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Method for preparing bio-oil through hydrogenation degradation of lignin

A technology of hydrodegradation and lignin, which is applied in the preparation of ether, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of consuming more hydrogen sources and energy, the conversion rate is only about 50%, and the yield of bio-oil is low. and other problems, to achieve the effects of alleviating the economic crisis, easy large-scale production, and less bio-oil components

Inactive Publication Date: 2015-02-04
SOUTHEAST UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

Chinese patent (CN 101768052 A) describes that lignin is liquefied at 180-250°C, 3-8MPa, and 3-10h to prepare aromatic compounds using a nickel-based catalyst. This method needs to consume more hydrogen sources and energy, and the conversion rate is only around 50%
Chinese patent (CN 102372607A) discloses a bio-oil method for preparing monophenylcyclic phenols from alkali lignin. At 110-140°C, under a hydrogen pressure of 4-10MPa, noble metals such as Au, Ru, and Ni are used as catalysts. Bio-oil yields are low and not cheap
According to literature review, vanadium disulfide has not been used as a catalyst to hydrodegrade lignin to prepare high-performance bio-oil.

Method used

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  • Method for preparing bio-oil through hydrogenation degradation of lignin
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  • Method for preparing bio-oil through hydrogenation degradation of lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Ni-VS 2 Preparation of the catalyst: Weigh 1.80g of sodium orthovanadate, 1.65g of thioacetamide and 0.13g of nickel nitrate, dissolve them in 60mL of ethanol, stir them magnetically for 1 hour and put them into a polytetrafluoroethylene hydrothermal kettle. Reaction at 160°C for 24h. Cool to room temperature, wash with ethanol and distilled water several times, and dry in vacuum at 60°C for 6h. The resulting catalyst contains 5% nickel, expressed as 5% Ni-VS 2 .

[0019] Other conditions remain the same, only changing the quality of nickel nitrate added, can get nickel-containing vanadium disulfide catalysts of different components, respectively 0.1% Ni-VS 2 , 0.5%Ni-VS 2 , 1%Ni-VS 2 , 2%Ni-VS 2 , 10%Ni-VS 2 , 30%Ni-VS 2 .

Embodiment 2

[0021] Co-VS 2 、Mo-VS 2 , Ag-VS 2 Preparation of the catalyst: the preparation process is similar to that of Example 1, the difference being that the nickel nitrate was replaced with cobalt nitrate, sodium molybdate, and silver nitrate before the preparation. The mass content of Co, Mo, and Ag in the catalyst is 5%, respectively recorded as 5% Co-VS 2 , 5% Mo-VS 2 , 5% Ag-VS 2

Embodiment 3

[0023] Hydrocracking of lignin with different vanadium-based catalysts: 4g of lignin, 0.2g of catalyst and 40ml of ethanol were weighed into the autoclave, and the autoclave was tightly sealed. Introduce 2MPa nitrogen, vent, and repeat three times to get rid of the air in the reactor. Then, 3MPa hydrogen gas was introduced, the stirring speed was 800 rpm, the temperature was raised to 290° C. and the temperature was maintained for 1 h. Cool to room temperature after the reaction, and collect liquid bio-oil and solid residue. The catalyst used is respectively in table 1: (1) 0.5%Ni-VS 2 , (2) 1% Ni-VS 2 , (3) 2% Ni-VS 2 , (4) 5% Ni-VS 2 , (5) 10%Ni-VS 2 , (6) 30%Ni-VS 2 , (7) 5% Co-VS 2 , (8) 5% Mo-VS 2 , (9) 5% Ag-VS 2 . The liquid product was analyzed for its chemical composition by GC-MS.

[0024]

[0025]

[0026] Table 1 Performance comparison of different vanadium-based catalysts for hydrocracking lignin

[0027]

[0028]

[0029] It can be seen fr...

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Abstract

The invention relates to a method for preparing bio-oil through hydrogenation degradation of lignin. The method comprises the following steps: uniformly mixing lignin, a vanadium-based catalyst and a solvent, sealing the obtained mixture in an autoclave, and carrying out hydrogenation catalysis degradation to prepare the bio-oil. A mass ratio of the lignin to the vanadium-based catalyst is 100:1-10:1, a mass / volume ratio of the lignin to the solvent is 1:5-1:30, the reaction temperature is 150-400DEG C, the reaction time is 0.5-5h, the H2 pressure in the reaction is 0.5-6Mpa, and the main components of the prepared bio-oil are aromatic compounds and phenolic compounds. The method has the advantages of cheap catalyst, environmental protection, easy large-scale production, mild reaction conditions, high lignin conversion rate and high bio-oil yield; and the bio-oil contains few components and is an important chemical industry raw material.

Description

technical field [0001] The invention relates to a method for preparing bio-oil by hydrogenation degradation of lignin, especially a novel vanadium-based catalyst composed of vanadium disulfide and molybdenum, nickel, cobalt, silver and other doped components to degrade lignin and prepare high-performance bio-oil . Background technique [0002] In today's society, human beings' demand for energy is increasing, but traditional non-renewable fossil fuels such as oil and coal are facing increasing shortages, and the consumption of fossil fuels has made ecological deterioration and environmental problems more severe. Therefore, it is necessary to look for efficient, non-polluting The renewable biomass resources are imminent. As an important component of biomass, lignin is second only to cellulose, and it is also a major component of waste liquid discharged from paper cooking and pulping. The world can produce up to 600 trillion tons of lignin every year, which is the largest re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/52C07C41/01
CPCC07C37/54C07C41/01
Inventor 周建成田庆文刘佳慧李乃旭王猛邓金全
Owner SOUTHEAST UNIV
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