US 11,905,466 B2
Circular economy for plastic waste to polyethylene via refinery FCC and alkylation units
Hye-Kyung Timken, Albany, CA (US)
Assigned to Chevron U.S.A. Inc., San Ramon, CA (US)
Filed by Chevron U.S.A. Inc., San Ramon, CA (US)
Filed on Oct. 30, 2022, as Appl. No. 18/051,001.
Application 18/051,001 is a continuation of application No. 17/131,845, filed on Dec. 23, 2020, granted, now 11,518,944.
Claims priority of provisional application 62/952,664, filed on Dec. 23, 2019.
Prior Publication US 2023/0079004 A1, Mar. 16, 2023
Int. Cl. C10G 1/10 (2006.01); C10B 53/07 (2006.01); C10G 1/00 (2006.01); C10G 11/18 (2006.01); C07C 2/76 (2006.01); C07C 4/04 (2006.01); C08F 10/02 (2006.01); C07C 2/54 (2006.01)
CPC C10G 1/10 (2013.01) [C07C 2/76 (2013.01); C07C 4/04 (2013.01); C08F 10/02 (2013.01); C10B 53/07 (2013.01); C10G 1/002 (2013.01); C10G 11/18 (2013.01); C07C 2/54 (2013.01); C10G 2300/1003 (2013.01); C10G 2300/202 (2013.01); C10G 2300/205 (2013.01); C10G 2300/304 (2013.01); C10G 2300/305 (2013.01); C10G 2400/02 (2013.01); C10G 2400/04 (2013.01); C10G 2400/08 (2013.01); C10G 2400/20 (2013.01); C10G 2400/22 (2013.01); C10G 2400/26 (2013.01)] 12 Claims
OG exemplary drawing
 
7. A process for converting waste plastic into useful chemicals comprising:
(a) selecting waste plastics containing polyethylene and/or polypropylene;
(b) pyrolyzing the waste plastics and recovering a pyrolysis oil and optionally wax comprising a naphtha/diesel fraction and a heavy fraction;
(c) passing the pyrolysis oil and wax from (b) to a refinery FCC unit along with virgin crude oil with volume flow of the pyrolysis oil comprising about 50 volume % or less of total hydrocarbon flow to the FCC unit;
(d) recovering a C3-C5 olefin/paraffin mixture from the FCC unit; and
(e) passing the C3-C5 olefin/paraffin mixture to a refinery alkylation unit.