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Method for catalytic preparation of acetylpropionic acid in one step by using waste residues obtained by producing xylose

A technology for the preparation of levulinic acid and catalysis, which is applied in chemical instruments and methods, the preparation of organic compounds, the preparation of carboxylate, etc., can solve the problems of high cost, environmental pollution, and high requirements for reaction equipment, and achieve no equipment corrosion, process Fewer steps, the effect of increasing the value of use

Active Publication Date: 2015-05-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing levulinic acid by one-step catalysis of xylose waste residue, open up a new way to prepare levulinic acid, and overcome the high requirements for reaction equipment in the prior art using liquid strong acid as a catalyst. Disadvantages such as high cost and serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 4g of xylose residue raw material and 1g of aluminum chloride catalyst into a 250mL closed autoclave reactor, and then add 100mL of high-purity water. After sealing the autoclave, nitrogen gas was introduced for 5 minutes, the air in the autoclave was discharged, and the pressure was increased to 2 MPa. Stirring speed is 400rpm, heat up to 200°C and react for 0.5 hours, then cool rapidly and wash the product out of the kettle with distilled water, filter the product through a microporous membrane, and quantitatively analyze it with high performance liquid chromatography. The resulting levulinic acid yield was 19.4% (calculated based on the total amount of cellulose in the reaction raw material).

Embodiment 2—3

[0016] By the step operation of embodiment 1, difference is that nitrogen pressure is different, and other reaction conditions are identical with embodiment 1, and concrete result is listed in table 1.

[0017] Table 1

[0018] Example

Embodiment 4—5

[0020] By the step operation of embodiment 1, difference is that the consumption of water is different, and other reaction conditions are identical with embodiment 1, and concrete result is listed in table 2.

[0021] Table 2

[0022] Example

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PUM

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Abstract

The invention relates to a method for catalytic preparation of acetylpropionic acid in one step by using waste residues obtained by producing xylose. The method comprises the following step of: carrying out selective catalytic conversion on cellulose in corn cob residues in an autoclave reactor at a nitrogen atmosphere by using the corn cob residues as raw materials, water as a reaction solvent, commercially available aluminum trichloride as a catalyst and sodium chloride as an additive to prepare acetylpropionic acid in one step. The aluminum trichloride catalyst has high catalytic activity; the reaction yield of acetylpropionic acid can reach 32.7% under optimal conditions; the reaction raw material is rich and is easy to obtain; and compared with the conventional liquid superacid catalyst, aluminum trichloride is less in equipment corrosion and low in environmental harm degree.

Description

technical field [0001] The invention relates to a method for preparing levulinic acid from xylose residue. Background technique [0002] In the process of producing xylose from corncobs, a large amount of waste residue—xylose residue will be produced. The factory produces about 12 tons of xylose residue for every 1 ton of xylose produced, and the discarded xylose residue contains a large amount of lignocellulose. Rational use of these waste residues and turning waste into treasure can not only solve the environmental problems caused by xylose residues, but also improve the economic benefits of the factory. Levulinic acid, containing carbonyl, α-hydrogen and carboxyl, can undergo various chemical reactions including esterification, hydrogenation, and halogenation, and has a wide range of application values ​​in the fields of industry, agriculture, and medicine. At present, there are mainly two kinds of technological routes for preparing levulinic acid at home and abroad. O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/185C07C51/00
Inventor 胡常伟蒋智成李建梅胡立斌罗倚坪祝良芳
Owner SICHUAN UNIV