Method for purifying sorbic acid

Abstract

The invention discloses a production technology for preparing high-purity sorbic acid by utilizing melt crystallization. The production technology comprises the following steps: firstly, filling frozen saline water into the bottom of an outer jacket of a melt crystallizer, wherein the frozen saline water evenly flows in a falling film manner on the outer wall of the crystallizer; after that, putting a coarse sorbic acid solution into the melt crystallizer, wherein the sorbic acid solution flows down in a falling film manner on the inner wall of the crystallizer so as to be gradually cooled and further crystallized; enabling a uniform crystal layer to gradually grow on the heat exchange surface, wherein the concentration of the crystal layer is higher than that of a mixture solution, and gradually enabling impurities to be enriched in the mixture solution; then, adjusting the temperature of hot water by using a heat exchanger, carrying out partial melting operation on the crystal layer so as to melt and remove low-melting-point impurities mixed in the crystal layer, and further purifying crystal. The method is simple in technology and compact in equipment structure, adopts a falling film form so as to reduce energy, and can reduce cost and equipment investment; the product produced by using the melt crystallizer is high in purity.

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...

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