The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 2020
Filed:
Jan. 11, 2018
Applicant:
Kureha Corporation, Chuo-ku, Tokyo, JP;
Inventors:
Assignee:
KUREHA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 75/0227 (2016.01); C08G 75/0259 (2016.01); C08G 75/0281 (2016.01);
U.S. Cl.
CPC ...
C08G 75/0227 (2013.01); C08G 75/0259 (2013.01); C08G 75/0281 (2013.01);
Abstract
Provided is a PAS production method and a PAS production apparatus wherein, in a gas-liquid system including a gas phase containing water, a dihalo aromatic compound, and hydrogen sulfide and a liquid phase containing a polar organic solvent and PAS, the dihalo aromatic compound and the hydrogen sulfide that can be volatilized at the time of dehydration from the gas phase can be recovered. The PAS production method according to the present invention includes: