Acesulfame potassium cyclization continuous production method

A production method, the technology of acesulfame K, applied in the direction of organic chemistry, etc., can solve the problems of low temperature stability of the reactor, unstable cryogenic load, large production ratio error, etc., to optimize the reaction efficiency and shorten the production cycle , the effect of increasing production capacity

Active Publication Date: 2014-03-05
ANHUI JINGHE IND
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Problems solved by technology

Because of intermittent production, human operation leads to large production ratio errors, resulting in low conversion rate, high production cost, serious waste of raw materials, and low temperature st

Method used

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  • Acesulfame potassium cyclization continuous production method
  • Acesulfame potassium cyclization continuous production method

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Embodiment Construction

[0017] Such as figure 2 Shown, a kind of acesulfame cyclization continuous production method provided by the invention comprises the following steps:

[0018] 1) At the same time inject 4800kg of sulfur trioxide and 14400kg of methylene chloride into the first mixer for mixing. The reaction between dichloromethane and sulfur trioxide is negligible, and the temperature after mixing is around 24°C.

[0019] 2) Pump 6300kg of synthetic intermediates (about 1 kettle carboxylation product), specific gravity 1.24-1.26, volume 5000L, together with sulfur trioxide and dichloromethane solution from the first mixer into the second mixer, Rapid reaction in the second mixer, the temperature of the reactor is 80-110°C, the reaction time is 0.2s, the pressure is 0.6-0.9MPa, the material is sprayed from the second reactor into the sulfonation tank in the form of mist, and the injection flow rate is 0.9m / s. The sulfonation reaction is carried out at the outlet of the second mixer, the re...

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Abstract

The invention relates to an acesulfame potassium cyclization continuous production method. The method is characterized in that the sulfonation reaction and hydrolysis reaction comprise the following steps: step a, separately pumping an intermediate generated during a synthesis reaction and sulfur trioxide into a sulfonation reactor in a certain speed, carrying out sulfonation reactions in the sulfonation reactor; step b, gasifying dichloromethane when the concentration of the reactants in the sulfonation reactor reach a certain level, spraying the sulfonation liquid into a hydrolysis reactor; step c, dropwise adding acidic water into the hydrolysis reactor to carry out hydrolysis reactions. The method has the advantages that an cyclization one-step reaction technology is adopted, thus the continuity of production operation is realized, and the work strength of workers is reduced; compared to the conventional intermittent production technology, the one-step reaction method has a higher stability, improves the service life of the reactor, shortens the reaction time, and reduces the side reactions. Furthermore, in the method, the sulfonation reaction temperature is raised, then dichloromethane gasification is utilized to reduce the reaction temperature, so that low temperature production is avoided, and a deep cooling ice machine is stopped, so the production efficient is greatly improved, and the energy consumption is largely reduced.

Description

Technical field: [0001] The invention relates to a one-step production method of acesulfame-sulfur. Background technique: [0002] The sulfonation section in the traditional acesulfame potassium production process such as figure 1 As shown, the intermediate and sulfur trioxide are added dropwise to the sulfonation reactor at a certain flow rate for reaction. After the reaction is completed, they are transferred to the hydrolysis tank for hydrolysis reaction. Because of intermittent production, human operation leads to large production ratio errors, resulting in low conversion rate, high production cost, serious waste of raw materials, and low temperature stability of the reactor, resulting in unstable cryogenic load and large ice machine load . The production is intermittent, the utilization rate of the device is low, the impurity content in the finished product is high, and the product quality is not high. Invention content: [0003] The purpose of the present inventio...

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Application Information

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IPC IPC(8): C07D291/06
CPCC07D291/06
Inventor 王从春祁飞
Owner ANHUI JINGHE IND
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