公开(公告)号：EP3766920A1

公开(公告)日：2021-01-20

申请号：EP19830043.6

申请日：2019-07-04

申请人： LG CHEM, LTD.

发明人： LEE, Jeongbin ,  HAN, Joong Jin ,  PARK, Eunju ,  JO, Sanghwan

IPC分类号： C08G75/0204 ,  C08G75/0254 ,  C08G75/0236 ,  C08G75/0281

摘要： The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method with a high molecular weight at a high yield by optimizing the content and molar ratio of an amide-based compound in a polymerization step.

公开(公告)号：EP3766867A1

公开(公告)日：2021-01-20

申请号：EP19865996.3

申请日：2019-09-27

申请人： LG CHEM, LTD.

发明人： JO, Sanghwan ,  HAN, Joong Jin ,  KIM, Hansol

IPC分类号： C07D207/26 ,  B01D3/40 ,  C08G75/0204 ,  C08G75/0259 ,  C08G75/0281

摘要： The present disclosure provides a method and an apparatus for efficiently recovering an amide-based compound such as N-methyl-2-pyrrolidone from an aqueous solution containing an amide-based compound such as N-methyl-2-pyrrolidone.