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Preparation method of lactic ester

A lactate and carbohydrate technology, applied in the chemical industry, can solve the problems of short reaction time and high concentration of reactant sugar, and achieve the effects of low cost, high catalytic activity and improved product conversion rate.

Active Publication Date: 2015-11-18
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantages of cheap catalyst, easy access, high concentration of reactant sugar, short reaction time, low reaction temperature, simple required equipment, easy operation and environmental friendliness, the conversion rate of lactic acid or lactate still needs to be improved. improve

Method used

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  • Preparation method of lactic ester
  • Preparation method of lactic ester

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preparation example Construction

[0016] The invention provides a method for preparing lactic acid esters. Carbohydrates, transition metal salts, alcohols and water are mixed, and the mixed solution is stirred and reacted at a temperature of 200-260°C and a pressure of 4-15 MPa to obtain The lactic acid ester and the transition metal salt are acidic, the alcohol is a low-carbon alcohol with 1-4 carbon atoms, and the carbohydrate is a hydrolyzed carbohydrate including monosaccharide.

[0017] The reaction mechanism of the present invention is: the depolymerization reaction occurs on macromolecules such as cellulose, and macromolecules form small molecular substances through depolymerization. When the raw material is cellulose, the fiber macromolecule first undergoes a hydrolysis reaction to obtain monosaccharides, and then undergoes a series of reactions such as ring opening, isomerization, and esterification to finally obtain lactate. The main factors affecting the preparation of lactate are temperature, press...

Embodiment 1

[0041] A method for preparing lactic acid esters in this example comprises mixing carbohydrates, transition metal salts, alcohols, and water, and stirring and reacting the mixed liquid at a temperature of 200°C and a pressure of 4 MPa to obtain the milk ester, the solid-to-liquid ratio of the mass of the carbohydrate to the total volume of the alcohol and water is 1:1, the volume ratio of the alcohol to water is 20:1, the transition metal salt is acidic, and the alcohol It is a low-carbon alcohol with 1-4 carbon atoms, and the carbohydrate is a hydrolyzed carbohydrate including monosaccharide. The alcohol is selected from one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol. The carbohydrates are selected from one or more of plant cellulose, artificial fiber pulp, starch, sucrose, fructose and glucose. The metal in the transition metal salt is selected from one or more of titanium, platinum, nickel, zirconium, chromium, tungsten, zinc, iron and ...

Embodiment 2

[0043] A method for preparing lactic acid esters in this example comprises mixing carbohydrates, transition metal salts, alcohols, and water, and stirring the mixed solution at a temperature of 260°C and a pressure of 15 MPa to obtain the milk ester, the solid-to-liquid ratio of the mass of the carbohydrate to the total volume of the alcohol and water is 1:60, the volume ratio of the alcohol to water is 1:20, the transition metal salt is acidic, and the alcohol It is a low-carbon alcohol with 1-4 carbon atoms, and the carbohydrate is a hydrolyzed carbohydrate including monosaccharide. The alcohol is selected from one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol and isobutanol. The carbohydrates are selected from one or more of plant cellulose, artificial fiber pulp, starch, sucrose, fructose and glucose. The metal in the transition metal salt is selected from one or more of titanium, platinum, nickel, zirconium, chromium, tungsten, zinc, iron and copper, a...

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Abstract

The invention relates to a preparation method of lactic ester. The method includes: mixing a carbohydrate, a transition metal salt, alcohol and water, subjecting the mixed solution to stirring reaction under a temperature of 200-260DEG C and a pressure of 4-15MPa so as to obtain the lactic ester. The transition metal salt is acidic, the alcohol is low carbon alcohol with a carbon atom number of 1-4, and the carbohydrate has a hydrolysis product containing monosaccharide. The preparation method of the lactic ester provided by the invention has the advantages of simple overall reaction process, safety and high efficiency, low cost, low equipment requirement, popularization and application, and significant increase of the product conversion rate.

Description

technical field [0001] The invention relates to chemical technology, in particular to a preparation method of lactate. Background technique [0002] Carbohydrates are the most abundant natural renewable resource on earth. In particular, sugars such as cellulose, hemicellulose, starch, sucrose, fructose, and glucose are more likely to degrade into various basic compounds because they contain oxygen-containing functional groups such as polyhydroxyl groups. [0003] Lactate is an environmentally friendly and green organic solvent with good solubility, non-toxicity, easy recycling and degradability. It is widely used in food, cosmetics, medicine and chemical synthesis industries, mainly including methyl lactate, ethyl lactate, N-propyl lactate, isopropyl lactate, n-butyl lactate and tert-butyl lactate, etc. Methyl Lactate is a colorless flammable liquid, mainly used in the nitrocellulose lacquer and coating industry to improve the blush resistance and ductility of the coating....

Claims

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Application Information

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IPC IPC(8): C07C67/00C07C69/68
CPCC07C45/52C07C45/59C07C45/64C07C67/00C07H1/00C07H3/02C07C47/19C07C49/17C07C49/185C07C49/175C07C69/68
Inventor 黄彪曾常伟吕建华卢贝丽卢麒麟蔡政汉林咏梅谭非陈燕丹陈学榕
Owner FUJIAN AGRI & FORESTRY UNIV
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