Method for continuously preparing acesulfame potassium through micro-channel reactor

A technology of acesulfame potassium and microchannel reactor, which is applied in the chemical industry and can solve the problems of intermediate decomposition and yield reduction, which are not conducive to the stability of cyclization intermediates, etc.

Active Publication Date: 2020-07-07
NANTONG ACETIC ACID CHEM +1
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Problems solved by technology

[0017] The process of cyclization and hydrolysis is carried out separately, and the cascading and step-by-step cyclization and hydrolysis are carried out, whi

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  • Method for continuously preparing acesulfame potassium through micro-channel reactor
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  • Method for continuously preparing acesulfame potassium through micro-channel reactor

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Embodiment Construction

[0045] The present invention mainly aims at the intermittent synthesis of acesulfame potassium, and the problems of low yield, high energy consumption and high production cost in the process of cyclization and hydrolysis, and develops a method for continuously preparing acesulfame potassium through a microchannel reactor .

[0046] Its main process is as follows:

[0047] 1. The preparation of the acetoacetamidosulfonic acid triethylamine salt (DKA) solution is a continuous process.

[0048] 2. The DKA solution and the cyclizing agent continuously enter the microreactor through the A and B interfaces of the microreactor, and after the full reaction of the mixing section and the reaction section, in the same reactor with the water continuously entering from the C interface, After fully mixing and reacting in the mixing section and the reaction section, the reaction solution of acesulfame is obtained from outlet D for continuous extraction.

[0049] 3. The feed ratio of the DK...

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Abstract

The invention belongs to the field of chemical production, and provides a method for continuously preparing acesulfame potassium through a micro-channel reactor. The method comprises the following steps: enabling an acetoacetamido sulfonic acid triethylamine salt solution and a cyclizing agent continuously to enter the micro-reactor through interfaces A and B of the micro-reactor; after full reaction of the mixing section and the reaction section, carrying out full mixing reaction with water continuously entering from the interface C in the same reactor through the mixing section and the reaction section to obtain a reaction solution of acesulfamic acid from the outlet D, and carrying out separation processes such as continuous extraction, continuous neutralization, continuous concentration and continuous drying to obtain acesulfame potassium. The DKA solution, the cyclizing agent and the water are subjected to continuous cyclization and hydrolysis processes in the same micro-reactor;by changing and combining the mixing section and the reaction section of the micro-reactor, the ratio of cyclization and hydrolysis raw materials is adjusted, the temperature of reaction materials inthe micro-reactor and the residence time of the reaction materials in the mixing and reaction sections are controlled, and the side reaction is reduced by utilizing internal strong heat exchange.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for continuously preparing acesulfame potassium through a microchannel reactor. Background technique [0002] Acesulfame potassium, Chinese name: acesulfame potassium, A-K sugar, English name: Acesulfame Potassium, appearance properties: colorless or white, odorless, crystalline powder with strong sweet taste; solubility: easily soluble in water, slightly Soluble in ethanol, CAS number: 55589-62-3, molecular formula: C 4 h 4 KNO 4 S [0003] Structural formula: Molecular weight: 201.2, melting point (°C): 225, density: 1.81 (g / cm 3 ), [0004] Acidity (1% w / v aqueous solution): PH5.5~7.5. [0005] Function and use: Acesulfame K has a wide range of uses and can be used as a sweet source in all foods and beverages. Because it is stable to acid and heat, it is more suitable for acidic beverages and foods that require high temperature sterilization and b...

Claims

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Application Information

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IPC IPC(8): C07D291/06
CPCC07D291/06
Inventor 庆九俞新南薛金全朱小刚刘芳
Owner NANTONG ACETIC ACID CHEM
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