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Method for extracting refined citric acid from citric acid fermentation liquid

A citric acid fermentation broth, citric acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of citric acid cost, product quality and environmental impact, so as to save acid and alkali consumption and prevent agglomeration , The effect of stable production quality

Active Publication Date: 2010-07-21
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a new process for extracting and refining citric acid from citric acid fermentation liquid, to overcome the deficiencies in the prior art, and to solve problems such as cost, product quality and environmental impact in the citric acid production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for extracting refined citric acid from citric acid fermentation broth, comprising the following steps in turn:

[0025] Preparation of citric acid fermentation liquid: Aspergillus niger was used to convert starch saccharification liquid into citric acid through submerged fermentation.

[0026] 1. Ceramic membrane dialysis sterilization: the fermentation acidity of the citric acid fermentation liquid is 14%. After filtering through a ceramic membrane (pore size 0.05 μm), the amount of dialyzed water is 15% of the volume of the citric acid fermentation liquid. The final dialysate of the ceramic membrane is citric acid The content of citric acid is 0.45%, and the yield of citric acid is 99.5%. The concentrated solution of the ceramic membrane is directly sent to the tube bundle dryer to dry and produce animal feed.

[0027] 2. Powder carbon decolorization: the powder carbon used in the decolorization process is zinc chloride type, the model is activated carbon fo...

Embodiment 2

[0033] The fermentation acidity of citric acid fermented liquid is 14.6%, and citric acid fermented liquid is filtered through ceramic membrane (aperture 0.05 μm), and the dialyzed water addition is 17% of the volume of citric acid fermented liquid, and the content of citric acid in the dialysate liquid at the end of ceramic membrane is 0.5% , the yield of citric acid is 99.1%; the concentrated solution of the ceramic membrane directly enters the tube bundle dryer to dry and produce animal feed.

[0034] The powder carbon used in the decolorization process is zinc chloride type, the amount of powder carbon added is 0.5% (mass volume ratio) of the citric acid ceramic membrane dialysate, the decolorization temperature is 75 ° C, and it is incubated for 1 hour, so that the light transmittance of the decolorization solution is at 80%, the yield of citric acid is 99.2%.

[0035] Operating conditions of electrodialysis: Add citric acid decolorization solution to the fresh water tank i...

Embodiment 3

[0039] The fermentation acidity of citric acid fermented liquid is 15.2%, and citric acid fermented liquid is filtered through ceramic membrane (aperture 0.05 μm), and the amount of dialyzed water is 18% of the volume of citric acid fermented liquid, and the content of citric acid in the dialysate liquid at the end of ceramic membrane is 0.46% , the yield of citric acid is 99.6%; the concentrated solution of the ceramic membrane directly enters the tube bundle dryer to dry and produce animal feed.

[0040] The powder carbon used in the decolorization process is zinc chloride type, the powder carbon addition is 0.6% (mass volume ratio) of the citric acid ceramic membrane dialysate, the decolorization temperature is 75 ℃, and it is incubated for 1h, so that the light transmittance of the decolorization solution is at 82%, the yield of citric acid is 99.4%.

[0041] Electrodialysis operating conditions: add citric acid decolorization solution to the fresh water tank in electrodia...

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Abstract

The invention discloses a method for extracting refined citric acid from citric acid fermentation liquid. The citric acid products are obtained from the citric acid fermentation liquid through the steps of membrane disinfection, decoloration using powder carbon, electrodialytic treatment, decoloration using particulate carbon, ion exchange, concentration and crystallization. The method is used for preparing the citric acid products through the technology of membrane disinfection, decoloration, electrodialysis, ion exchange, concentration and crystallization, and the citric acid products have the advantages of high whiteness, low carbon, difficult caking, short technological process, stable production quality, energy conservation and emission reduction and slight environmental pollution, and the extraction ratio is about 90 percent.

Description

technical field [0001] The invention relates to the field of organic acid preparation, in particular to a method for extracting refined citric acid from citric acid fermentation broth. Background technique [0002] Citric acid is the most biochemically produced organic acid in the world, and it is widely distributed in plants, oranges, tangerines, grapes and other fruits. Usually sweet potatoes, corn, potatoes and other carbohydrates are used as raw materials, and citric acid products are produced through saccharification, fermentation and purification. Our country started the industrial production of citric acid in the 1960s. Due to the stimulation of export, it reached 300,000 tons per year in 1999. Up to now, there are as many as 100 domestic manufacturers. [0003] The raw materials for domestic production of citric acid are mostly dried sweet potatoes and other starchy substances, which are subjected to submerged fermentation. There are also molasses as raw material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/42
Inventor 李荣杰薛培俭尚海涛邓远德张雪锋
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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