US 12,227,710 B2
Processes and systems for formation of recycle-content hydrocarbon compositions
Michael Gary Polasek, Longview, TX (US); Daryl Bitting, Longview, TX (US); David Eugene Slivensky, Tatum, TX (US); and Xianchun Wu, Longview, TX (US)
Assigned to Eastman Chemical Company, Kingsport, TN (US)
Appl. No. 17/755,347
Filed by Eastman Chemical Company, Kingsport, TN (US)
PCT Filed Oct. 29, 2020, PCT No. PCT/US2020/057888
§ 371(c)(1), (2) Date Apr. 27, 2022,
PCT Pub. No. WO2021/087066, PCT Pub. Date May 6, 2021.
Claims priority of provisional application 62/928,475, filed on Oct. 31, 2019.
Prior Publication US 2022/0380692 A1, Dec. 1, 2022
Int. Cl. C10G 1/10 (2006.01); C10G 70/04 (2006.01)
CPC C10G 70/041 (2013.01) [C10G 1/10 (2013.01); C10G 2300/1003 (2013.01); C10G 2300/1092 (2013.01); C10G 2400/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process for separating methane and lighter components from an olefin-containing stream, said process comprising:
(a) introducing a column feed stream into a demethanizer column, wherein said column feed stream comprises a recycle content C2 to C4 olefin composition; and
(b) separating said column feed stream in said demethanizer column into an overhead stream enriched in methane and lighter components and a bottoms stream depleted in methane and lighter components,
wherein the ratio of the weight of methane and lighter components in said overhead stream to the total weight of ethylene and heavier component in said column feed stream is at least 0.1% higher than said column feed stream without said recycle content C2 to C4 olefin composition having the same mass flow rate, all other conditions of said demethanizer column being the same; wherein said column feed stream is produced from cracking a feedstock comprising a recycle content pyrolysis oil composition (r-pyoil) in at least one furnace coil of a cracker furnace to provide an olefin containing effluent; wherein said olefin-containing stream comprises a majority of ethylene and/or propylene; and wherein a portion of said olefin-stream is used to produce said column feed stream; and wherein said r-pyoil has not been hydrogenated.