US 12,187,609 B2
Purification of bis(fluorosulfonyl) imide
Matthew H. Luly, Hamburg, NY (US); and Bernard E. Pointner, Buffalo, NY (US)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Jan. 27, 2022, as Appl. No. 17/585,990.
Application 17/585,990 is a continuation of application No. 16/842,646, filed on Apr. 7, 2020, granted, now 11,267,707.
Claims priority of provisional application 62/834,815, filed on Apr. 16, 2019.
Prior Publication US 2022/0144638 A1, May 12, 2022
Int. Cl. C01B 21/093 (2006.01)
CPC C01B 21/093 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method of producing purified bis(fluorosulfonyl) imide, the method comprising:
reacting urea with fluorosulfonic acid to form a first liquid mixture comprising bis(fluorosulfonyl) imide and unreacted fluorosulfonic acid;
contacting the first liquid mixture with gaseous ammonia, wherein the gaseous ammonia reacts with the fluorosulfonic acid to produce a second liquid mixture comprising ammonium fluorosulfate; and
separating the ammonium fluorosulfate from the second liquid mixture.