DUAL RISER FLUID BED PROCESS AND REACTOR

摘要

Processes and systems for cracking feeds to produce olefins are provided. The process for cracking feeds can include converting a first feed containing at least about 50 wt % methanol in a first riser under a first set of process conditions to produce a first effluent enriched in ethylene, propylene, or a mixture thereof, wherein the first effluent contains at least about 25 wt % dry basis propylene and converting a second feed containing C4-C10 light hydrocarbons in a second riser under a second set of process conditions to produce a second effluent enriched in ethylene, propylene, or a mixture thereof. The process can also include combining the first effluent with the second effluent to produce a mixed effluent, separating the mixed effluent to produce a coked-catalyst and a gaseous product, regenerating the coked-catalyst, and recycling the regenerated catalyst to the first and second risers.

主权项

1. A dual riser fluidized catalytic cracking process, comprising:
converting a first feed comprising at least about 50 wt % methanol in a first riser under a first set of process conditions to produce a first effluent enriched in ethylene, propylene, or a mixture thereof, wherein the first effluent comprises at least about 25 wt % dry basis propylene; converting a second feed comprising C4-C10 light hydrocarbons in a second riser under a second set of process conditions to produce a second effluent enriched in ethylene, propylene, or a mixture thereof; combining the first effluent with the second effluent to produce a mixed effluent; separating the mixed effluent to produce a coked-catalyst and a gaseous product; regenerating the coked-catalyst by combusting the coke in a regenerator to produce a regenerated catalyst; and recycling the regenerated catalyst to the first and second risers.