Process for the recycling and cracking waste plastics based oil

Process for a 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 polymerization reaction on said feedstream (1) under polymerization conditions to obtain a first product stream (3) comprising an oligomeric product (33) wherein the cationic polymerization is performed in the presence of an acidic catalyst;
• d) optionally, performing a neutralization 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 second product stream (5);
• g) performing a separation to separate the oligomeric product (33) from the purified liquified waste polymer (34);
• and
• k) performing a cracking reaction wherein said purified liquified waste polymer (34) is cracked on a catalyst being a 10 MR or 12 MR molecular sieve at a temperature ranging from 450° C. to 650° C., a total pressure ranging from 0.5 to 10 barg and/or with an hydrogen partial pressure ranging from 0 to 7.5 barg to crack the olefins and/or paraffins of said purified liquified waste polymer into olefins having 2 to 4 carbon atoms.