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Method for catalytically synthesizing gamma-valerolactone by using cobalt-based hydrogenation catalyst

A hydrogenation catalyst, valerolactone technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of poor stability, long reaction time, metal activity The problem of easy leaching of components can achieve the effects of easy recovery, short reaction time and good reusability

Pending Publication Date: 2020-10-30
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problems such as easy leaching of metal active components of the catalyst, long reaction time, and poor stability, the present invention prepares a cobalt-based hydrogenation catalyst Co / ZrO 2 -Nb 2 o 5 , using isopropanol as the hydrogen source, catalyzed the hydrogenation of methyl levulinate to synthesize γ-valerolactone, and reacted at 200°C for 2 hours to obtain γ-valerolactone with a molar yield of 98.32% and a purity of 99.01%, which was recovered by vacuum drying The catalyst was reused 10 times, and the molar yield of γ-valerolactone remained at 95.83 and the purity was 96.59%.

Method used

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  • Method for catalytically synthesizing gamma-valerolactone by using cobalt-based hydrogenation catalyst
  • Method for catalytically synthesizing gamma-valerolactone by using cobalt-based hydrogenation catalyst
  • Method for catalytically synthesizing gamma-valerolactone by using cobalt-based hydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Cobalt-based hydrogenation catalyst Co / ZrO 2 -Nb 2 o 5 preparation of

[0038] The first step: Nb(HC 2 o 4 ) 5 with ZrOCl 2 ·8H 2O adds deionized water and stirs and dissolves in a molar ratio of 0.25:1 to form a mixed solution with a total molar concentration of 0.15mol / L, then slowly adds ammonia water to control the pH value of the mixed solution at 13, and stirs at room temperature for 30min to obtain a Mixed solution containing white precipitate;

[0039] The second step: transfer the above mixed solution containing white precipitate into a polytetrafluoroethylene liner for crystallization at 180°C for 6 hours, cool to room temperature, filter the precipitate with suction, wash the filter cake with deionized water until neutral, and dissolve the obtained The white powdery filter cake was dried at 80°C for 6h, then placed in a box-type muffle furnace at a rate of 2°C / min to 450°C and roasted for 6h, and then ZrO was obtained after cooling. 2 -Nb 2 o 5 ...

Embodiment 2

[0046] Example 2 The operating steps are the same as in Example 1, but the reaction temperature is 160°C, the molar yield of gamma-valerolactone is 13.17%, and the product purity is 20.44%.

Embodiment 3

[0047] Example 3 The operating steps are the same as in Example 1, but the reaction temperature is 180° C., the molar yield of gamma-valerolactone is 86.49%, and the product purity is 92.04%.

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Abstract

The invention discloses a method for synthesizing gamma-valerolactone through hydrogenation of methyl levulinate under the catalysis of a cobalt-based hydrogenation catalyst Co / ZrO2-Nb2O5. The catalyst has the advantages of high catalytic activity, good reusability, difficulty in loss of active components, easiness in separation from a liquid product and the like; when a mass ratio of the catalystto the reaction raw material methyl levulinate to the reaction solvent isopropanol is 0.2: 1: 20, a reaction temperature is 200 DEG C, and reaction time is 2 hours, the molar yield of the obtained hydrogenation product gamma-valerolactone is 98.32%, and the mass percent of the purity of the product is 99.01%.

Description

technical field [0001] The invention belongs to the field of biomass catalysis and relates to a cobalt-based hydrogenation catalyst Co / ZrO 2 -Nb 2 o 5 A method for catalyzing methyl levulinate to synthesize gamma-valerolactone. Background technique [0002] As a renewable and sustainable organic molecule, biomass has a wide range of sources and is cheap, and can be used to produce biofuels and high value-added chemicals. Levulinic acid and its esters are a biomass-based platform compound, which can be obtained by acidic hydrolysis of lignocellulose in crop straw, and then catalytic hydrogenation to obtain another biomass-based chemical, γ-valerolactone. γ-valerolactone has the characteristics of high boiling point, low volatility, good solubility, high stability, low toxicity, degradability, and easy storage. It can be used as a resin solvent and an intermediate in biofuels, polymers, and fine chemicals. Used as a lubricant, plasticizer, gelling agent for non-ionic surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/33B01J23/847B01J35/08B01J35/10
CPCC07D307/33B01J23/8474B01J23/002B01J35/51B01J35/613B01J35/633B01J35/647Y02P20/10
Inventor 刘跃进何爽付琳李勇飞巴文霞邓文聪
Owner XIANGTAN UNIV
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