IP Library › Granted Patent US 12662638
Granted Patent B2
US 12662638 · App. 18/627,450 · Granted Jun 23, 2026

Method and system for producing refined hydrocarbons from waste plastics

Inventors: Sang Hwan Jo (Daejeon, KR); Yong Woon Kim (Daejeon, KR); Soo Kil Kang (Daejeon, KR); Ik Hwan Na (Daejeon, KR); Min Gyoo Park (Daejeon, KR); Min Woo Shin (Daejeon, KR); Seung Han Yu (Daejeon, KR); Jin Seong Jang (Daejeon, KR); Yong Seong Jeong (Daejeon, KR)
Assignee: SK INNOVATION CO., LTD.
C10G53/04B01D11/04B01D37/00B01D39/06B01J6/008C10B53/07C10G2300/1003C10G2400/06C10G2400/08C10G2400/30
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Quick Facts
Patent No.
US 12662638
App. No.
18/627,450
Granted
Jun 23, 2026
Kind
B2
Abstract

A method and associated system for producing refined hydrocarbons from waste plastics. The method and system provide for: pretreating waste plastics; producing pyrolysis gas by introducing the waste plastics pretreated in the pretreatment process into a pyrolysis reactor; producing in a lightening process pyrolysis oil by introducing the pyrolysis gas into a hot filter; and subjecting the pyrolysis oil to solvent extraction, wherein a liquid condensed in the hot filter is re-introduced into the pyrolysis reactor. The system produces refined hydrocarbons from the waste plastics.

Claims (17)

1 . A method for producing refined hydrocarbons from waste plastics, the method comprising:

pretreating waste plastics;

producing a pyrolysis gas by introducing the waste plastics pretreated in the pretreatment process into a pyrolysis reactor;

producing in a lightening process a pyrolysis oil by introducing the pyrolysis gas into a hot filter; and

subjecting the pyrolysis oil to solvent extraction,

wherein a liquid condensed in the hot filter is re-introduced into the pyrolysis reactor.

2 . The method of claim 1 , wherein the hot filter is filled with beads.

3 . The method of claim 2 , wherein the beads include at least one selected from the group consisting of silica sand (SiO 2 ) and aluminum oxide (Al 2 O 3 ).

4 . The method of claim 1 , wherein a temperature gradient is formed in the hot filter.

5 . The method of claim 4 , wherein the temperature gradient is formed by providing at least two heaters outside the hot filter.

6 . The method of claim 1 , wherein the pyrolysis reactor includes at least two batch reactors.

7 . The method of claim 6 , wherein the pyrolysis process is performed by a switching operation between the at least two batch reactors.

8 . The method of claim 1 , wherein the pyrolysis oil is mixed with petroleum hydrocarbons and solvent-extracted as a mixed oil.

9 . The method of claim 8 , wherein the pyrolysis oil is included in an amount of 90 wt % or less with respect to the total weight of the mixed oil.

10 . The method of claim 1 , wherein the waste plastics include at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polystyrene (PS).

11 . The method of claim 1 , further comprising, after the lightening process, a distillation process of distilling the pyrolysis oil.

12 . The method of claim 11 , wherein hydrocarbons derived from the pyrolysis oil separated in the distillation process and petroleum hydrocarbons are mixed and solvent-extracted as a mixed oil.