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Citric acid mother liquor treatment process

A treatment process, citric acid technology, applied in the direction of adsorption water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that easy carbides and other impurities cannot be removed, and mother liquor cannot be obtained Effectively deal with problems such as unacceptable by customers, to achieve the effect of reducing the amount of unqualified mother liquor, huge economic and environmental significance, and saving consumption

Inactive Publication Date: 2010-06-30
RIZHAO LUXIN JINHE BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the concentrated sulfuric acid in this method carbonizes a part of the residual sugar and other easy-carbon substances in the mother liquor, it also causes some complicated chemical reactions to occur in the mother liquor, and the products produced have peculiar smell, which is unacceptable to customers; in addition, this method It is also impossible to remove easy carbides and other impurities. In the end, there is still a considerable amount of mother liquor that cannot be effectively treated, and eventually needs to be returned to the neutralization process.

Method used

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  • Citric acid mother liquor treatment process
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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take the unqualified citric acid mother liquor and make it into a concentration of 800L of 40% (w / w). At room temperature, add powdered activated carbon as a coagulant in an amount of 1.5‰ of the volume of the citric acid mother liquor (that is, 1.2 kg), and start stirring for 2 minutes. Finally, add an acrylamide flocculant with a concentration of 1‰ (w / w) in an amount of 1.0% of the volume of the citric acid mother liquor (that is, 8 liters) as a degumming agent, mix and let stand for 2 hours before the mother liquor is separated. Take out the supernatant, process the precipitate with a centrifuge, and combine the supernatant with the supernatant taken out earlier, which is the mother liquor for citric acid purification.

[0020] Concentrate the purified mother liquor obtained above to 76% (w / w), put it into a crystallization pot for cooling and crystallization, and then centrifuge and dry to obtain the product.

Embodiment 2

[0022] Take unqualified citric acid mother liquor and make it into 50% (w / w) concentration of 700L, press 2.5kg / m at 30°C 3 Add perlite as a coagulant aid, start stirring, and after 5 minutes, the volume of the mother liquor is 45g / m 3 Chitosan was added as a degumming agent in an amount of 3 hours after mixing and the mother liquor was layered. Take out the supernatant, process the precipitate with a centrifuge, and combine the supernatant with the supernatant taken out earlier, which is the mother liquor for citric acid purification.

[0023] Concentrate the purified mother liquor obtained above to 80% (w / w), put it into a crystallization pot for cooling and crystallization, and then centrifuge and dry to obtain the product.

Embodiment 3

[0025] Get unqualified citric acid mother liquor to be mixed with the concentration 800L of 20% (w / w), press 4.5kg / m under room temperature 3 Add the coagulant diatomaceous earth in the amount of the added amount, start stirring, and after 2 minutes, the volume of the mother liquor is 5g / m 3 Add the mixture of commonly used acrylamide flocculant and chitosan with a weight fraction of 7:3 as a degumming agent, mix well and let it stand for 2 hours. Take out the supernatant, process the precipitate with a centrifuge, and combine the supernatant with the supernatant taken out earlier, which is the mother liquor for citric acid purification.

[0026] Concentrate the purified mother liquor obtained above to 76% (w / w), put it into a crystallization pot for cooling and crystallization, and then centrifuge and dry to obtain the product.

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Abstract

The invention provides a citric acid mother liquor treatment process, which is characterized in that citric acid mother liquor is treated by coagulant acid and degumming agent, filtered and crystallized again to obtain a qualified product, or the treated mother liquor is further purified through a continuous moving bed simulating process and the treated citric acid mother liquor is transferred into the product at last. By using the embodiment of the technology, the crystallization ratio and the yield rate of the product can be improved and the unqualified liquor amount can be reduced on one hand, and on the other hand, the citric acid mother liquor does not have to be returned to a counteract procedure, which both saves the consumption of calcium carbonate and sulfate acid and achieves the clean production.

Description

technical field [0001] The invention relates to a citric acid production process, in particular to a citric acid mother liquor treatment process. Background technique [0002] Citric acid is one of the main metabolites of organisms and has a wide range of uses. my country is the world's largest producer of citric acid, with an annual output of about 800,000 tons. Citric acid is generally produced by submerged fermentation and purified by calcium salt extraction. The calcium salt extraction method not only consumes non-renewable resources such as calcium carbonate and sulfuric acid, but also produces calcium sulfate waste residue and carbon dioxide waste gas to pollute the environment. At the same time, every ton of citric acid product will produce about 15% unqualified mother liquor. These mother liquors contain impurities such as residual sugar, colloid, pigment, miscellaneous acids, inorganic cations, insoluble solids, etc., and cannot be directly extracted without treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F9/02C02F1/38C02F1/56C07C51/43C02F1/42C07C59/265
Inventor 寇光智任守会楼良旺韦兰芬
Owner RIZHAO LUXIN JINHE BIOCHEM
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