Method of purifying sorbic acid

A technology of pure sorbic acid and sorbic acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of sorbic acid with poor appearance, pungent smell, and equipment needs to be improved, and achieve good parallel reaction options Performance and safety, stable quality, cost reduction and equipment investment effect

Inactive Publication Date: 2015-12-30
张勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the equipment for large-scale production of sorbic acid at home and abroad is a general enamel reaction kettle. The mature process of the process is as follows: that is, the condensation reaction of ketene and crotonaldehyde under the action of a catalyst, followed by hydrolysis, drying, packaging and other processes The finished product is obtained, but because the sorbic acid produced by this process has a poor appearance, many impurities and a pungent smell
Therefore existing technology and equipment of this sorbic acid need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The technology of melting crystallizer purification sorbic acid comprises the steps:

[0016] (1) Crystallization: first pass calcium chloride solution at -8°C at the bottom of the outer jacket of the melting crystallizer, the calcium chloride solution flows evenly on the outer wall of the melting crystallizer in a falling film, and then put the condensed sorbic acid solution into into the melting crystallizer, and at the same time through the melting crystallizer air duct using a compressor to 4m 3 The compressed air fed into the sorbic acid solution at a speed of 1 / min makes it form a slug-like flow bubble in the crystallization tube to rise, causing the turbulence of the melt, enhancing the mass transfer and heat transfer performance, and the sorbic acid solution drops on the inner wall of the crystallizer. The film flows down, gradually cools and crystallizes, and gradually grows a uniform crystal layer on the heat exchange surface. The concentration of the crystal ...

Embodiment 2

[0019] The technology of melting crystallizer purification sorbic acid comprises the steps:

[0020] (1) Crystallization: first pass sodium chloride solution at -6°C at the bottom of the outer jacket of the melting crystallizer, and the sodium chloride solution flows uniformly in a falling film on the outer wall of the melting crystallizer, and then put the condensed sorbic acid solution into into the melting crystallizer, and at the same time through the melting crystallizer air duct using a compressor to 5m 3 The compressed air fed into the sorbic acid solution at a speed of 1 / min makes it form a slug-like flow bubble in the crystallization tube to rise, causing the turbulence of the melt, enhancing the mass transfer and heat transfer performance, and the sorbic acid solution drops on the inner wall of the crystallizer. The film flows down, gradually cools and crystallizes, and gradually grows a uniform crystal layer on the heat exchange surface. The concentration of the cry...

Embodiment 3

[0023] The technology of melting crystallizer purification sorbic acid comprises the steps:

[0024] (1) Crystallization: first pass calcium chloride solution at -2°C at the bottom of the outer jacket of the melting crystallizer, the calcium chloride solution flows uniformly on the outer wall of the melting crystallizer in a falling film, and then put the condensed sorbic acid solution into into the melting crystallizer, and at the same time through the melting crystallizer air duct using a compressor to 7m 3 The compressed air fed into the sorbic acid solution at a speed of 1 / min makes it form a slug-like flow bubble in the crystallization tube to rise, causing the turbulence of the melt, enhancing the mass transfer and heat transfer performance, and the sorbic acid solution drops on the inner wall of the crystallizer. The film flows down, gradually cools and crystallizes, and gradually grows a uniform crystal layer on the heat exchange surface. The concentration of the cryst...

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PUM

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Abstract

The invention discloses a production process for preparing high-purity sorbic acid by utilizing melt crystallization. The production process comprises the following steps: first introducing chilled brine into the bottom of a melt crystallizer outer jacket, facilitating the chilled brine to uniformly flow on the outer wall of the crystallizer in a falling film manner, then putting a crude sorbic acid solution into a melt crystallizer, gradually cooling the sorbic acid solution to be crystallized under the condition that the sorbic acid solution flows down in a falling-film manner on the inner wall of the crystallizer, gradually growing a uniform crystal layer on a heat exchanging surface, wherein the concentration of the crystal layer is higher than that of a mixture solution, and gradually gathering impurities into the mixture solution; partially melting the crystal layer by adjusting the temperature of hot water via a heat exchanger, melting and eliminating partial low-melting-point substances mingled in the crystal layer, and further purifying crystal. The method is simple in process, equipment is compact in structure, a falling film form is adopted, the energy is reduced, and meanwhile the cost and equipment investment are reduced; the purity of a product produced by utilizing the melt crystallizer is high.

Description

technical field [0001] The invention relates to a method for purifying sorbic acid, in particular to a method for purifying sorbic acid with a melting crystallizer. Background technique [0002] Sorbic acid and its potassium salts can inhibit the growth of mold, and have been used as food preservatives for a long time, especially at low pH values, they can act as undissociated acids for preservatives. Sorbic acid has the characteristics that other preservatives do not have, that is, it has strong antiseptic selectivity. It can inhibit the growth of bacteria harmful to humans, but it is harmless to bacteria beneficial to humans. For example, it can inhibit the growth of cheese mold but does not Does not affect the growth of bacteria that help cheese ripen. Therefore, in the food industry, sorbic acid is widely used as a preservative for cheese, cakes and other pastries. Mainly used for mildew prevention of cheese, pickled vegetables, dried fruit, fruit juice, fruit syrup, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/43C07C57/10
CPCC07C51/43C07C57/10
Inventor 张勇
Owner 张勇
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