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:
Dec. 09, 2025
Filed:
Jul. 25, 2022
Lg Chem, Ltd., Seoul, KR;
Suk Yung Oh, Daejeon, KR;
Yong Heon Cho, Daejeon, KR;
Joo Sik Oh, Daejeon, KR;
Jun Seok Ko, Daejeon, KR;
Kyeong Hyeon Jo, Daejeon, KR;
Seung Whan Oh, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
A method for purifying of waste water includes: supplying a mixed stream, in which wastewater including water, a nitrile-based monomer, and ammonia and an acid component are mixed, to a first column; condensing an upper discharge stream of the first column, supplying the condensed stream to a decanter to separate the stream into a water layer and an organic layer, and supplying components of the organic layer to a second column; and separating a by-product from a lower discharge stream of the second column, and recovering the nitrile-based monomer from an upper discharge stream of the second column.