Chromatographic separation method for citric acid

Abstract

The invention provides a chromatographic separation method for citric acid, which comprises the following steps: removing bacteria and impurities from citric acid fermented liquor to obtain clear citric acid liquor; decolorizing and desalting the clear liquor; then feeding the clear liquor to an ion exclusion chromatographic system; treating the clear liquor by water or dilute acid as an eluting agent to obtain citric acid solution; and removing impurities, concentrating and crystallizing the citric acid solution to obtain citric acid crystals. The method has the advantages of stable product quality, high product yield, little accessory consumption, no calcium sulphate discharge, and the like.

Description

technical field

[0001] The invention relates to a method for extracting citric acid, in particular to a method for extracting and separating citric acid in fermented liquid by chromatography, and belongs to the field of food chemical industry. Background technique

[0002] Citric acid is an organic acid widely used in beverage, food and pharmaceutical industries. my country is a major producer of citric acid, with more than 20 production plants, and the output has exceeded 550,000 tons. The extraction methods of citric acid at home and abroad are mainly calcium salt method, adsorption method, membrane separation method and extraction method.

[0003] The disadvantages of the calcium salt process are: first, the neutralization process is intermittently operated, the operating conditions are poor, the labor intensity of the workers is high, and the automation level is low; the second is that the quality of the intermediate product is unstable, which is not conducive to process...