Lactic acid is a simple hydroxy acid, which widely exists in human, animals, plants and microorganisms. Lactic acid has an asymmetric carbon atom, so it has optical activity; Among them, l-lactic acid is dextral, d-lactic acid is left-handed, and dl lactic acid is racemic. As one of the three largest organic acids in the world, lactic acid is widely used in brewing, medicine, food, cigarette, leather and other industrial fields.
The lactic acid industry is a hot research topic at present. The fermentation process of lactic acid has been mature, but the main problem lies in how to obtain high-purity lactic acid efficiently, economically and environmentally.
At present, lactic acid extraction processes include calcium salt method, extraction method, distillation method and esterification hydrolysis method. In the distillation method, the molecular distillation method is widely used in production. For example, in the existing technology, lactic acid is obtained by acidolysis, decolorization, ion exchange, vacuum concentration, film evaporation and molecular distillation of lactic acid fermentation broth, and the industrial production method of lactic acid is obtained by acidolysis, decolorization, ion exchange, falling film evaporation, film evaporation and molecular distillation of lactic acid fermentation broth. However, most of the above methods have the defect of low lactic acid yield, and will discharge a large amount of substrate from lactic acid distillation kettle.
In order to solve the problems of large lactic acid loss, low yield, low purity, serious pollution and non continuous production during the separation and extraction of lactic acid, Zhengzhou Tiei Extraction uses a new ionic solvent to extract lactic acid in the crude lactic acid solution by coupling adsorption, so that lactic acid can be effectively separated from water and other impurities, and then the thermal sensitivity of the solvent can be used to separate lactic acid from the solvent. The lactic acid is purified by Tiei extraction solvent extraction method, and the final product is of high collection, good product quality, good thermal stability, and all indicators are qualified and superior to the national standard requirements.
Tiei extraction green new CWL-M series centrifugal lactic acid extraction process equipment has four characteristics:
(1) High efficiency: the residual concentration of lactic acid in the stock solution after coupling adsorption separation is low;
(2) Strong selectivity: only adsorb lactic acid and substances with the same polarity, not other substances;
(3) Low production cost: as the coupling adsorption separation is carried out under normal pressure, no other raw materials need to be consumed;
(4) High separation quality: the product quality index reaches or partially exceeds the international level of similar products;