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:
Jul. 29, 2025
Filed:
Apr. 29, 2024
Daikin Industries, Ltd., Osaka, JP;
Takahiro Taira, Osaka, JP;
Tadao Hayashi, Osaka, JP;
Chiaki Okui, Osaka, JP;
Ryou Hatayama, Osaka, JP;
Michinobu Koizumi, Osaka, JP;
Taketo Kato, Osaka, JP;
Yuuji Tanaka, Osaka, JP;
Hirotoshi Yoshida, Osaka, JP;
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Abstract
A method for removing a fluorine-containing compound from discharge water, which includes bringing discharge water containing two or more fluorine-containing compounds represented by the following general formula (1) or (2) into contact with an adsorbent so as to adsorb the two or more fluorine-containing compounds:(H—(CF)—COO)M General Formula (1):wherein m is 3 to 19, Mis H, a metal atom, NR, where Ris the same or different and is H or an organic group having 1 to 10 carbon atoms, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and p is 1 or 2;(H—(CF)—SO)M General Formula (2):wherein n is 4 to 20; Mis H, a metal atom, NR, where Ris the same as above, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and q is 1 or 2.