Integrated processes for producing bis(fluorosulfonyl) imide

A process for producing bis(fluorosulfonyl) imide, the process comprising:

• providing a solution comprising fluorosulfonic acid and urea, the solution maintained at a solution temperature from about 20° C. to about 50° C. and at a mole ratio of fluorosulfonic acid to urea of at least 2.5;
• reacting the solution in the presence of a reaction medium at a reaction temperature from about 100° C. to about 150° C. to produce a product stream including bis(fluorosulfonyl) imide, ammonium fluorosulfate and the reaction medium;
• separating the ammonium fluorosulfate from the product stream to produce an intermediate product stream;
• and
• separating the intermediate product stream into a concentrated product stream comprising bis(fluorosulfonyl) imide and a first recycle stream, the concentrated product stream including a higher concentration of bis(fluorosulfonyl) imide than the first recycle stream.