Method for producing crude sodium L-ascorbate by recovering crude vitamin C mother liquor

Abstract

The invention discloses a method for producing crude sodium L-ascorbate by recovering crude vitamin C mother liquor. The method comprises the steps of: destaining crude vitamin C mother liquor through a macroporous adsorption resin, concentrating, crystallizing and centrifuging a destaining solution to obtain a crude vitamin C mother liquor recovered product, crushing and drying the mother liquor recovered product through a micro powder drying machine, performing esterification reaction with methanol, controlling the burdening ratio of mother liquor recovered product (weight) to methanol (volume) in the esterification reaction of 1: 7, reacting for 4 hours, wherein the esterification reaction temperature at the first hour is 68 DEG C, the esterification reaction temperature at the second hour is 60 DEG C, the esterification reaction temperature at the third hour is 55 DEG C and the esterification reaction temperature at the fourth hour is 50 DEG C, adding sodium bicarbonate with stoichiometric amount to perform conversion reaction to obtain intermediate crude sodium L-ascorbate, and then changing over to the production process of normal vitamin C. The production yield and quality of the crude sodium L-ascorbate are improved, the problem of the accumulation of a mother liquor recovered product is solved, and the production process is simplified.

Description

technical field [0001] The invention relates to the technical field of vitamin C production, in particular to a method for recovering crude vitamin C mother liquor to produce crude vitamin C sodium. Background technique: [0002] In the production process of crude vitamin C, the mother liquor after separation of crude vitamin C contains a relatively large amount of gulong acid. The conventional treatment method is to directly process the mother liquor to obtain recycled products, which are mixed with raw materials in a certain proportion and then re-enter the production process. It may cause the long-term storage of the recovered product of the mother liquor, resulting in a decrease in quality, thereby affecting the production yield and product quality of vitamin C. Invention content: [0003] The purpose of the present invention is to provide a method for producing crude vitamin C sodium by recovering crude vitamin C mother liquor, which can improve the production yi...

AI Technical Summary

Problems solved by technology

May cause long-term storage of recovered mother liquor and lead to quality decline, thereby affecting vitamin C production yield and product quality