US 11,987,756 B2
Process for PVC-containing mixed plastic waste pyrolysis in a reactor handling three phases of products
Ping Sun, Hinsdale, IL (US); and Pengfei Chen, Des Plaines, IL (US)
Assigned to UOP LLC, Des Plaines, IL (US)
Filed by UOP LLC, Des Plaines, IL (US)
Filed on Nov. 11, 2021, as Appl. No. 17/524,326.
Claims priority of provisional application 63/132,573, filed on Dec. 31, 2020.
Prior Publication US 2022/0204861 A1, Jun. 30, 2022
Int. Cl. C10G 1/00 (2006.01); C10G 1/10 (2006.01)
CPC C10G 1/002 (2013.01) [C10G 1/10 (2013.01); C10G 2300/1003 (2013.01); C10G 2300/202 (2013.01); C10G 2300/4006 (2013.01); C10G 2300/4012 (2013.01); C10G 2300/4018 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A process for pyrolysis of a mixed plastic waste stream comprising
a. sending the mixed plastic waste stream to a melting reactor to produce a first vapor stream that is chloride-rich and a first liquid stream;
b. sending said first liquid stream to a pyrolysis reactor to be heated to produce a second chloride rich vapor stream and a second liquid stream wherein said pyrolysis reactor has a configuration comprising two cylindrical ring structures, an inner cylindrical ring structure within an outer cylindrical ring structure wherein a circulation liquid supply stream enters said pyrolysis reactor tangentially relative to a ring edge of said two cylindrical ring structures and wherein solid particles move in a downward direction to a bottom of the pyrolysis reactor;
c. sending said first vapor stream to an incinerator to remove hydrocarbons, hydrogen chlorides and alkyl chlorides and then to a gas cleaning zone to remove chlorine compounds and to heat at least a portion of said circulation supply stream as a reaction heat supply for said pyrolysis reactor, wherein said gas cleaning zone comprises a catalyst bed to remove dioxin compounds and a vessel containing caustic compounds to neutralize HCl; and
d. cooling and separating said second vapor stream into a third vapor stream and a third liquid stream and then treating said third liquid stream in at least one adsorbent bed to remove chlorine containing impurities.