Title:
PURIFICATION OF TRIFLUOROMETHANE SULFONIC ACID ANHYDRIDE
Document Type and Number:
Japanese Patent JP3456633
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for purifying trifluoromethane sulfonic acid anhydride useful as a raw material for producing medicines, agrochemicals, etc., capable of easily purifying the trifluoromethane sulfonic acid anhydride in a high purity and in a high yield by adding phosphoric acid.
SOLUTION: This method for purifying trifluoromethane sulfonic acid anhydride comprises adding (C) phosphoric acid to (B) the trifluoromethane sulfonic acid anhydride containing (A) phosphorus oxychloride and then subjecting the mixture to a distillation treatment. The component B containing the component A is preferably obtained by either of reactions expressed by formulas I and II. The component C is preferably added in an amount of ≥0.1 mole per mole of the component A at a temperature of ≤20°C. In order to enhance the effect for removing the component A, the mixture is preferably refluxed for about 30 min to about 1 hr and then distilled.purified. On the distillation, a distillation tower is preferably used.
Inventors:
Takanori Hamana
Shigenori Sakai
Kaoru Mori
Shigenori Sakai
Kaoru Mori
Application Number:
JP37400798A
Publication Date:
October 14, 2003
Filing Date:
December 28, 1998
Export Citation:
Assignee:
Central Glass Co., Ltd.
International Classes:
C07C303/44; C07C309/06; (IPC1-7): C07C303/44; C07C309/06
Domestic Patent References:
| JP9227498A | ||||
| JP2268148A | ||||
| JP200053634A |
Attorney, Agent or Firm:
Yoshiyuki Nishi
Previous Patent: LOW MELTING POINT GLASS FOR FORMING TRANSPARENT INSULATIVE COATING FILM
Next Patent: PRODUCTION OF TRIFLUOROMETHANE SULFONYL CHLORIDE
Next Patent: PRODUCTION OF TRIFLUOROMETHANE SULFONYL CHLORIDE