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Recrystallization production method for citric acid

A production method, citric acid technology, applied in the field of food chemical industry, can solve the problems of high operating cost, high consumption of auxiliary materials, unstable quality of intermediate products, etc.

Active Publication Date: 2012-09-19
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The recrystallization production method of citric acid comprises the steps:

[0032] 1. Will be 2.0m 3 The fermented mash with a citric acid concentration of 15% was filtered through a plate and then treated with a roll-type ultrafiltration membrane with a molecular weight cut-off of 20,000 Daltons to obtain a citric acid clear liquid with a concentration of 14% of 2.058m 3 .

[0033] 2. The supernatant is concentrated to a citric acid concentration of 20% through a nanofiltration membrane with a molecular weight cut-off of 500 Daltons and an RO membrane combination system, and then the material is concentrated to a citric acid concentration of more than 90% by thermal concentration.

[0034] 3. Carry out solid-liquid separation after the concentrated solution is cooled and crystallized to obtain 147 kilograms of citric acid crude crystals and 180 liters of primary crystallization mother liquor with a concentration of 86%.

[0035] 4. After 147 kg of crude crystals we...

Embodiment 2

[0039] The recrystallization production method of citric acid comprises the steps:

[0040] 1. 5 liters of primary crystallization mother liquor that embodiment 1 step 3 produces is diluted with water to concentration 15% and then reacts with calcium carbonate and calcium hydroxide, controls reaction temperature 80 ℃, and reaction terminal pH6.5.

[0041] 2. The reaction solution is subjected to solid-liquid separation to obtain calcium citrate and waste sugar solution. The waste sugar solution can be made into concentrated sugar feed.

[0042] 3. Calcium citrate is reacted with sulfuric acid, the reaction temperature is controlled at 80° C., the reaction end point is pH 2.0, and the reaction solution is separated to obtain citric acid and calcium sulfate.

[0043] 4. The citric acid solution is concentrated and crystallized after decolorization and desalination, and 2.4 kilograms of citric acid crystals and 2 liters of mother liquor with a concentration of citric acid of 80%...

Embodiment 3

[0046] The recrystallization production method of citric acid comprises the steps:

[0047] 1. 50 liters of primary crystallization mother liquors produced in step 3 of embodiment 1 are continuously entered into the simulated moving bed system filled with D318 anion exchange resin and stably operated to obtain 60 liters of waste sugar solution.

[0048] 2. 120 liters of 35% solution of citric acid was obtained after the saturated resin was eluted with sulfuric acid, and 17.64 kg of 98% sulfuric acid was consumed.

[0049] 3. The citric acid solution is concentrated and crystallized after activated carbon decolorization and anion-cation exchange resin desalination treatment and isolates 26 kilograms of citric acid crystals and 23.3 liters of citric acid concentration as a mother liquor of 75%.

[0050] 4. Citric acid crystals enter the drying and packaging process to produce citric acid products.

[0051] 5. 60 liters of waste sugar liquid that step 1 produces mixes with 180 k...

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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 production method for recrystallization of citric acid, in particular to a method for extracting and separating citric acid in fermentation broth by means of a concentrated crystallization method, which 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 700,000 tons. The extraction methods of citric acid at home and abroad are mainly calcium salt method, chromatography, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/265C07C51/43
Inventor 李荣杰尚海涛潘声龙
Owner ANHUI BBCA FERMENTATION TECH ENG RES