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Citric acid extraction method and membrane bioreactor for producing citric acid

The technology of membrane bioreactor and extraction method is applied in the field of membrane bioreactor and citric acid extraction process, which can solve the problems of serious environmental pollution, poor citric acid selectivity and high production cost, and achieves improved fermentation depth and high citric acid production. The effect of improving the fermentation rate and fermentation depth

Inactive Publication Date: 2014-05-14
HUNAN CHEM VOCATIONAL TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process has problems such as complex process flow, serious environmental pollution, unstable product quality, and high production costs.
There are some problems in the traditional production process. First, the fermentation process is the core link of the citric acid production process. The fermentation is carried out in a fermenter. The traditional fermentation process has the following disadvantages: the citric acid selectivity of the strains used in the traditional fermentation is poor, and the fermentation broth The content of impurities such as sugar and protein in the medium is high, resulting in complex citric acid separation technology, low citric acid output, low raw material utilization rate, low product yield, and poor comprehensive economic benefits
The complex technological process, serious environmental pollution and high cost of citric acid production process have not been solved

Method used

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  • Citric acid extraction method and membrane bioreactor for producing citric acid
  • Citric acid extraction method and membrane bioreactor for producing citric acid
  • Citric acid extraction method and membrane bioreactor for producing citric acid

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Effect test

Embodiment 1

[0045] A method for producing citric acid, a membrane bioreactor for producing citric acid and a citric acid extraction process. The membrane bioreactor is lined with a polysulfone ultrafiltration membrane with good oxidation resistance and acid resistance. The effective volume is 100L. The device integrates fermentation and membrane separation. The fermentation process and the membrane separation process are carried out alternately. Three fermentations were separated from the membrane to prepare and extract citric acid. Put the selected strains into the sterilized potato dregs clinker (dried potato dregs 40kg) and a suitable proportion of nitrogen source rice bran and calcium carbonate auxiliary materials, and the first fermentation reaches a fermentation depth of 60-70%. The second round of fermentation can reach a fermentation depth of about 80-85%, and the third round of fermentation can reach a fermentation depth of about 90-95%.

[0046] The polysulfone ultrafiltration ...

Embodiment 2

[0058] A method for producing citric acid, a membrane bioreactor for producing citric acid and a citric acid extraction process. The membrane bioreactor is lined with a polysulfone ultrafiltration membrane with good oxidation resistance and acid resistance. The effective volume is 100L. The device integrates fermentation and membrane separation. The fermentation process and the membrane separation process are carried out alternately. Three times of fermentation and membrane separation, preparation and separation of citric acid; put the selected strains into the sterilized potato dregs clinker (dried potato dregs 40kg) and 0.7% nitrogen source ammonium sulfate and 2% calcium carbonate Among the auxiliary materials, the first fermentation can reach a fermentation depth of 70%, the second round of fermentation can reach a fermentation depth of 85%, and the third round of fermentation can reach a fermentation depth of 95%. The implementation steps are the same as in Embodiment 1. ...

Embodiment 3

[0060] A method for producing citric acid, a membrane bioreactor for producing citric acid and a citric acid extraction process, the membrane bioreactor is a polysulfone ultrafiltration membrane with a liner with good oxidation resistance and acid resistance, and the effective volume is 100L, the device integrates fermentation and membrane separation, the fermentation process and the membrane separation process are carried out alternately, after three times of fermentation and membrane separation, citric acid is prepared and separated; the selected strains are put into the sterilized potato dregs In clinker (dried potato residue 40kg) and 0.4% nitrogen source urea and 2% calcium carbonate auxiliary materials, the first fermentation reaches a fermentation depth of 67%, the second round of fermentation can reach a fermentation depth of about 82%, and the third round of fermentation can reach a fermentation depth of about 82%. Round fermentation can reach about 95% fermentation de...

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Abstract

The invention provides a citric acid extraction method and a membrane bioreactor for producing citric acid. The citric acid extraction method is characterized in that the membrane bioreactor with a movable liner is utilized, fermentation and membrane separation are integrated in the membrane bioreactor, the fermentation process and the membrane separation process are alternatively carried out in the membrane bioreactor, and citric acid is prepared and separated through three-times fermentation and membrane separation; a breeding bacterial strain is put in the membrane bioreactor filled with sterilized potato slag clinker, a proper proportion of nitrogen source rice bran (urea or ammonium sulfate) and calcium carbonate auxiliary materials, the first fermentation can reach 60-70% of fermentation depth, the second fermentation can reach about 80-85% of fermentation depth, and the third fermentation can reach about 90-95% of fermentation depth.

Description

technical field [0001] The invention relates to a chemical device and its use method, in particular to a membrane bioreactor for producing citric acid and a citric acid extraction process. Background technique [0002] Citric acid, also known as citric acid, is colorless, odorless, translucent crystal or white powder, easily soluble in water and alcohol. It is mainly used in the food industry, pharmaceutical industry, chemical industry, and also has a very wide range of applications in the fields of electronics, textiles, petroleum, leather, construction, photography, plastics, casting and ceramics. By 2010, the output of citric acid in my country has reached 1 million tons, accounting for about 53% of the world's total output, and the export is 850,000 tons, more than half of the world's total trade volume. Both output and trade volume rank first in the world. [0003] The traditional citric acid production process usually uses starch-rich crops such as corn and potatoes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/48C12M1/38C12R1/685
Inventor 颜鑫邓新云罗跃中刘小忠卢云峰傅国新
Owner HUNAN CHEM VOCATIONAL TECH COLLEGE
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