A kind of method of purifying sorbic acid

A technology of sorbic acid and crude sorbic acid, which is 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, so as to improve the selection of parallel reactions The effects of stability, quality stability, good parallel reaction selectivity and safety

Active Publication Date: 2015-09-30
NANTONG ALCHEMY BIOTECH DEV
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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, and the calcium chloride solution flows uniformly on the outer wall of the melting crystallizer as 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 c...

Embodiment 2

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

[0020] (1) Crystallization: First, pour -6°C sodium chloride solution at the bottom of the outer jacket of the melting crystallizer, and the sodium 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 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 cryst...

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 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 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 crystal ...

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Abstract

The invention discloses a production process for preparing high-purity sorbic acid by virtue of a melt crystallizer. The production process comprises the following steps: introducing freezing saline water into the bottom of a jacket of the melt crystallizer, enabling the freezing saline water to uniformly flow at the outer wall of the crystallizer in a falling film manner, putting a coarse sorbic acid solution into the melt crystallizer, enabling the coarse sorbic acid solution to flow down manner at the inner wall of the crystallizer in the falling film so as to be gradually cooled and crystallized, gradually growing a uniform crystal layer on a heat exchanging face, and gradually enriching impurities in a mixture solution, wherein the concentration of the uniform crystal layer is higher than that of the mixture solution; regulating the temperature of hot water by utilizing a heat exchanger to carry out partial melting operation, and partially melting and eliminating low-melting-point impurities included in the crystal layer, so as to further purify crystals. The method has the advantages that the process is simple, and the structures of devices are compact; by utilizing the falling film manner, the energy is reduced, and meanwhile, the cost and the equipment investment are lowered; the purities of products produced by utilizing the melt crystallizer are 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 salt can inhibit the growth of mold and have been used as a food preservative for a long time, especially at low pH values, it can be used as an undissociated acid to preservative. 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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/10C07C51/43
CPCC07C51/43C07C57/10
Inventor 许卫东卞杨伟
Owner NANTONG ALCHEMY BIOTECH DEV
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