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Acesulfame 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, large production ratio error, unstable cryogenic load, etc., to optimize the reaction efficiency and improve the service life , the effect of increasing the economic benefits of the enterprise

Active Publication Date: 2013-06-05
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 stability of the reactor, resulting in unstable cryogenic load and large ice machine load
Intermittent production, low device utilization, high impurity content in finished products, and low product quality

Method used

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  • Acesulfame cyclization continuous production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, such as figure 1 Shown:

[0016] 1. Preparation of sulfur trioxide solution

[0017] 1.) Add dichloromethane (semi-finished product, moisture ≤0.05%) to the preparation kettle;

[0018] 2.) Start the circulating pump, circulate for 5 minutes, open the sulfur trioxide storage tank valve, and add sulfur trioxide to the preparation kettle;

[0019] 3.) After the feeding is completed, continue to circulate for 20 minutes, and pump the mixture of dichloromethane and sulfur trioxide into the high level metering tank of sulfur trioxide.

[0020] The intermediate tank contains intermediates (that is, the carboxylation product of the synthesis reaction: acetoacetamide-N-sulfonic acid triethylamine).

[0021] 2. Sulfonation reaction

[0022] 1.) Start the circulating pump, cool the material in the sulfonation reactor to below -30°C, and keep the liquid level of the material in the sulfonation reactor at 45-50 liquid level (if the material is not enough to circula...

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Abstract

The invention relates to an acesulfame cyclization continuous production method. The acesulfame cyclization continuous production method is characterized in that sulfonation reaction and hydrolysis reaction comprise the following steps: respectively dripping intermediates and sulfur trioxide generated in synthesis reaction into a sulfonation reaction kettle by a certain flow rate, conducting cooling in the sulfonation reaction kettle, and conducting primary reaction; reactants in the sulfonation reaction kettle automatically overflowing into a sulfonation liquid kettle after reaching a certain amount, and conducting spontaneous reaction; putting sulfonation liquid into a hydrolysis kettle after the spontaneous reaction, and meanwhile dripping acid water to conduct hydrolysis reaction. The acesulfame cyclization continuous production method has the advantages that cyclization continuous reaction process is adopted, continuity of production operation is achieved, and labor intensity of workers is reduced, besides, compared with traditional batch production process, stability of cyclization continuous reaction is high, service life of the reaction kettles is prolonged, cryogenic load is lightened, and production efficiency is greatly improved.

Description

Technical field: [0001] The invention relates to a continuous production method of acesulfame cyclization. Background technique: [0002] In the sulfonation section of the traditional acesulfame-K production process, intermediates and sulfur trioxide are dropped into 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 invention is exactly in order to overcom...

Claims

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Application Information

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IPC IPC(8): C07D291/06
Inventor 周睿程光锦沈晓峰
Owner ANHUI JINGHE IND
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