Clean productive process for extracting citric acid from citric acid fermentation liquid

Abstract

The present invention relates to a clean production process for extracting citric acid from citric acid fermented liuqor, includes the following steps: synthesizing weak-acid strong-base amphoteric resin specially used for adsorbing and separating citric acid, adopting fixed bed with said resin and using continuous cross-current temperature-changing chromatographic adsorption technique to make separation and purification from the fermented liquor so as to obtain clean and pure citric acid product. Under the condition of low temp. the fermented liquor is passed through the resin bed, the citric acid can be adsorbed, and then the hot water can be used, and passed through the saturated resin bed, so the citric acid can be desorbed. It uses heat difference as power for elution, so it does not used acid, does not use alkali and orgnaic solvent chemical product.

Description

technical field

[0001] The invention relates to a clean production process for extracting citric acid from citric acid fermentation liquid without pollution, and relates to a method for separating and purifying fermented organic acid products. It can also be used in the separation and purification of other fermented organic acid products, such as malic acid and lactic acid. Background technique

[0002] In recent years, the scale of citric acid production in my country has developed rapidly, and the annual output has reached 400,000 tons. The production of citric acid in the world adopts fermentation method, and the fermented mash contains various impurities, which must be purified by a series of physical and chemical methods. The purification process currently used in industry is the calcium salt precipitation method. Because the process uses a large amount of calcium carbonate and sulfuric acid, there will be a large amount of by-product calcium sulfate waste residue, ca...

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