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Method for preparing lactic acid and lactide through dehydration extraction

A lactide and lactic acid technology, applied in the chemical industry, can solve the problems of high decomposition temperature of ammonium lactate, low lactic acid purity, difficulty in back extraction, etc., and achieves the effects of efficient purification, short process route, and avoiding low solubility

Inactive Publication Date: 2020-02-28
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent 00813710.2 mentions the method of using lactic acid acid solution to extract by organic amine, but its stripping is difficult, and the purity of the stripped lactic acid is not high. To obtain high-purity lactic acid, follow-up treatment is required
U.S. Patent US7186856B2 and WO 2006124633 A1 mentioned that the process of preparing lactic acid from the decomposition and extraction of ammonium lactate has disadvantages such as relatively high decomposition temperature of ammonium lactate, relatively long time, and relatively large energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment relates to a kind of preparation method of lactic acid, comprises the following steps:

[0040] 1) Take 100 g of crude product lactic acid solution with lactic acid concentration of 50%, and 455 g of organic solvent (wherein 182 g of trioctyl ammonium, 45 g of octachar alcohol, and 228 g of kerosene) are placed in a three-necked flask;

[0041] 2) Concentrate the above mixed solution in vacuum at 80° C. until no more condensed water comes out to obtain an organic solvent containing lactic acid. The organic solvent containing lactic acid was transferred to another three-necked flask. Add water and mix with the organic solvent containing lactic acid at 90° C. and then separate the organic solvent to obtain a solution containing lactic acid.

[0042] The yield of the lactic acid obtained by the above method is 92.5%, and the purity of the lactic acid is 99% after testing.

Embodiment 2

[0044] The present embodiment relates to a kind of preparation method of lactide, comprises the following steps:

[0045] 1) Take 200 g of crude product lactic acid solution with lactic acid concentration of 50%, and 395 g of organic solvent trioctyl ammonium in a three-necked flask;

[0046] 2) Carry out vacuum concentration at 80°C until no more condensed water comes out, then transfer the organic solvent containing lactic acid to a distillation flask;

[0047] 3) heating the distillation flask at 200°C to react to obtain lactide;

[0048] 4) Carry out vacuum distillation at 200° C. to obtain distillate lactide.

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PUM

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Abstract

The invention relates to a method for preparing lactic acid and lactide through dehydration extraction. The method comprises the following steps: 1) mixing a crude lactic acid solution with an organicsolvent to obtain a mixed solution to be treated; and 2) evaporating and concentrating the to-be-treated mixed solution, removing moisture to obtain an organic solvent dissolved with lactic acid, andcarrying out extracting to obtain lactic acid in the organic solvent. The lactic acid production method is short in process route and convenient to operate, and the obtained lactic acid is high in purity. When the method is used for producing lactide, a high-quality lactide product can be obtained without complex processes such as lactic acid refining and the like; product yield is high, environmental pollution is small, and complex operation in a traditional lactide production process is avoided.

Description

[0001] The present invention is a divisional application with an application date of June 9, 2017, an application number of 201710434619.7, and an invention title of "a method for preparing lactic acid and lactide by dehydration extraction". technical field [0002] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing lactic acid and lactide through dehydration extraction with an organic solvent. Background technique [0003] Lactic acid, also known as 2-hydroxypropionic acid, is mainly produced from starchy biomass through microbial fermentation or chemical synthesis. It is widely used in many important industrial fields such as food, medicine, chemical industry, new materials, and feed. Most of the existing lactic acid production technologies are produced by fermentation, and the lactic acid extraction technologies mainly include solvent extraction technology, molecular distillation technology, membrane separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/44C07C51/48C07C59/08C07D319/12
CPCC07C51/42C07C51/44C07C51/48C07D319/12C07C59/08
Inventor 李荣杰尚海涛潘声龙
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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