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:
Aug. 03, 1993
Filed:
Jun. 12, 1992
Toru Nakazora, Ube, JP;
Toshihiro Nakamichi, Ube, JP;
Tuneyoshi Hisayuki, Ube, JP;
Katumi Takesita, Ube, JP;
Yutaka Katsuhara, Kawagoe, JP;
Central Glass Company, Limited, Yamaguchi, JP;
Abstract
A method for removing a perfluoroalkyl alcohol from a waste gas and recovering the perfluoroalkyl alcohol comprising the steps of bringing the waste gas into contact with an aqueous alkaline solution thereby to absorb the perfluoroalkyl alcohol into said solution and consequently obtain an aqueous alkaline solution containing an alkoxide of the perfluoroalkyl alcohol. Adding an acid to the aqueous alkaline solution containing the alkoxide of the perfluoroalkyl alcohol until the alkaline solution turns into an acidic solution with a pH value smaller than 5, thereby to turn said alkoxide into said perfluoroalkyl alcohol and subjecting the acidic solution to distillation to recover the perfluoroalkyl alcohol.