Title:
METHOD FOR RECOVERING AMIDE-BASED COMPOUNDS
Document Type and Number:
WIPO Patent Application WO/2020/159167
Kind Code:
A1
Abstract:
The present invention provides a method for recovering amide-based compounds, wherein, before a distillation step for separating and recovering amide-based compounds from waste liquid including amide-based compounds such as N-methyl-2-pyrrolidone generated in a polyarylene sulfide polymerization process and inorganic salts, the inorganic salts are removed from the waste liquid by using a decanter-type centrifuge at room temperature and normal pressure, and thus the occurrence of clogging by fine PPS powder, which may be generated in the distillation step, and the inorganic salts or distillation efficiency deterioration is prevented, and accordingly, amide-based compounds such as N-methyl-2-pyrrolidone in the waste liquid are efficiently recovered.
Inventors:
JO SANGHWAN (KR)
HAN JOONG JIN (KR)
KIM HANSOL (KR)
HAN JOONG JIN (KR)
KIM HANSOL (KR)
Application Number:
PCT/KR2020/001208
Publication Date:
August 06, 2020
Filing Date:
January 23, 2020
Export Citation:
Assignee:
LG CHEMICAL LTD (KR)
International Classes:
C07D207/267; C07C231/24; C07C233/03; C07D233/30
Foreign References:
| KR20050087860A | 2005-08-31 | |||
| JP2011111548A | 2011-06-09 | |||
| JP2003275773A | 2003-09-30 | |||
| JPH0593068A | 1993-04-16 | |||
| KR20130026454A | 2013-03-13 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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