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Method for preparing cyclic alcohol through catalytic conversion of lignin depolymerized bio-oil

A technology for catalytic conversion and bio-oil, applied in the field of lignin conversion, can solve the problems of low selectivity of target products, difficult product separation, uncontrollable conversion process, etc., and achieves good application prospects, strong selectivity, and high product yield. Effect

Pending Publication Date: 2022-07-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there is a problem with the new catalytic method that uses cheap metals as catalytic active components and organic hydrogen-donating solvents as hydrogen sources: the products obtained by catalysis are easily over-deoxygenated into naphthenes, resulting in uncontrollable conversion process and target product selection. Low stability, difficult product separation, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.1 g of lignin pyrolysis bio-oil, 0.01 g of CuZnAlO with Cu content of 20% x The catalyst and 1.2 g methanol were placed in the reactor, purged with argon, pressurized and sealed; then, the reactor was heated to 300 °C for 2 hours, and the reaction was completed, and the reactor was placed in ice water for rapid cooling to stop The reaction was followed by filtration, the liquid phase product was collected, and its composition was determined by GC-MS and GC-FID. The results were: the monomer yield was 20.31C%, the cycloalcohol selectivity was 80.05%, and the cycloalkane selectivity was 0.78%.

Embodiment 2

[0041] 0.1g lignin hydrogenolysis bio-oil, 0.03g Cu content of 10% CuZnAlO x The catalyst and 2.4g of ethanol were placed in the reactor, purged with argon, pressurized and sealed; after that, the reactor was heated to 200°C for 2 hours, and after the reaction was completed, the reactor was placed in ice water for rapid cooling to stop The reaction was followed by filtration, the liquid phase product was collected, and its composition was determined by GC-MS and GC-FID. The results were as follows: the monomer yield was 23.76C%, the cycloalcohol selectivity was 77.91%, and the cycloalkane selectivity was 0.48%.

Embodiment 3

[0043] Oxidative degradation of 0.1g lignin bio-oil, 0.05g Cu content of 30% CuZnAlO x The catalyst and 2.4 g of propanol were placed in the reactor, purged with argon, pressurized and sealed; after that, the reactor was heated to 300 °C for 4 h and kept for reaction. After the reaction was completed, the reactor was placed in ice water for rapid cooling. The reaction was stopped and the liquid phase product was filtered, collected and its composition determined by GC-MS and GC-FID. The results were: the monomer yield was 38.45C%, the cycloalcohol selectivity was 82.21%, and the cycloalkane selectivity was 1.01%.

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Abstract

The invention relates to a method for preparing cyclic alcohol through catalytic conversion of lignin depolymerized bio-oil. The method comprises the following steps: putting the lignin depolymerized bio-oil, a hydrogen-donor solvent and a cheap metal catalyst into a reactor; washing with inert gas, pressurizing, sealing the reactor, heating to a specified temperature, and carrying out heat preservation reaction; and after the reaction is completed, rapidly cooling the reactor to stop the reaction, filtering a liquid-phase product, and removing the hydrogen-donor solvent to obtain the cyclic alcohol. The adopted catalyst has the functions of catalyzing alcohol reforming hydrogen supply and selective hydrogenation of the lignin depolymerized bio-oil, the acidity is moderate, cyclic alcohol is prevented from being generated by excessive deoxidation of the cyclic alcohol while the aromatic ring structure of the lignin depolymerized bio-oil is efficiently hydrogenated and saturated and methoxyl is removed to prepare the cyclic alcohol, and the yield of the cyclic alcohol is increased. The method realizes high-selectivity catalytic conversion of lignin depolymerized bio-oil to prepare cyclic alcohol, and has the advantages of high product yield, strong selectivity, good quality and the like.

Description

technical field [0001] The invention relates to the technical field of lignin conversion, in particular to a method for preparing cycloalcohol by catalytic conversion of lignin depolymerized bio-oil. Background technique [0002] New energy technology plays an important role in actively promoting the transformation of the energy structure, developing and replacing traditional fossil energy, and helping to achieve "carbon peak" and "carbon neutrality". Compared with new energy sources such as solar energy, wind energy, and tidal energy, biomass is the only renewable organic carbon source in nature. Using biomass to produce "alternative fuels" for traditional fossil fuels is an effective way to achieve "negative carbon". Cyclic alcohols are important components of oxygen-containing fuels and diesel fuel additives, and their high oxygen content can effectively improve the atomic utilization rate of fuels, improve energy efficiency and reduce pollutant emissions. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/20C07C31/135C07C1/20C07C13/18C07G1/00
CPCC07C29/20C07C1/20C07G1/00C07C31/1355C07C13/18
Inventor 刘超孔祥琛肖睿李培君范宇阳徐维聪李明
Owner SOUTHEAST UNIV
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