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Method for purifying sorbic acid

A technology of pure sorbic acid and sorbic acid, applied in the separation/purification of carboxylic acid compounds, etc., can solve the problems of poor appearance of sorbic acid, equipment needs to be improved, and irritating odor, etc., and achieve good parallel reaction selectivity and safety The effects of reliability, cost reduction and equipment investment, and stable quality

Inactive Publication Date: 2017-07-14
于银强
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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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Abstract

The invention discloses a production method for preparing highly pure sorbic acid by using melt crystallization. The method comprises the following steps: introducing frozen brine to the bottom of the outer jacket of a melting crystallizer, allowing the frozen brine to uniformly flow on the outer wall of the crystallizer in a falling film manner, adding a crude sorbic acid solution into the melting crystallizer, allowing the sorbic acid solution to flow on the inner wall of the crystallizer in a falling film manner to carry out gradual cooling for crystallization, gradually growing a uniform crystal layer on a heat exchange surface, and gradually enriching impurities in a mixture solution, wherein the concentration of the crystal layer is higher than the concentration of the mixture solution; and partially melting the crystal layer by adjusting the temperature of hot water through a heat exchanger to partially melt and eliminate low-melting point impurities included in the crystal layer in order to further purify crystals. The method has the advantages of simple process, compact device structure, reduction of the energy through adopting a falling film form, reduction of the cost and the device investment, and realization of high purity of the product produced by using the melting crystallizer.

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 于银强
Owner 于银强
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