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Method for extracting citric acid by membrane separation

A citric acid, membrane separation technology, applied in fermentation, organic chemistry, ultrafiltration and other directions, can solve the problems of low resin exchange capacity or adsorption capacity, poor quality of filtration filtrate, poor product quality, etc., to improve clarity and reduce acidity. , the effect of reducing emissions

Inactive Publication Date: 2006-11-29
凯能高科技工程(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of this invention is to provide a method for extracting citric acid by membrane separation, to solve the problems of poor product quality, low extraction yield, poor filtrate quality, low resin exchange capacity or adsorption capacity, and low service life in the prior art. Short, filter residue as feed grade is low, heavy pollution, poor economic effect and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Accurately measure 80 liters of citric acid fermentation liquid and add it to the material tank, enter the operating system equipped with a filter membrane, and perform filtration operation at an operating pressure of 0.4 MPa and an operating temperature of 60 degrees Celsius; when concentrated to 1 / 3 of the volume of the fermented liquid, Add dialysis water for dialysis to elute residual citric acid in the concentrated solution; when dialysis water is added to 3 / 4 of the volume of fermentation broth, the total amount of permeate is 113.3 liters, and the total yield of citric acid is 99.9%; the permeate It can be directly applied to resin for further treatment, or treated with conventional calcium salt method to obtain finished citric acid.

Embodiment 2

[0022] Accurately measure 80 liters of citric acid fermentation liquid and add it to the material tank, enter the operating system equipped with a filter membrane, and perform filtration operation at an operating pressure of 0.2 MPa and an operating temperature of 80 degrees Celsius; when concentrated to 1 / 4 of the volume of the fermented liquid, Add dialysis water for dialysis to elute residual citric acid in the concentrated solution; when the dialysis water is added to approximately 1 / 2 of the volume of the fermentation broth, the total amount of permeate is 100 liters, and the total yield of citric acid is 99.9%; The superfluous liquid is directly put on the resin column for further treatment, or the conventional calcium salt method is used to obtain the finished product of citric acid.

Embodiment 3

[0024] Accurately measure 80 liters of citric acid fermentation liquid and add it to the material tank, enter the operating system equipped with a filter membrane, and perform filtration operation at an operating pressure of 0.7 MPa and an operating temperature of 30 degrees Celsius; when concentrated to 1 / 3 of the volume of the fermented liquid, Add dialysis water for dialysis to elute residual citric acid in the concentrated solution; when dialysis water is added to 3 / 4 of the volume of fermentation broth, the total amount of permeate is 113.3 liters, and the total yield of citric acid is 99.9%; the permeate The middle is directly put on the resin column for further treatment, or the conventional calcium salt method is used to obtain the finished product of citric acid.

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PUM

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Abstract

A process for extracting citric acid by membrane separation includes fermenting, filtering with microfilter (or ultrafilter) membrane at 10-90 deg.c and 0.2-1.5 MPa, concentrating the filtrate and resin adsorption (or exchange). Its advantages are high quality and extracting rate, and low pollution.

Description

technical field [0001] The invention relates to a method for extracting citric acid, in particular to a method for extracting and separating citric acid in fermentation broth by using a membrane separation system. Background technique [0002] Citric acid is widely used in artificial beverage and food industries. Industrially, citric acid can be produced by fermentation of glucose or sucrose. The citric acid in the fermentation broth can be obtained through a series of extraction processes. Existing extraction process of citric acid fermented liquid adopts traditional plate and frame filtration process or belt vacuum filtration process, which has the following defects: [0003] 1. There are many uncertain factors in the fermentation process. [0004] 2. The quality of the filtration effect depends on the form of the filter cake layer. Therefore, the precondition of not destroying the filter cake layer is the prerequisite for top washing. The top washing effect is not good a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/265C12P7/48B01D61/14
Inventor 林爱莲葛文越
Owner 凯能高科技工程(上海)有限公司