Method for producing bis(fluorosulfonyl)imide
View Patent ↗According to the method for producing bis(fluorosulfonyl)imide of the present invention, first, an unreacted mixed liquid is prepared by mixing a first fluorosulfonic acid with urea in a condition free of a chemical reaction between the first fluorosulfonic acid and urea. Then, the unreacted mixed liquid is dripped into a heated second fluorosulfonic acid or a heated bis(fluorosulfonyl)imide, allowing a chemical reaction between fluorosulfonic acid and urea to proceed. In this method, generation of carbon dioxide gas and heat during the chemical reaction can be controlled.
1. A method for producing bis(fluorosulfonyl)imide comprising the steps of:
preparing an unreacted mixed liquid by mixing a first fluorosulfonic acid with urea in a condition free of a chemical reaction between the first fluorosulfonic acid and the urea; and
dripping the unreacted mixed liquid into a heated second fluorosulfonic acid or a heated bis(fluorosulfonyl)imide so as to cause a chemical reaction between fluorosulfonic acid and urea to proceed.
2. A method for producing bis(fluorosulfonyl)imide according to claim 1 ,
wherein the temperature of the heated second fluorosulfonic acid or the heated bis(fluorosulfonyl)imide in the step of dripping ranges from 100° C. to 170° C.
3. A method for producing bis(fluorosulfonyl)imide according to claim 1 ,
wherein at least one member selected from the group consisting of bis(fluorosulfonyl)imide and bis(fluorosulfonyl)imide salt represented by a chemical formula (A) below is added to the second fluorosulfonic acid, and
M in the chemical formula (A) is a cation selected from the group consisting of Na, K, Li, and ammonium
(FSO 2 ) 2 N.M (A).
4. A method for producing bis(fluorosulfonyl)imide according to claim 1 ,
wherein an end reaction liquid that contains bis(fluorosulfonyl)imide is added to the second fluorosulfonic acid.
5. A method for producing bis(fluorosulfonyl)imide according to claim 3 ,
wherein an end reaction liquid that contains bis(fluorosulfonyl)imide is added to the second fluorosulfonic acid.
6. A method for producing bis(fluorosulfonyl)imide according to claim 2 ,
wherein at least one member selected from the group consisting of bis(fluorosulfonyl)imide and bis(fluorosulfonyl)imide salt represented by a chemical formula (A) below is added to the second fluorosulfonic acid, and
M in the chemical formula (A) is a cation selected from the group consisting of Na, K, Li, and ammonium
(FSO 2 ) 2 N.M (A).
7. A method for producing bis(fluorosulfonyl)imide according to claim 2 ,
wherein an end reaction liquid that contains bis(fluorosulfonyl)imide is added to the second fluorosulfonic acid.
8. A method for producing bis(fluorosulfonyl)imide according to claim 6 ,
wherein an end reaction liquid that contains bis(fluorosulfonyl)imide is added to the second fluorosulfonic acid.