METHOD OF PREPARING ACESULFAME SALTS AND DEVICE FOR CARRYING IT INTO EFFECT Russian patent published in 1998 - IPC

FIELD: chemical industry. SUBSTANCE: claimed method of preparing acesulfame salts comprises reacting amidosulfonic acid salts with dixetene to form acetoacetamidosulfonic acid salts of formula I: cyclizing by using at least about equimolar amount of SO₃. Said cyclization reaction is carried out in the presence of halogenated aliphatic hydrocarbon as inert solvent. The resulting product is treated with water and the resulting acesulfame-H of formula II is converted to non-toxic salt. The resulting crude solvent is distilled at standard pressure separation from water and low- boiling substances and regeneration of solvent which is rather pure to be reused for preparing compounds of formula I and/or II, the residue containing solvent, after distillation and further purification is recycled into reactor to carry out cyclization reaction. EFFECT: more efficient preparation method. 19 cl, 1 dwg