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A kind of method that biomass sugar prepares levulinic acid ester

A technology of levulinic acid ester and biomass sugar, applied in the field of chemical conversion of biomass, can solve the problems of high pollution, less by-products and high cost

Inactive Publication Date: 2017-03-15
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an economical, effective, universal and environmentally friendly method for preparing levulinate from biomass sugar, which can effectively overcome the shortcomings of existing methods such as strong corrosion, high pollution, and high cost; and the adopted The catalyst can be reused many times, with few by-products and high product yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 0.6 g of glucose, 0.3 g of magnetic solid acid catalyst (ZrP) and 12 g of methanol into the autoclave, seal it and replace the air in the autoclave with nitrogen, start stirring, and raise the temperature to 200°C for 3 hours. The yield of side reaction dimethyl ether is about 1%. The catalyst is separated by a magnetic technique, and the reaction liquid is quantitatively analyzed by a gas chromatograph and an internal standard method to obtain a molar yield of 43.8% of methyl levulinate.

Embodiment 2

[0019] Add 0.6 g of glucose, 0.6 g of magnetic solid acid catalyst (ZrP) and 12 g of methanol into the autoclave, seal it and replace the air in the autoclave with nitrogen, start stirring, and raise the temperature to 200°C for 3 hours. The catalyst is separated by a magnetic technique, and the reaction liquid is quantitatively analyzed by a gas chromatograph and an internal standard method, and the molar yield of methyl levulinate is 44.1%.

Embodiment 3

[0021] Add 0.6g of fructose, 0.3g of magnetic solid acid catalyst (ZrP) and 12g of methanol into the autoclave, seal it and replace the air in the autoclave with nitrogen, start stirring, and raise the temperature to 200°C for 3h. The catalyst is separated by a magnetic technique, and the reaction liquid is quantitatively analyzed by a gas chromatograph with an internal standard method to obtain a molar yield of 52.5% of methyl levulinate.

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Abstract

The invention discloses a method for preparing acetyl propionate from biomass sugar. The method comprises the following steps: reacting for 3-6 hours in an alcohol solution of 190-210 DEG C by taking the biomass sugar and magnetic zirconium phosphate solid acid as a catalyst to obtain acetyl propionate, wherein a molar ratio of P to Zr in the magnetic zirconium phosphate solid acid is 1-3, the alcohol is methanol, alcohol, propyl alcohol or butyl alcohol; a mass ratio of the magnetic zirconium phosphate solid acid to the biomass sugar is (0.4-2) to 1. According to the method disclosed by the invention, raw materials are renewable resources, and the acetyl propionate is directly prepared by adopting the magnetic solid acid which is easy to prepare, easy to separate and capable of recycled through catalysis one-step process. The method is simple in process, safe to operate, relatively low in equipment requirement and low in production cost, and is an environment-friendly production process.

Description

technical field [0001] The invention belongs to the technical field of chemical conversion of biomass, in particular to a method for preparing levulinic acid ester through direct alcoholysis of biomass sugar catalyzed by solid acid. Background technique [0002] As a new type of chemical product, levulinate is gradually attracting people's attention. Levulinate compounds (including: methyl levulinate, ethyl levulinate, butyl levulinate, etc.) have good chemical reactivity because of the carbonyl and ester groups in the molecule, and can undergo hydrolysis and transesterification , addition, substitution, redox and other reactions. It can be used as plasticizer, spice, flavoring agent, gasoline additive and biological liquid fuel, etc. It is widely used in food, medicine, pesticide, rubber, coating, transportation and other industries. At present, levulinic acid esters are mostly obtained from chemical raw materials through chemical organic synthesis, and their high cost an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/00C07C69/716
CPCY02P20/584
Inventor 刘平乐朱广星罗和安郝芳熊绍锋
Owner XIANGTAN UNIV
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