Method of industrial production of lactic acid by employing molecular distillation technology

A technology of molecular distillation and lactic acid, which is applied in the direction of molecular distillation, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of high impurity content, insufficient purity of food-grade lactic acid, and inability to be used as a raw material for polylactic acid production to achieve purity Improvement and arsenic reduction effect

Active Publication Date: 2014-04-16
河南金丹乳酸科技股份有限公司
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Problems solved by technology

For enterprises that produce polylactic acid, the food-grade lactic acid directly produced by the multi-effect falling film concentration device cannot be used as a raw material for polylactic acid product

Method used

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  • Method of industrial production of lactic acid by employing molecular distillation technology
  • Method of industrial production of lactic acid by employing molecular distillation technology
  • Method of industrial production of lactic acid by employing molecular distillation technology

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Embodiment Construction

[0026] The present embodiment utilizes the method for the industrialized production of lactic acid of molecular distillation technology, comprises the following steps:

[0027] (A) Use activated carbon to decolorize the feed liquid (the mass fraction of lactic acid is 10-20%) of the lactic acid fermentation broth after acid hydrolysis and filtration;

[0028] (B) Perform ion exchange on the decolorized feed liquid;

[0029] (C) Perform falling film evaporation on the feed liquid after ion exchange; concentrate it into a lactic acid solution with a mass fraction of 80% lactic acid,

[0030] (D) Evaporate the lactic acid material obtained after falling film evaporation, so that the mass fraction of water in the lactic acid material is equal to 2%; in this embodiment, a wiped-film thin-film evaporator is used for thin-film evaporation, and the scraper speed is 45 rpm , the internal temperature of the steam jacket is 120°C, the feed rate is 3200kg / h, and the absolute pressure is ...

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Abstract

The invention discloses a method of industrial production of lactic acid by employing a molecular distillation technology. The method comprises the following steps of: (A) decoloring material liquid obtained after acidolysis filtration of lactic acid fermentation liquid with active carbon, (B) performing ion exchange on the decolored material liquid, (C) performing falling film evaporation on the material liquid after the ion exchange, (D) performing thin film evaporation on a lactic acid material obtained after the falling film evaporation to allow the mass fraction of water in the material to be less than or equal 2%, and (E) performing molecular distillation on the lactic acid material obtained after the thin film evaporation to form fine lactic acid, namely the target product. Lactic acid produced by the method meets the high-purity requirements and can be directly used for preparing polylactic acid.

Description

technical field [0001] The invention relates to a preparation method of lactic acid, in particular to a method for industrialized production of lactic acid by using molecular distillation technology. Background technique [0002] Molecular distillation is different from traditional distillation, which relies on the separation principle of boiling point difference, but relies on the difference in the mean free path of molecular motion of different substances to achieve separation. When the liquid mixture is heated, light molecules and heavy molecules will escape from the liquid surface and enter the gas phase respectively. Since the free paths of light molecules and heavy molecules are different, the molecules of different substances will move different distances after escaping from the liquid surface; if If the condenser is set at an appropriate distance from the evaporator, the light molecules will reach the condenser and be condensed and discharged, while the heavy molecul...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C51/44
CPCB01D3/12C07C51/44C07C59/08
Inventor 张鹏于培星穆鹏宇廉洁崔耀军刘喆王新杨清翔顾永华葛大森张国宣张树银王浩师媛媛邢晓霞李艳坤崔红梅周冰辉刘恒军张杰杨锋刘晓东刘清华
Owner 河南金丹乳酸科技股份有限公司
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