US 11,939,533 B2
Processes and systems for producing light olefins and aromatics from a mixed plastics stream
Aaron Chi Akah, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jun. 27, 2023, as Appl. No. 18/342,325.
Application 18/342,325 is a division of application No. 17/672,949, filed on Feb. 16, 2022, granted, now 11,760,938.
Prior Publication US 2023/0365870 A1, Nov. 16, 2023
Int. Cl. C10G 1/10 (2006.01); B01D 53/48 (2006.01); B01D 53/68 (2006.01); B01D 53/82 (2006.01); B01J 8/18 (2006.01); B01J 8/24 (2006.01); C10G 1/00 (2006.01); C10G 11/18 (2006.01)
CPC C10G 1/10 (2013.01) [B01D 53/48 (2013.01); B01D 53/685 (2013.01); B01D 53/82 (2013.01); B01J 8/1827 (2013.01); B01J 8/24 (2013.01); C10G 1/002 (2013.01); C10G 11/18 (2013.01); B01D 2251/304 (2013.01); B01D 2251/404 (2013.01); B01D 2251/602 (2013.01); B01D 2251/604 (2013.01); B01D 2251/606 (2013.01); B01D 2257/204 (2013.01); B01D 2257/30 (2013.01); C10G 2300/1003 (2013.01); C10G 2400/20 (2013.01); C10G 2400/30 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A system for processing mixed plastics into aromatics and light olefins, the system comprising:
an inlet stream comprising mixed plastics;
a dechlorination unit, the dechlorination unit in fluid communication with the inlet stream and operable to:
(i) raise the temperature of the inlet stream to a temperature between 250 and 350° C. to melt the mixed plastics and generate a liquid plastic stream; and
(ii) scrub HCl released from the inlet stream;
a pyrolysis reactor, the pyrolysis reactor in fluid communication with the liquid plastic stream discharged from the dechlorination unit and operable to raise the temperate of the liquid plastic stream to a temperature of 300 to 1,000° C. to generate hydrocarbon vapors;
an acid gas removal reactor, the acid gas removal reactor in fluid communication with the pyrolysis reactor and operable to remove residual HCl and sulfur-containing compounds from the hydrocarbon vapors to generate a plastic derived oil, where the acid gas removal reactor comprises a reaction vessel with a solid inorganic alkali salt disposed within the reaction vessel; and
a fluid catalytic cracking reactor with a solid cracking catalyst within the fluid catalytic cracking reactor, the fluid catalytic cracking reactor in fluid communication with the acid gas removal reactor and operable to crack the plastic derived oil to generate a product stream comprising light olefins having a carbon number of C2-C4 and aromatics.