US 11,731,948 B2
Acesulfame potassium compositions and processes for producing same
Christoph Mollenkopf, Frankfurt am Main (DE); Peter Groer, Babenhausen (DE); and Arvind Yadav, Hessen (IN)
Assigned to Celanese International Corporation, Irving, TX (US)
Filed by Celanese International Corporation, Irving, TX (US)
Filed on Mar. 19, 2021, as Appl. No. 17/206,265.
Application 17/206,265 is a continuation of application No. 16/984,356, filed on Aug. 4, 2020, granted, now 10,975,047.
Application 16/984,356 is a continuation of application No. 16/684,761, filed on Nov. 15, 2019, granted, now 10,781,191, issued on Sep. 22, 2020.
Application 16/684,761 is a continuation of application No. 16/273,454, filed on Feb. 12, 2019, granted, now 10,590,098, issued on Mar. 17, 2020.
Application 16/273,454 is a continuation of application No. 16/014,552, filed on Jun. 21, 2018, granted, now 10,208,004, issued on Feb. 19, 2019.
Application 16/014,552 is a continuation of application No. 15/704,457, filed on Sep. 14, 2017, granted, now 10,023,546, issued on Jul. 17, 2018.
Claims priority of provisional application 62/397,540, filed on Sep. 21, 2016.
Prior Publication US 2021/0221780 A1, Jul. 22, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C07D 291/06 (2006.01); A23L 27/30 (2016.01); C07C 235/74 (2006.01)
CPC C07D 291/06 (2013.01) [A23L 27/30 (2016.08); C07C 235/74 (2013.01); A23V 2002/00 (2013.01)] 17 Claims
 
1. A process for producing a finished acesulfame potassium composition, the process comprising the steps of:
(a) providing a solvent at an initial temperature and a cyclizing agent at an initial temperature, wherein the cyclizing agent includes sulfur trioxide;
(b) contacting a solvent and a cyclizing agent to form a cyclizing agent composition;
(c) reacting an acetoacetamide salt with the cyclizing agent in the cyclizing agent composition to form a cyclic sulfur trioxide adduct;
(d) hydrolyzing the cyclic sulfur trioxide adduct to form an acesulfame-H composition comprising acesulfame-H;
(e) neutralizing the acesulfame-H in the acesulfame-H composition to form a crude acesulfame potassium composition comprising non-chlorinated acesulfame potassium and less than 35 wppm 5-chloro-acesulfame potassium; and
(f) forming the finished acesulfame potassium composition from the crude acesulfame potassium composition;
wherein the contact time from the beginning of step (b) to the beginning of step (c) is less than 60 minutes.