US 11,788,015 B2
Method of producing selective naphtha oil through secondary pyrolysis of waste oil
Ka Young Kim, Daejeon (KR); Do Kyoung Kim, Daejeon (KR); Hee Soo Kim, Daejeon (KR); and Chang Q Lee, Daejeon (KR)
Assigned to SK Innovation Co., Ltd., Seoul (KR); and SK Geo Centric Co., Ltd., Seoul (KR)
Filed by SK Innovation Co., Ltd., Seoul (KR); and SK Geo Centric Co., Ltd., Seoul (KR)
Filed on Jun. 2, 2021, as Appl. No. 17/336,708.
Claims priority of application No. 10-2020-0067117 (KR), filed on Jun. 3, 2020; and application No. 10-2021-0044765 (KR), filed on Apr. 6, 2021.
Prior Publication US 2021/0380887 A1, Dec. 9, 2021
Int. Cl. C10G 1/10 (2006.01); C10G 1/00 (2006.01); C10G 11/05 (2006.01)
CPC C10G 1/10 (2013.01) [C10G 1/002 (2013.01); C10G 11/05 (2013.01); C10G 2300/1003 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of producing naphtha from mixed plastic, comprising the following steps:
(a) subjecting the mixed plastic to thermal pyrolysis and thereby producing a primary pyrolysis oil;
(b) separating the primary pyrolysis oil produced in the thermal pyrolysis into first oil having a boiling point of lower than 150° C. and comprising naphtha, and second oil having a boiling point higher than that of the first oil by fractional distillation;
(c) subjecting only the second oil to catalytic pyrolysis and thereby producing a catalytic pyrolysis product; and
(d) separating third oil having a boiling point of lower than 150° C. and comprising naphtha by subjecting the catalytic pyrolysis product produced in the step (c) to fractional distillation and mixing the separated third oil with the first oil to produce final oil comprising naphtha,
wherein the first oil and the second oil satisfy the following Relational Expression 1:
1<A1/A2<5  Relational Expression 11
wherein A1 is a content (wt %) of Cl in the first oil and A2 is a content (wt %) of Cl in the second oil.