초록 ▼

Processing scheme and arrangement for increasing the relative yield of light olefins involves integration of the cracking a heavy hydrocarbon feedstock to produce an effluent comprising a range of hydrocarbon products including C4-C7 olefins and the subsequent cracking at least a portion of the C4-C

Processing scheme and arrangement for increasing the relative yield of light olefins involves integration of the cracking a heavy hydrocarbon feedstock to produce an effluent comprising a range of hydrocarbon products including C4-C7 olefins and the subsequent cracking at least a portion of the C4-C7 olefins to produce additional light olefins.

대표청구항 ▼

1. An integrated system for cracking a heavy hydrocarbon feedstock to produce an effluent comprising a range of hydrocarbon products including C5 olefins and for cracking C5 olefin hydrocarbon products to produce C2 and C3 olefins, said integrated system comprising: a fluidized catalytic cracking re

1. An integrated system for cracking a heavy hydrocarbon feedstock to produce an effluent comprising a range of hydrocarbon products including C5 olefins and for cracking C5 olefin hydrocarbon products to produce C2 and C3 olefins, said integrated system comprising: a fluidized catalytic cracking reactor wherein the heavy hydrocarbon feedstock contacts a hydrocarbon cracking catalyst at hydrocarbon cracking reaction conditions to produce a hydrocarbon effluent comprising a range of hydrocarbon products including C5 olefins;a separator to separate the hydrocarbon effluent to form a wet gas stream comprising C5 and lighter hydrocarbons;a first compressor to compress the wet gas stream;a gas concentration system wherein the compressed wet gas stream is processed to at least separately concentrate and remove C2 paraffinic hydrocarbon products, concentrate and recover C3 and C4 hydrocarbon products and separate C5 olefin hydrocarbon products;an olefin cracking reactor wherein at least a portion of the C5 olefin hydrocarbon products are cracked to form a cracked olefin effluent comprising C2-C4 hydrocarbons including C2 and C3 olefins;a first return line wherein at least a portion of the cracked olefin effluent is introduced into the first compressor and subsequently processed through the gas concentration system; anda cracked olefin effluent separation system effective to separate the cracked olefin effluent into a vapor stream comprising C2 and C3 olefins, a liquid stream comprising C4 hydrocarbons and a third stream comprising C5 hydrocarbons. 2. The system of claim 1 wherein at least a portion of the vapor stream is introduced into the first compressor via the first return line. 3. The system of claim 1 additionally comprising a second return line wherein at least a portion of the liquid stream is introduced into the gas concentration system at a point subsequent to the first compressor. 4. The system of claim 1 additionally comprising an olefin cracking reactor return line wherein at least a portion of the third stream C5 hydrocarbons are returned to the olefin cracking reactor. 5. The system of claim 1 wherein the C5 olefin hydrocarbon products cracked in the olefin cracking reactor consist essentially of n-C5 olefin hydrocarbon products.