Acesulfame potassium compositions and processes for producing same
AssigneeCelanese International Corporation
InventorsChristoph Mollenkopf, Peter Groer, Arvind Yadav
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Abstract
Improved processes for producing high purity acesulfame potassium. In one embodiment, the process comprises the steps of contacting a solvent, e.g., dichloromethane, and a cyclizing agent, e.g., sulfur trioxide, to form a cyclizing agent composition and reacting an acetoacetamide salt with the cyclizing agent in the composition to form a cyclic sulfur trioxide adduct. The contact time is less than 60 minutes. The process also comprises forming from the cyclic sulfur trioxide adduct composition a finished acesulfame potassium composition comprising non-chlorinated, e.g., non-chlorinated, acesulfame potassium and less than 35 wppm 5-halo acesulfame potassium, preferably less than 5 wppm.
Claims39
A process for producing a finished acesulfame potassium composition, the process comprising:
- (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 the solvent and the cyclizing agent to form a cyclizing agent composition;
- (c) reacting an acetoacetamide salt with the cyclizing agent composition to form a cyclic sulfur trioxide adduct, wherein prior to being reacted with the acetoacetamide salt, the cyclizing agent composition has a temperature that is lower than the initial temperature of the cyclizing agent and/or the initial temperature of the solvent;
- and
- (d) forming from the cyclic sulfur trioxide adduct the finished acesulfame potassium composition comprising non-chlorinated acesulfame potassium and less than 35 wppm 5-chloro-acesulfame potassium;
- wherein contact time from the beginning of step (b) to the beginning of step (c) is less than 15 minutes.
Dependencies are inferred from the claim text.