Process for the recycling of waste plastics based oil

A process for the purification of a liquified waste polymer to obtain a purified based oil, the process comprising:

• a) providing a feedstream (1) containing the liquified waste polymer, wherein said feedstream (1) contains at least 0.1 wt. % to at most 80.0 wt. % of dienes based on the total weight of said feedstream (1);
• c) performing a polymerization reaction on said feedstream (1) to obtain a first product stream (3) comprising an oligomeric product (33) and the liquified waste polymer, wherein the polymerization reaction is a cationic polymerisation performed in presence of an acidic catalyst;
• d) optionally performing a neutralization reaction of the first product stream (3) with a basic compound to obtain a neutralized product stream (4) and removing said basic compound from neutralized product stream (4) to obtain a second product stream (5);
• g) performing a separation to separate the oligomeric product (33) from the liquified waste polymer to obtain a purified liquified waste polymer (34);
• and
• i) performing a hydrotreating step on the purified liquified waste polymer (34) at a temperature of at least 200° C. to obtain a hydrotreated stream (9) being a purified based oil.