The present invention includes methods/processes and intermediates for preparing compounds having structural Formula (I):

##STR00001##

wherein X is alkyl, substituted alkyl, alkenyl, substituted alkenyl, heteroalkyl, substituted heteroalkyl, heteroalkenyl, or substituted heteroalkenyl.

The present invention includes methods/processes and intermediates for preparing compounds having structural Formula (I):

##STR00001##

wherein X is alkyl, substituted alkyl, alkenyl, substituted alkenyl, heteroalkyl, substituted heteroalkyl, heteroalkenyl, or substituted heteroalkenyl.

A process for producing a sulfamyl fluoride composition includes providing a solution comprising fluorosulfonic acid, urea and a solvent; reacting the solution at a reaction temperature from 80 C. to about 170 C. to produce a mixture including sulfamyl fluoride, bis(fluorosulfonyl) imide, ammonium fluorosulfate and the solvent; separating the ammonium fluorosulfate from the mixture; and separating the mixture into a sulfamyl fluoride composition and a recycle composition, the sulfamyl fluoride composition including a higher concentration of sulfamyl fluoride and bis(fluorosulfonyl) imide than the recycle composition. A mole ratio of the fluorosulfonic acid to the urea in the solution is from about 1.80:1 to about 2.00:1.

A process for producing a sulfamyl fluoride composition includes providing a solution comprising fluorosulfonic acid, urea and a solvent; reacting the solution at a reaction temperature from 80 C. to about 170 C. to produce a mixture including sulfamyl fluoride, bis(fluorosulfonyl) imide, ammonium fluorosulfate and the solvent; separating the ammonium fluorosulfate from the mixture; and separating the mixture into a sulfamyl fluoride composition and a recycle composition, the sulfamyl fluoride composition including a higher concentration of sulfamyl fluoride and bis(fluorosulfonyl) imide than the recycle composition. A mole ratio of the fluorosulfonic acid to the urea in the solution is from about 1.80:1 to about 2.00:1.

An electrolyte composition includes: a sulfonylimide compound represented by the following general formula (1) as an electrolyte salt; and an amidosulfuric acid component.
LiN(X.sup.1SO.sub.2)(X.sup.2SO.sub.2)(1) (where X.sup.1 and X.sup.2 are identical to or different from each other, and each represent a fluorine atom, an alkyl group with a carbon number of 1 to 6, or a fluoroalkyl group with a carbon number of 1 to 6).

A process for producing a sulfamyl fluoride composition includes providing a solution comprising fluorosulfonic acid, urea and a solvent; reacting the solution at a reaction temperature from 80 C. to about 170 C. to produce a mixture including sulfamyl fluoride, bis(fluorosulfonyl) imide, ammonium fluorosulfate and the solvent; separating the ammonium fluorosulfate from the mixture; and separating the mixture into a sulfamyl fluoride composition and a recycle composition, the sulfamyl fluoride composition including a higher concentration of sulfamyl fluoride and bis(fluorosulfonyl) imide than the recycle composition. A mole ratio of the fluorosulfonic acid to the urea in the solution is from about 1.80:1 to about 2.00:1.

A process for producing a sulfamyl fluoride composition includes providing a solution comprising fluorosulfonic acid, urea and a solvent; reacting the solution at a reaction temperature from 80 C. to about 170 C. to produce a mixture including sulfamyl fluoride, bis(fluorosulfonyl) imide, ammonium fluorosulfate and the solvent; separating the ammonium fluorosulfate from the mixture; and separating the mixture into a sulfamyl fluoride composition and a recycle composition, the sulfamyl fluoride composition including a higher concentration of sulfamyl fluoride and bis(fluorosulfonyl) imide than the recycle composition. A mole ratio of the fluorosulfonic acid to the urea in the solution is from about 1.80:1 to about 2.00:1.