Recrystallization production method for citric acid

Abstract

The invention provides a recrystallization production method for citric acid, which comprises the following steps that: citric acid fermented liquor is subjected to bacteria removal and impurity removal to form clear citric acid liquor; the clear citric acid liquor is subjected to primary condensation and crystallization to form crude citric acid crystals; the crude citric acid crystals are dissolved, decolorized, desalted, secondarily concentrated and crystallized to obtain citric acid crystals; and the secondary concentrated and crystallized mother liquor returns to the primary condensation process. The method has the advantages that the method has stable product quality, high product yield, and little accessory consumption, concentrates byproducts into sugar feed, reduces the discharge amount of CO2, and has no wastewater discharge, and the like.

Description

Technical field [0001] The invention relates to a citric acid recrystallization production method, in particular to a method for extracting and separating citric acid in a fermentation broth by using a concentrated crystallization method, 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 large country producing citric acid, with more than 20 production plants and an output of more than 700,000 tons. The extraction methods of citric acid at home and abroad are mainly calcium salt method, chromatography method, membrane separation method and extraction method. [0003] The disadvantages of the calcium salt process are that the neutralization process is operated intermittently, with poor operating conditions, high labor intensity, and low level of automation; second, the intermediate quality is unstable, which is not conducive to process control...

AI Technical Summary

Problems solved by technology

[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 control; the third is that the equipment investment is large and the operating cost High; Fourth, high consumption of auxiliary materials, about 0.85 tons of sulfuric acid and 0.85 tons of calcium carbonate per ton of citric acid; Fifth, about 2 tons of solid waste calcium sulfate per ton of citric acid

[0004] The disadvantages of the chromatography process are: first, the high investment in equipment and auxiliary facilities; second, the pre-treatment of materials is more complicated, consumes a lot of money, and costs a lot

[0005] The disadvantages of electrodialysis are: first, high investment in equipment and auxiliary facilities; second, high power consumption and high production costs

[0006] The disadvantages of the extraction method are: first, the product quality is poor; second, the product cannot be used in the food and pharmaceutical industries due to the residue of the extractant