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

A citric acid fermentation broth and citric acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., to achieve the effects of reducing operators, shortening the production process, and saving production sites

Inactive Publication Date: 2002-07-17
俞铮 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the method of the present invention is to make the process a process that reduces costs and improves production yield, and it is particularly important to thoroughly eradicate environmental pollution in the production process.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] Example 1 Oil Phase A

[0041] Styrene 40 g; Acrylic acid 50 g; Divinylbenzene 15 g (82%);

[0042] Isoheptane 45g; Benzoyl peroxide 1g Water Phase B

[0043] 180 grams of water; 40 grams of sodium chloride; 0.3 grams of sodium carboxymethylcellulose; 15 drops of 1% methylene blue

[0044] Slowly add the oil phase A into the water phase B under stirring, and adjust the stirring speed until the oil phase forms droplets of the desired size in the water phase. Then slowly raise the temperature to 75-80°C, and react under heat preservation. After 5 hours, the product was filtered and washed thoroughly, and dried in vacuum at 100° C. to obtain 98 g of the product, with a yield of 93.3%.

[0045] The product obtained was in the form of beige round particles with an anion exchange capacity of 3.8 meq / g dry resin.

example 2

[0047] Quaternization of the resin obtained in Example 1: add 10 grams of the product to a mixed solution of 8 milliliters of dichloroethane and 10 milliliters of methyl chloride ether, soak at 30°C for 3 hours; cool down to about 25°C, add 8 grams of chlorine Zinc, heat up to 45°C and keep it warm; after 8 hours, cool down to room temperature, filter out the mother liquor, wash with water until pH = 2-3, and then air-dry for several hours; add 15 ml of acetone, then control the temperature below 40°C, and add 20 Milliliter trimethylamine aqueous solution was adjusted to pH = 11, and kept at 30°C for 6 hours; after the reaction was completed, it was filtered and washed with water until neutral to obtain 122 g of the product.

[0048] The product obtained was in the form of dark brown round particles with an anion exchange capacity of 4.9 meq / g dry resin.

example 3

[0049] Example 3 Oil Phase A

[0050] Styrene 40 g; Vinyl acetate 50 g; Divinylbenzene 15 g (82%);

[0051] Benzoyl Peroxide 1 g Water Phase B

[0052] 150 grams of water; 30 grams of sodium chloride; 0.25 grams of sodium carboxymethylcellulose; 10 drops of 1% methylene blue

[0053] The synthesis conditions are as in Example 1, and the product yield is 95.3%.

[0054] The product obtained was in the form of off-white round particles with an anion exchange capacity of 4.3 meq / g dry resin.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/47
CPCC07C51/47
Inventor 俞铮彭奇均
Owner 俞铮
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