US 12,296,504 B2
Pyrolysis method of waste plastics using batch reactor
Sanghwan Jo, Daejeon (KR); Sookil Kang, Daejeon (KR); Jaeheum Jung, Daejeon (KR); and Howon 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 May 10, 2024, as Appl. No. 18/660,732.
Application 18/660,732 is a continuation of application No. 18/040,844, previously published as PCT/KR2022/016526, filed on Oct. 27, 2022.
Claims priority of application No. 10-2021-0144394 (KR), filed on Oct. 27, 2021.
Prior Publication US 2024/0359368 A1, Oct. 31, 2024
Int. Cl. B29B 17/04 (2006.01); B29K 105/26 (2006.01)
CPC B29B 17/04 (2013.01) [B29B 2017/0496 (2013.01); B29K 2105/26 (2013.01)] 8 Claims
 
1. A pyrolysis method of waste plastics, the method comprising:
a) inputting waste plastics to a batch reactor and performing heating to produce a waste plastic melt at a first temperature of 50 to 150° C. for 20 to 300 minutes under an anaerobic atmosphere;
b) heating the waste plastic melt to remove chlorine from the melt at a second temperature of 220 to 300° C. for 120 to 360 minutes under an anaerobic atmosphere; and
c) heating the waste plastic melt from which chlorine has been removed to produce a pyrolysate at a third temperature of 300 to 600° C. under an anaerobic atmosphere,
wherein the batch reactor is sequentially heated in a direction from a raw material inlet to a reaction product outlet so that the temperature is raised from the first temperature to the third temperature.