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US 7,741,518 B2Granted
Method for producing trifluoromethanesulfonic anhydride
AssigneesMitsubishi Materials Corporation, Jemco Inc.
InventorsHiroyuki Yatsuyanagi, Hiroshi Koshiyama, Tsunetoshi Honda
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Abstract
This method for producing trifluoromethanesulfonic anhydride reacting trifluoromethanesulfonic acid with phosphorus pentoxide to produce trifluoromethanesulfonic anhydride, wherein hardening of the reaction solution due to polyphosphoric acid, which is produced as a byproduct, is prevented by using an excess amount of trifluoromethanesulfonic acid with respect to the phosphorus pentoxide.
Claims4
A method for producing trifluoromethanesulfonic anhydride, comprising:
- reacting trifluoromethanesulfonic acid with phosphorus pentoxide to produce trifluoromethanesulfonic anhydride,
- wherein an amount of the phosphorus pentoxide with respect to the trifluoromethanesulfonic acid in terms of mole ratio is 0.3 or less, thereby, hardening of the reaction solution due to polyphosphoric acid, which is produced as a byproduct, is prevented.
Dependencies are inferred from the claim text.