Patent ID: 11969689
Assignee: NESTE OYJ
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A method for processing plastic waste pyrolysis gas, the method comprising:
a) providing a plastic waste pyrolysis gas stream wherein a temperature of the plastic waste pyrolysis gas stream is 300-500° C.;
b) transferring the plastic waste pyrolysis gas stream directly obtained from pyrolysis to a condensing means, wherein a temperature in the condensing means is 100-300° C.;
c) continuously wiping and/or scraping solidifying material from inner surfaces of the condensing means with a rotor to obtain a condensed fraction comprising waxy components including tar, char and solids, and a gaseous fraction;
d) collecting the condensed fraction by
transferring the condensed fraction to a first collecting means via a line at a temperature of 150-250° C. to yield a heavy product; and
condensing the gaseous fraction to produce a condensed liquid and non-condensable gases; separating the condensed liquid from the non-condensable gases and collecting the condensed liquid to yield a light product, wherein the step of condensing the gaseous fraction to produce the condensed liquid and non-condensable gases is conducted in a heat exchanger wherein the heat exchanger does not contain any wiping means or scraping means adapted to mechanically wipe or scrape inner surfaces of the heat exchanger.