US 12,268,985 B2
Process for treating a gaseous effluent from pyrolytic decomposition of a polymer
Jean-Luc Dubois, Colombes (FR); Bruno De Caumia, Stoneham-et-Tewkesbury (CA); Daniel Blanchette, Levis (CA); and Christian Roy, Quebec (CA)
Assigned to ARKEMA FRANCE, Colombes (FR); and PYROVAC, Quebec (CA)
Appl. No. 17/286,168
Filed by ARKEMA FRANCE, Colombes (FR); and PYROVAC, Quebec (CA)
PCT Filed Oct. 18, 2019, PCT No. PCT/FR2019/052479
§ 371(c)(1), (2) Date Apr. 16, 2021,
PCT Pub. No. WO2020/079380, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 1859659 (FR), filed on Oct. 18, 2018.
Prior Publication US 2021/0387135 A1, Dec. 16, 2021
Int. Cl. B01D 53/14 (2006.01); B01D 53/72 (2006.01); C10B 53/07 (2006.01)
CPC B01D 53/1418 (2013.01) [B01D 53/1412 (2013.01); B01D 53/1431 (2013.01); B01D 53/1487 (2013.01); B01D 53/1493 (2013.01); B01D 53/72 (2013.01); B01D 2252/2021 (2013.01); B01D 2252/205 (2013.01); C10B 53/07 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A process for treating a gaseous effluent obtained from a pyrolytic decomposition of a polymer or of a polymer blend, for recovering one or more monomers contained in said gaseous effluent, said process comprising the following steps:
a condensation step which consists in injecting the gaseous effluent into a condensation chamber maintained at a first pressure p1, and in placing the gaseous effluent in contact with an absorbent liquid, the temperature of said absorbent liquid being below the temperature of the gaseous effluent, so that said monomer(s) condense(s) in the absorbent liquid by heat exchange,
a step of partial vaporization of a condensate obtained on conclusion of the condensation step, by expansion of the condensate in a second chamber maintained at a second pressure p2 below the first pressure p1,
a reinjection step which consists in at least partly redirecting a first liquid or vapor fraction, obtained on conclusion of the partial vaporization step, to the condensation chamber to once again absorb the monomer(s) contained in the gaseous effluent, and
a recovery step including purification of a second liquid or vapor fraction, obtained on conclusion of the partial vaporization step and charged with the monomer(s).