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. 13, 2015
Filed:
Oct. 10, 2012
Central Glass Company, Limited, Ube-shi, Yamaguchi, JP;
Central Glass Company, Limited, Ube-shi, JP;
Abstract
Disclosed is a method for producing a Trifluoromethanesulfonic anhydride, which is characterized by that a reaction is conducted while kneading a Trifluoromethanesulfonic acid and diphosphorus pentoxide at a temperature that is 40° C. or higher and is lower than 100° C. by using a kneader-type reactor having a maximum power of 1.0 kW or greater per an actual capacity of 100 L and equipped with at least two-shaft blades, that the Trifluoromethanesulfonic anhydride to be generated is discharged, and that, while the residue in the reactor after the discharge is kneaded at a temperature that is 100° C. or higher and is lower than 140° C., the unreacted Trifluoromethanesulfonic acid is discharged, recovered and reused as the raw material. It is possible by this method to obtain a Trifluoromethanesulfonic anhydride with a high yield.