Acesulfame potassium synthesis section acylation reaction process

Abstract

The invention discloses an acesulfame potassium synthesis section acylation reaction process. The process includes the following steps that a, a stirring machine of an acylation kiln and circulating cooling water flowing through a plate heat exchanger are started; b, objects obtained through the synthesis reaction of sulfamic acid and triethylamine are placed in an acylation kiln. C, dichloromethane and diketene with the volume ratio of 1 to 1 are evenly mixed, and a mixture of dichloromethane and diketene is dropwise added into the acylation kiln according to the ingredient amount, wherein the dropwise adding flow is 500 L / H; d, vaporized dichloromethane returns to a container for containing dichloromethane after passing through the plate heat exchanger, the mixture of dichloromethane and diketene is dropwise added into the acylation kiln, the acylation reaction temperature is raised, the reaction time is shortened, and the production efficiency is improved; meanwhile, dichloromethane is evaporated through the acylation reaction, evaporated dichloromethane is liquefied after being cooled through circulating cooling water, and liquefied dichloromethane returns to the container for containing dichloromethane to be recycled. The process is simplified, and the energy consumption is lowered.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to an acylation reaction process in the synthesis section of acesulfame potassium. Background technique [0002] Acesulfame K (potassium acetylsulfamate) is a food additive that is easily soluble in water and has the characteristics of not being metabolized or absorbed in the human body. It is an ideal sweetener for middle-aged and elderly people, obese patients, and diabetic patients. The synthesis section of the acesulfame potassium production process includes acylation reaction. Generally, in the acylation kettle, diethylene ketone is added dropwise according to the amount of ingredients to carry out the acylation reaction, but the flash point of diketene is 34°C, while The acylation reaction is an exothermic reaction, and high-concentration diketene is prone to safety accidents above 30°C. Therefore, in actual production, the reaction temperature must be lowered, the reaction ...

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Problems solved by technology

The synthesis section of the acesulfame potassium production process includes acylation reaction. Generally, in the acylation kettle, diethylene ketone is added dropwise according to the amount of ingredients to carry out the acylation reaction, but the flash point of diketene is 34°C, while The acylation reaction is an exothermic reaction, and high-concentration diketene is prone to safety accidents above 30°C. Therefore, in actual production, the reaction temperature must be lowered, the reaction time is increased, the reaction speed is slow, and the efficiency is low; in addition, shallow cooling must be used. Salt water cools the acylation tank, which increases the difficulty of the process

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