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Method of preparing lactic acid and lactate ester by catalyzing sugar to convert

A technology for catalyzing sugars and lactic acid esters, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylates, etc., can solve problems such as harsh requirements for instruments and equipment, long reaction time, and impact on applications, and achieve environmental friendliness, The effect of high concentration of sugar in the reactant and easy operation

Inactive Publication Date: 2013-04-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, supercritical or subcritical hydrothermal reactions need to be carried out at high temperature, which requires harsh equipment
However, the existing acid or base catalytic method is not efficient, requires higher temperature and longer reaction time, which affects its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 12 g methanol, 1.89 mmol glucose, 0.68 mmol SnCl 4 ·5H 2 O, 0.68 mmol NaOH and 0.68 mmol NaCl were added to the reactor, the temperature was raised to 160 oC, and the reaction was carried out for 150 min. The sugar conversion rate was determined by liquid chromatography analysis, and the lactate yield was analyzed and determined by gas chromatography with naphthalene as an internal standard. The sugar conversion rate was 91%, and the carbon yield of methyl lactate was 53%.

Embodiment 2

[0021] 12 g methanol, 1.89 mmol glucose, 0.68 mmol SnCl 4 ·5H 2 O, 0.68 mmol NaOH and 0.68 mmol NaCl were added to the reactor, the atmosphere in the reactor was replaced with nitrogen for 4 times, then filled with 0.1 MPa nitrogen, the temperature was raised to 160 oC, and the reaction was carried out for 150 min. The sugar conversion rate was determined by liquid chromatography analysis, and the lactate yield was analyzed and determined by gas chromatography with naphthalene as an internal standard. The sugar conversion rate was 90%, and the carbon yield of methyl lactate was 56%.

Embodiment 3

[0023] Except that the reaction temperature was 90°C, other conditions were the same as in Example 2, and the sugar conversion rate was 80%, and the carbon yield of methyl lactate was 23%.

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PUM

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Abstract

The invention provides a method of preparing lactic acid and lactate ester by catalyzing sugar to convert. The method is characterized in that water, micromolecular alcohol or an aqueous solution of the alcohol is taken as a solvent, a Sn containing compound is taken as a catalyst, and glucose, cane sugar, fructose, xylose, dioxyacetone and glyceraldehyde can be catalyzed to convert in a reaction vessel so as to obtain the lactic acid and lactate ester at high yield. The method has the advantages that the catalyst is low in cost and easy to obtain, reactants have high sugar concentration, reaction time is short, reaction temperature is low, the yield of lactic acid and lactate ester is high, needed equipment is simple, and the method is simple and convenient in operation and environmental-friendly.

Description

Technical field [0001] The present invention provides a method of catalyzing sugar conversion to prepare lactic acid and lactic acid ester. Specifically, the method of catalytic transformation is used to contain SN compounds as a catalyst, and inorganic alkali as a reactor pH. – Ion is a additive, and in the aqueous solution of water, small molecular or alcohol, sugar is transformed into lactic acid or lactate. Background technique [0002] Lactic acid (2-hydroxygate) and lactic acid ester are widely used in food, cosmetics, chemicals and pharmaceutical industries; in addition, lactic acid is also used to synthesize biodegradable plastic-polymapilic acid.Market demand will reach 3 million tons.Malaysia can be prepared by hydrocyanic acid and acetaldehyde through chemical synthesis.EssenceAs the total amount of non -renewable fossil resources such as oil and other non -renewable fossils is decreasing, people pay more and more attention to the use of renewable resources to prepare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/68C07C67/00C07C51/00C07C59/08
Inventor 杨晓梅周利鹏吴琳
Owner ZHENGZHOU UNIV
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