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US 12,577,471 B2Granted
Process for the purification of waste plastics based oil with the help of basic compounds
AssigneeTotalenergies Onetech
InventorsBenjamin Biber, Christine Richardson, Delphine Minoux, Keith Nelson, Cindy Adam, Thomas Coustham
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Abstract
The disclosure relates to the purification and treatment of oil produced from the liquefaction of waste polymer like for instance the pyrolysis of waste plastics via the polymerization of dienes prior to further treatments.
Claims19
Process for the purification of liquified waste polymer comprising the following steps:
- a) providing a feedstream (1) containing liquified waste polymer, wherein said feedstream (1) contains at least 0.1 wt. % to at most 80 wt. % of dienes based on the total weight of said feedstream (1);
- c) performing a cationic polymerization reaction on said feedstream (1) under polymerisation conditions to obtain a first product stream (3) comprising an oligomeric product (33) wherein the cationic polymerization performed in the presence of an acidic catalyst;
- d) performing a neutralisation reaction by contacting said first product stream (3) with a basic compound (25) to obtain a neutralized product stream (4) and removing said basic compound from neutralized product stream (4) to obtain a purified liquified waste polymer (34);
- g) performing a separation to separate the oligomeric product (33) from the purified liquified waste polymer (34).
1 more element
Dependencies are inferred from the claim text.