DUAL RISER FCC REACTOR PROCESS WITH LIGHT AND MIXED LIGHT/HEAVY FEEDS

摘要

The first hydrocarbon feedstock (5) and the second hydrocarbon feedstock (6) Each of the first riser ( 2) and is fed to the second riser (4) ethylene, propylene and / or a dual riser FCC process is the perfume to form a rich effluent is disclosed. If the hydrocarbon raw material other, each of the riser may have a different condition to convert it to ethylene and / or propylene. To reduce the additional amount of fuel needed to maintain the heat balance of the system, or small amounts of coke precursors for removing (80, 82) is a hydrocarbon raw material (5, 6) can be added to either one or both of. Coke precursor and the recycled raw material (36, 44) is another material that may be separated include to increase the olefin yield, the paraffin material in this embodiment is supplied to one of the riser olefin feed is supplied to the other riser.