A kind of method for continuously preparing acesulfame potassium by microchannel 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: 2022-03-18
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, which is not conducive to the stability of the cyclization intermediate, which will lead to the decomposition of the intermediate and the reduction of the yield.
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[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 microchannel reactor, comprising the following steps: A, Interface B continuously enters the micro-reactor, and after fully reacting in the mixing section and the reaction section, in the same reactor and the water continuously entering from the interface C, after fully mixing and reacting in the mixing section and the reaction section, acesulfame is obtained from outlet D Acesulfame potassium is obtained after continuous extraction, continuous neutralization, continuous concentration, continuous drying and other separation processes for the reaction solution of acid. The DKA solution of the present invention completes the continuous cyclization and hydrolysis process with the cyclization agent and water in the same microreactor, and adjusts the ratio of raw materials for cyclization and hydrolysis by changing the combination of the mixing section and the reaction section of the microreactor. Control the temperature of the reaction materials in the microreactor and the residence time of the mixing and reaction section, and use the internal strong heat exchange to reduce side reactions.
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...
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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