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:
Feb. 02, 2021
Filed:
Apr. 22, 2019
Applicant:
Mitsubishi Chemical Corporation, Chiyoda-ku, JP;
Inventors:
Kouji Teramoto, Tokyo, JP;
Hitoshi Nishimura, Tokyo, JP;
Assignee:
Mitsubishi Chemical Corporation, Chiyoda-ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 231/24 (2006.01); B01D 3/14 (2006.01); B01D 3/26 (2006.01); C07C 233/18 (2006.01); B01D 3/00 (2006.01);
U.S. Cl.
CPC ...
C07C 231/24 (2013.01); B01D 3/009 (2013.01); B01D 3/143 (2013.01); B01D 3/26 (2013.01); C07C 233/18 (2013.01);
Abstract
A method for purifying an N-(α-alkoxyethyl)formamide contained in a mixture thereof with a plurality of distillation columns, the plurality of distillation columns being arranged serially, the method including condensing a distillate from the second or any later-stage distillation column to obtain a condensate and returning at least some of the condensate to the preceding distillation column.