Method for preparing a sulfonimide compound and salts thereof

摘要

The present invention relates to a method for preparing an aqueous sulfonimide compound of the formula (Rf1—SO2)(Rf2—SO2)NH, wherein Rf1 and Rf2 are independently selected from the group comprising: a fluorine atom and groups having 1 to 10 carbon atoms selected from the perfluoroalkyl, fluoroalkyl, fluoroalkenyl and fluoroallyl groups, from a mixture M1 including (Rf1—SO2)(Rf2—SO2)NH, Rf1SO2H and/or Rf2SO2H, Rf1SO2NH2 and/or Rf2SO2NH2, characterized in that said method includes an oxidation step of said mixture M1 using an oxidizing agent in order to obtain a mixture M2 including (Rf1—SO2)(Rf2—SO2)NH, Rf1SO3H and/or Rf2SO3H and Rf1SO2NH2and/or Rf2SO2NH2.

主权项

1. A process for preparing an aqueous solution of sulfonimide compound of formula (Rf1—SO2)(Rf2—SO2)NH, Rf1 and Rf2 being chosen, independently of each other, from the group consisting of: a fluorine atom and groups containing from 1 to 10 carbon atoms chosen from perfluoroalkyl, fluoroalkyl, fluoroalkenyl and fluoroallyl groups, the process comprising a step of oxidizing a mixture M1, wherein mixture M1 comprises (Rf1—SO2)(Rf2—SO2)NH, Rf1SO2H and/or Rf2SO2H, Rf1SO2NH2 and/or Rf2SO2NH2, with an oxidizing agent, to obtain a mixture M2 comprising (Rf1—SO2)(Rf2—SO2)NH, Rf1SO3H and/or Rf2SO3H, and Rf1SO2NH2 and/or Rf2SO2NH2.