerator by circulating the regenerated catalyst to the reactor at an average catalyst feedstock exposure index of at least 0.1 to less than 1.0, wherein the regenerated catalyst is circulated to the reactor and the coked catalyst is circulated to the regenerator at a rate to maintain a delta coke to delta T ratio of from 0.001 to 0.015 weight percent per ° C., wherein the delta coke is the level of coke on the coked catalyst minus the level of coke on the regenerated catalyst, and the delta T is the temperature of the regenerated catalyst leaving the regenerator minus the temperature of coked catalyst entering the regenerator, wherein non-reactive solids which contain no reactive molecular sieve are circulated with the regenerated and coked molecular sieve catalyst.