Patent ID: 7829701

Claim:
A process of carrying out sulfonation cyclization to reduce the leakage of a sulfonating reagent during continuous production of the salts of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2,-dioxide comprising the steps of: (a) injecting a sulfonation raw material and a sulfonating reagent into a reactor, wherein said sulfonation raw material and sulfonating reagent are dissolved in an organic solvent to provide a reaction mixture of the sulfonation raw material and sulfonating reagent; (b) removing a portion of the reaction mixture from the reactor; (c) cooling the removed portion of the reaction mixture of the sulfonation raw material and sulfonating reagent separate from the reaction mixture remaining in the reactor; and (d) combining the cooled portion of the reaction mixture with the reaction mixture remaining in the reactor while maintaining a vortex of the reaction mixture remaining in the reactor to avoid the need for stirring to continue continuous production of salts of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2,-dioxide by sulfonation cyclization.