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:
Jun. 01, 2021
Filed:
Sep. 03, 2018
Applicants:
Covestro Deutschland Ag, Leverkusen, DE;
Zhangyong Ming, Shanghai, CN;
Inventors:
Wolfgang Taube, Neuss, DE;
Zhangyong Ming, Shanghai, CN;
Yiming Mao, Shanghai, CN;
Yuguo Gai, Shanghai, CN;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J 8/02 (2006.01); C01B 32/80 (2017.01); B08B 7/04 (2006.01);
U.S. Cl.
CPC ...
B01J 8/0278 (2013.01); B08B 7/04 (2013.01); B01J 2208/0007 (2013.01); B01J 2208/00707 (2013.01); B01J 2208/00805 (2013.01); B01J 2208/00946 (2013.01); B08B 2205/00 (2013.01); C01B 32/80 (2017.08);
Abstract
The invention relates to a method for cleaning a phosgene-conducting apparatus by pressurization with ammonia gas to constant pressure. In this way, phosgene residues in the apparatus to be cleaned are decomposed effectively.