Preparation method of acesulfame potassium

Abstract

The invention discloses a preparation method of acesulfame potassium, which comprises the following steps: adding triethylamine into a sulfamic acid solution, and carrying out amination reaction to generate an ammonium sulfamic acid salt solution; adding diketene into the obtained ammonium sulfamate solution, and carrying out acylation reaction under the action of a solid superacid catalyst to obtain an intermediate solution; dissolving sulfur trioxide in a solvent to form a cyclizing agent solution; adding a cyclizing agent solution into the intermediate solution, and carrying out sulfonation cyclization reaction to obtain a cyclization product solution; adding a hydrolytic agent into the cyclization product solution, and carrying out hydrolysis reaction to obtain a hydrolysate solution; and adding a potassium hydroxide solution into the organic phase of the hydrolysate solution to obtain acesulfame potassium. According to the method, the content of impurities in the acesulfame potassium can be reduced, so that the acesulfame potassium is better in condition, the conversion rate of the raw materials is increased, the yield of a cyclization product is increased to a great extent, further, the yield of the final product acesulfame potassium is increased, and the production cost of the acesulfame potassium is reduced.

Description

technical field [0001] The invention belongs to the technical field of fine chemical manufacturing, and in particular relates to a preparation method of acesulfame potassium. Background technique [0002] Acesulfame potassium (acesulfame potassium), also known as AK sugar, is a widely used sugar substitute food additive. Its appearance is white crystalline powder. As an organic synthetic salt, its taste is similar to sugarcane, and it is easily soluble in water. , Slightly soluble in alcohol, its chemical properties are stable, and it is not easy to break down and fail; it does not participate in the body's metabolism and does not provide energy; it has high sweetness and low price; it has no cariogenicity; it has good stability to heat and acid. [0003] At present, in the synthesis of acesulfame potassium, the diketene-sulfur trioxide method is widely used. The specific reaction steps include: reacting sulfamic acid with amine to form amine sulfamic acid salt, and then rea...

AI Technical Summary

Problems solved by technology

Because the reaction time is long, the cyclization product is easy to decompose, the yield of the hydrolysis reaction is low, and the finished product yield of acesulfame potassium is low, and the quality of the finished product is relatively poor

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