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. 08, 1986
Filed:
Apr. 27, 1984
Yutaka Maruyama, Minami-dai, Kamifukuoka City, JP;
Junji Negishi, Suna-shinden, Kawagoe City, JP;
Katuyoshi Murata, Minami-dai, Kamifukuoka City, JP;
Yutaka Katsuhara, Suna-shinden, Kawagoe City, JP;
Other;
Abstract
A fluorinated carbonyl compound ##STR1## where x is 2 or 3 and A represents CF.sub.3 or H, coexisting with hydrogen fluoride in a mixed gas is purified by first adjusting the temperature of the mixed gas to 100.degree.-300.degree. C. to cause decomposition of a usually coexisting complex of the fluorinated compound with HF and then bringing the hot mixed gas into contact with concentrated sulfuric acid maintained at 10.degree.-40.degree. C. Almost the entire amount of HF is absorbed in sulfuric acid and subsequently recovered, while the purified compound neither dissolves in sulfuric acid nor reacts with HF present in sulfuric acid.