Sulfonation reaction cooling method in acesulfame synthesis technology

Abstract

The invention discloses a sulfonation reaction cooling method in an acesulfame synthesis technology. The method is characterized in that liquid ammonia is adopted to replace copious cooling brine and enters a heat exchanger as a cooling agent to directly cool a sulfonation kettle, and the temperature in the sulfonation kettle is controlled by regulating the flow of the liquid ammonia so as to meet the temperature requirement of sulfonation reaction. The method has the advantages that based on the characteristics of low specific gravity and low boiling point of the liquid ammonia, heat generated in sulfonation reaction is taken away through sublimation of the liquid ammonia so as to achieve cooling. Compared with an existing cooling method, restrictions on production from brine pumps are eliminated, the usage quantity of brine pumps is reduced, and a large amount of electric energy is saved; the purchase and installation cost and the repair and maintenance cost of brine tanks and dry evaporative cooling equipment are lowered, annual calcium chloride consumption and soft water consumption are reduced, and influences on the environment in the overhaul process are eliminated.

Description

technical field [0001] The invention relates to the field of acesulfame K synthesis technology, in particular to a cooling method for sulfonation reaction in the acesulfame K synthesis technology. Background technique [0002] The sulfonation section is the main section that affects the yield of acesulfame potassium, and the reaction in this section needs to be carried out below -30°C to ensure the smooth progress of the reaction. The sulfonation section of the traditional acesulfame production process such as figure 1 As shown, the temperature in the kettle is controlled by cooling the temperature of cryogenic brine (more than 30% calcium chloride solution). The cryogenic brine enters the heat exchanger through the brine pump, and the cold loss is large during the control process. Indirect control is not conducive to production regulation. The efficiency of the water pump is greatly affected. This project uses the characteristics of low specific gravity and low boiling po...

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Problems solved by technology

[0003] Aiming at the disadvantages of large cold loss in the control process of the existing cooling method and being greatly affected by the efficiency of the brine pump, the present invention provides a cooling method for the sulfonation reaction in the synthesis process of acesulfame potassium, which eliminates the restriction of the brine pump on production and reduces the amount of salt The use of water pumps saves a lot of electricity

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