Integration of cyclic dehydrogenation process with FCC for dehydrogenation of refinery paraffins

摘要

A process for increasing light olefin yields from the fluidized catalytic cracking process. The process combines small units to treat the paraffinic components in the product streams from the fluidized cracking process. The paraffins are dehydrogenated and light olefins are separated. Heavier olefins are passed to an olefin cracking unit for increasing the yields of ethylene and propylene.

主权项

1. A process for converting a hydrocarbon stream to light olefins, comprising:
passing a hydrocarbon stream to a fluid catalytic cracking (FCC) unit, thereby creating a cracked effluent stream; separating the cracked effluent stream, thereby creating a first process stream comprising light olefins, and a second process stream comprising olefins and paraffins in the C4 to C12 range; passing the second stream to an olefin cracking reactor, thereby creating a conversion product stream with an increased content of light olefins; separating the conversion product stream into a light olefin product stream, and a light olefin depleted stream comprising paraffins and naphthenes; passing the light olefin depleted stream to a dehydrogenation reactor, thereby creating a third process stream with an increased level of olefins, wherein: the dehydrogenation reactor is part of a dehydrogenation reactor/regenerator system, the dehydrogenation reactor/regenerator system uses a short cycle time between 10 and 20 minutes, the regenerator provides heat for the dehydrogenation reactor, an FCC regenerator flue gas supplies heat to the regenerator, and the dehydrogenation reactor includes a catalyst comprising a metal on a support, wherein the metal is selected from the group consisting of Pt, Cr, Zr, a Zr—Cr blend, and mixtures thereof; and passing the third process stream to an olefin conversion reactor; wherein light olefins comprise ethylene and propylene.