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Method for extracting citric acid with ion exchange resin

An ion exchange resin and fiber extraction technology, applied in the separation/purification of carboxylic acid compounds, etc., can solve the problems of long exchange time, large resin volume, high loss rate, etc., achieve strong anti-pollution, simple treatment methods, and improve production efficiency effect

Inactive Publication Date: 2010-06-23
天津实发中科百奥工业生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the extraction and collection of citric acid mostly use macroporous ion exchange resin method, but macroporous ion exchange resin method requires large equipment, high cost, large resin volume, high loss rate, long exchange time and slow speed, and the processing speed is generally 1 ~4vv / h (vv / h represents the ratio of the volume of liquid flowing through the resin column to the volume occupied by the filler in the resin column within 1 hour), and the regeneration is slow, the amount of acid and alkali consumed is huge, and the pollution is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Coarse filtration of citric acid fermentation broth: pass the fermentation broth through a plate-and-frame filter pre-coated with diatomaceous earth to remove bacteria and impurities in the fermentation broth, circulate in the storage tank until the effluent is clarified, and collect Clear effluent.

[0017] (2) Refining filtration of citric acid fermentation broth: use an ultrafiltration membrane with a molecular weight of 6000 to circulate the feed liquid flowing out of the filter plate frame to remove macromolecular impurities.

[0018] (3) Adsorption: Pass the treated feed liquid into a resin column equipped with weakly basic ion-exchange resin fibers, wherein the ion-exchange resin fibers have a density of 0.1kg / L and a speed of 20vv / h.

[0019] (4) Elution: use 2 times of column volume to elute with 4% HCl at a speed of 5vv / h, collect the eluate, and the concentration of the eluate is 12.6%.

[0020] (5) Concentrate and crystallize the eluent to obtain solid ...

Embodiment 2

[0022] (1) Coarse filtration of citric acid fermentation broth: pass the fermentation broth through a plate-and-frame filter pre-coated with diatomaceous earth to remove bacteria and impurities in the fermentation broth, circulate in the storage tank until the effluent is clarified, and collect Clear effluent.

[0023] (2) Refining filtration of citric acid fermentation broth: use an ultrafiltration membrane with a molecular weight of 10,000 to circulate the feed liquid flowing out of the filter plate frame to remove macromolecular impurities.

[0024] (3) Adsorption: Pass the treated feed liquid into a resin column equipped with weakly basic ion exchange resin fibers, wherein the ion exchange resin fibers have a density of 0.18kg / L and a speed of 10vv / h.

[0025] (4) Elution: use 3 times of column volumes to elute with 6% ammonia water at a speed of 5vv / h, and collect the eluate with a concentration of 14.9%.

[0026] (5) Concentrate and crystallize the eluent to obtain ammo...

Embodiment 3

[0028] (1) Coarse filtration of citric acid fermentation broth: pass the fermentation broth through a plate-and-frame filter pre-coated with diatomaceous earth to remove bacteria and impurities in the fermentation broth, circulate in the storage tank until the effluent is clarified, and collect Clear effluent.

[0029] (2) Fine filtration of citric acid fermentation broth: use an ultrafiltration membrane with a molecular weight of 4000 to circulate the feed liquid flowing out of the filter plate frame to remove macromolecular impurities.

[0030] (3) Adsorption: Pass the treated feed liquid into a resin column equipped with strong basic ion exchange resin fibers, wherein the ion exchange resin fibers have a density of 0.10kg / L and a speed of 30vv / h.

[0031] (4) Elution: use 2 times column volume to elute with 4% NaOH at a speed of 10vv / h, collect the eluate, and the concentration of the eluate is 10.5%.

[0032] (5) Concentrate and crystallize the eluent to obtain solid sodi...

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Abstract

The invention relates to a method for extracting citric acid with ion exchange resin, which comprises the following steps: (1) prefiltering citric acid fermentation liquid: putting the fermentation liquid into a frame filter pre-coated with diatomite to remove thalli and impurities in the fermentation liquid, circulating in a storage tank until effluent liquid is clarified and collecting; (2) filtering citric acid fermentation liquid: treating the effluent liquid the thalli of which is removed through a ultrafiltration membrane with average molecular weight of 4 to 10K to remove the macromolecule impurities; (3) absorbing the citric acid in the fermentation liquid with ion exchange resin fibre: putting the treated liquid into the resin column with ion exchange resin fibre, wherein the filling density of the ion exchange resin fibre is 0.1 to 0.20 kg / L, and the speed thereof is 5 to 30 vv / h; (4) eluting citric acid absorbed by the ion exchange resin fibre: adopting HCI, ammonia water or NaOH with 2 to 3 times column volume and the concentration of 4 to 6 percent to elute with the speed of 5 to 10 vv / h, and collecting eluent; and (5) concentrating and crystallizing the treating fluid containing citric acid, and obtaining finished product. The invention has simple technology and obvious effect.

Description

technical field [0001] The invention relates to a method for extracting citric acid, in particular to a method for extracting citric acid with ion exchange resin fibers. Background technique [0002] Citric acid is an important organic acid, which is a colorless crystal. It often contains a molecule of crystal water, is odorless, has a strong sour taste, and is easily soluble in water. Citric acid is the largest acid among organic acids. Because of its physical properties, chemical properties, and derivative properties, it is the most important organic acid widely used in food, medicine, and daily chemical industries, and has a good impact on human health. . [0003] At present, the extraction and collection of citric acid mostly use macroporous ion exchange resin method, but macroporous ion exchange resin method requires large equipment, high cost, large resin volume, high loss rate, long exchange time and slow speed, and the processing speed is generally 1 ~4vv / h (vv / h ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/47
Inventor 徐勇虎国华刘晓鸥李睿颖王永乐许勤虎
Owner 天津实发中科百奥工业生物技术有限公司
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