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Method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling crystallization

A technology of potassium sorbate and cooling crystallization, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc. It can solve uneven neutralization reactions, low product quality, and many by-products, etc. problems, to achieve the effect of reducing drying energy consumption, high product quality, and controllable reaction

Pending Publication Date: 2022-03-04
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a kind of method that liquid-liquid neutralization reaction continuous cooling crystallization produces Potassium Sorbate, to solve the inhomogeneous neutralization reaction that easily produces in the production process of Potassium Sorbate at present, many by-products, many solid wastes, And the product quality is not high

Method used

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  • Method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling crystallization
  • Method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling crystallization
  • Method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling crystallization

Examples

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Embodiment 1

[0038] (1) Take by weighing 100g sorbic acid and 550g 60% alcohol content aqueous solution and mix and dissolve continuously at 50°C. After dissolving, the mass concentration of sorbic acid is 15.4%; The acid solution and 500g of potassium hydroxide aqueous solution with a concentration of 10.1wt% were injected into the neutralization reactor for continuous neutralization reaction, the temperature of the neutralization reaction was 70°C, the reaction residence time was 3h, and the pH was maintained at 10.5 during the period;

[0039] (2) Press the flow rate of 9.9mL / min to squeeze the obtained potassium sorbate neutralization liquid into a two-stage continuous kettle formula crystallizer for continuous cooling and crystallization, and the pressure of the crystallization system is normal pressure, wherein, the crystallization temperature Control at 45°C, the crystallization residence time is 3h, the crystallization temperature of the secondary crystallizer is controlled at 13°C, a...

Embodiment 2

[0042] (1) The aqueous solution of 100g sorbic acid and 170g 60% acetone concentration is continuously mixed and dissolved at 70°C, and the mass concentration of sorbic acid after dissolving is 37%; The acid solution and 270g of 18.7wt% potassium hydroxide aqueous solution are continuously poured into the neutralization reactor for continuous neutralization reaction, the temperature of the neutralization reaction is 80°C, the reaction residence time is 1h, and the pH is maintained at 10.5 during the period;

[0043] (2) Press the flow rate of 11mL / min again and the potassium sorbate neutralization liquid that step (1) obtains is squeezed into two-stage continuous kettle type crystallizer and carries out continuous cooling and crystallization, and the pressure of crystallization system is normal pressure, and the primary crystallizer crystallization The temperature is controlled at 50°C, the crystallization residence time is 1.5h, the crystallization temperature of the secondary...

Embodiment 3

[0046] (1) 100g sorbic acid and 270g 45% acetone concentration aqueous solution are continuously mixed and dissolved at 70°C, and the mass concentration of sorbic acid after dissolving is 27%; % of sorbic acid solution and 200g 25.3wt% potassium hydroxide aqueous solution into the neutralization reactor for continuous neutralization reaction, the temperature of the neutralization reaction is controlled at 80 ° C, the residence time is 2h, and the pH of the neutralization reaction is maintained at 10 during the period;

[0047] (2) Press the flow rate of 10.8mL / min again the potassium sorbate neutralization liquid that above-mentioned step (1) obtains is squeezed into two-stage continuous tubular crystallizer and carry out continuous cooling and crystallization, and crystallization system pressure is normal pressure, and wherein, one-stage The crystallization temperature of the crystallizer is controlled at 47°C, and the crystallization residence time is 3h. The crystallization ...

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Abstract

The invention discloses a method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling crystallization, and belongs to the field of chemical engineering. The method comprises the following steps: dissolving sorbic acid in a mixed solvent to obtain a sorbic acid solution, respectively pumping the sorbic acid solution and a potassium hydroxide or potassium carbonate aqueous solution into a neutralization reactor for neutralization reaction to obtain a potassium sorbate solution, and then pumping the potassium sorbate solution into a two-stage crystallization reactor for continuous cooling crystallization, and finally, drying the crystallized moist potassium sorbate to obtain a potassium sorbate finished product, the mixed solvent is a mixed solvent composed of one or two of ethanol or acetone and water, and the concentration of ethanol or / and acetone is 10-80%. According to the method, sorbic acid is dissolved in the solution and subjected to liquid-liquid reaction with the potassium hydroxide solution, mixing is more uniform, the reaction is easy to control, potassium sorbate crystals in the obtained potassium sorbate finished product are in a regular particle shape, the content is larger than or equal to 99.8%, and the light transmittance is larger than or equal to 98.5%.

Description

technical field [0001] The invention relates to a method for producing potassium sorbate through liquid-liquid neutralization reaction and continuous cooling and crystallization, which belongs to the field of chemical industry. Background technique [0002] Potassium sorbate is one of several preservatives permitted by the WHO Committee on Additives. The two double bonds in potassium sorbate combine with the sulfhydryl group in the microbial enzyme system, which can destroy the microbial enzyme system, inhibit the reproduction of microorganisms, and achieve the purpose of antisepsis. Potassium sorbate is widely used in food, beverage, medicine, cosmetics and other fields because of its good antibacterial effect and safety. [0003] At present, the main preparation method of potassium sorbate in industrial production is: use crude product sorbic acid to react with potassium carbonate or potassium hydroxide solution to obtain potassium sorbate solution, and then add activated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C57/10C07C51/41C07C51/42C07C51/43
CPCC07C51/412C07C51/42C07C51/43C07C57/10
Inventor 朱小刚庆九俞新南刘芳
Owner NANTONG ACETIC ACID CHEM
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