L-lactic acid impurity separating and removing process

A technology of impurity and lactic acid, which is applied in the field of microelectric sieving membrane filtration and separation, can solve the problems of poor optical purity and product quality difference, and achieve the effect of excellent color quality, good effect and high purity of the product

Inactive Publication Date: 2012-12-12
顾曰田
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AI Technical Summary

Problems solved by technology

When lactic acid is concentrated, the small amount of sugar contained will be coked and the color of the final product will exceed the standard, and some organic impurities will remain in the finished product, making the optical purity of the product less than perfect, resulting in a poor product quality

Method used

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Embodiment Construction

[0006] First determine the optimum temperature for the formation of large particles of calcium sulfate in acid hydrolysis, use a temperature sensor to detect the end acid hydrolysis temperature, and feed back to the sulfuric acid flow controller; use a precision pH meter to detect the pH value in the solution online, and feed back to the sulfuric acid flow control device. Control the flow of sulfuric acid according to the set requirements, so as to achieve the purpose of controlling the temperature and pH of the solution in the area. The above-mentioned L-lactic acid containing a large number of sugar-containing impurities initially formed is filtered through a microelectric sieving membrane to remove sugar and impurities. In the above process, the microelectric sieving membrane has an affinity for negatively charged lactic acid, adsorbs before the microelectric sieving membrane, and analyzes after the membrane, so as to accelerate the passage of L-lactic acid. At the same ti...

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Abstract

The invention relates to an L-lactic acid impurity separating and removing process which is suitable for the lactic acid back-way extraction process and belongs to the technical field of micro electric screening film filtering separation. The process is characterized by preliminarily forming lactic acid containing a large amount of impurities, enabling the lactic acid to be filtered by the micro electric screening film, utilizing the micro electric screening film, conducting adsorption on the electronegative lactic acid before the film and conducting analysis after the film to enable the lactic acid to pass quickly. The process has the advantages of being good in impurity removing effect, good in product color quality, high in purity and the like.

Description

technical field [0001] The invention relates to a technology for separating and removing impurities of L-lactic acid, which is suitable for the subsequent extraction process of lactic acid, and belongs to the technical field of microelectric screening membrane filtration and separation. Background technique [0002] At present, the common problem in the production process of L-lactic acid is that the residual content of impurities mainly sugars in the product is relatively high, which makes it difficult for the product to meet the standards in terms of color and other aspects. This is because the residual polysaccharides and monosaccharides will enter the purification process such as filtration and adsorption along with the fermentation broth after the fermentation is completed. Although part of the sugar will be removed due to the adsorption of activated carbon and the separation resin, there is still a certain amount of sugar remaining in the final product liquid. When la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/42
Inventor 顾曰田
Owner 顾曰田
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