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:
Oct. 11, 2022
Filed:
Nov. 12, 2018
Applicant:
Lg Chem, Ltd., Seoul, KR;
Inventors:
Seung Won Choi, Daejeon, KR;
Sung Keun Jang, Daejeon, KR;
Eun Jung Joo, Daejeon, KR;
Young Ho Lee, Daejeon, KR;
Assignee:
LG CHEM, LTD., Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/14 (2006.01); C01B 33/158 (2006.01); C07C 29/80 (2006.01); B01D 3/42 (2006.01);
U.S. Cl.
CPC ...
C01B 33/1585 (2013.01); B01D 3/143 (2013.01); B01D 3/4205 (2013.01); C07C 29/80 (2013.01);
Abstract
Provided is a method for purifying a waste solvent by removing carbon dioxide contained in a waste solvent derived from supercritical waste liquid generated after supercritical drying by a decompression process, and removing ammonia by a multi-stage distillation process to obtain a solvent of high purity, which can be reused in producing silica aerogel or a silica aerogel blanket.