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Method for preparing aviation oil precursor by catalytic depolymerization of alkali lignin in ethanol-water solvent through cooperation of Pd/C catalyst and alkali catalyst

A technology of alkali lignin and alkali catalyst, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of product complexity and difficult to achieve efficient depolymerization of alkali lignin Solve the problems of monocyclic aromatic compounds, intensified repolymerization, and low yield of monocyclic aromatic compounds, etc., to achieve the effect of strengthening bond breaking ability, promoting depolymerization degree, and improving bond breaking activity

Active Publication Date: 2021-10-22
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method prepares aviation fuel precursor by efficiently depolymerizing alkali lignin through the reaction system of carbon-based metal-homogeneous base synergistic catalyst and ethanol-water two-phase solvent, wherein the homogeneous base (NaOH) in the catalyst overcomes the carbon-based metal catalyst The competition between hydrodeoxygenation and hydrogenolysis leads to the problem of low yield of monocyclic aromatic compounds. At the same time, the hydrogenation active Pd metal center of Pd / C catalyst suppresses the disadvantage of intensified repolymerization when NaOH is used as a catalyst, and improves lignin production. The selectivity and yield of conversion to single-ring aromatics reduces the complexity of the product to solve the problem that the existing reaction system is difficult to achieve efficient depolymerization of alkali lignin to produce single-ring aromatics

Method used

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  • Method for preparing aviation oil precursor by catalytic depolymerization of alkali lignin in ethanol-water solvent through cooperation of Pd/C catalyst and alkali catalyst
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  • Method for preparing aviation oil precursor by catalytic depolymerization of alkali lignin in ethanol-water solvent through cooperation of Pd/C catalyst and alkali catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Depolymerization reaction of alkali lignin: a 100mL autoclave reactor was selected as the reaction device for depolymerization of alkali lignin to prepare monocyclic aromatic compounds. Before the reaction, 0.5 g of alkali lignin, Pd / C catalyst and 40 mL of ethanol-water two-phase solvent with a volume ratio of 3:2 were charged into the reactor. Seal the reactor to H 2 The reactor was purged three times and pressurized to 2MPa to wait for the reaction to start. After the reaction started, the material was mechanically stirred, the stirring speed was set to 400r / min, and the temperature rising program was set (from room temperature (about 30°C) to the target temperature (260°C), and the heating rate was 3°C / min), when After the reaction kettle rises to the target temperature, start timing according to the time required for the reaction until the end of the reaction time. After the reaction, turn off the mechanical stirring, take out the reactor and place it in the air ...

Embodiment 2

[0029] Depolymerization reaction of alkali lignin: the preparation process steps and parameters are the same as those in Example 1, except that the added catalyst is NaOH catalyst.

Embodiment 3

[0031]Depolymerization reaction of alkali lignin: the preparation process steps and parameters are the same as those in Example 1, except that the catalysts added are Pd / C catalyst and NaOH catalyst.

[0032] By comparing Examples 1-3, it can be found that: when using Pd / C or NaOH catalyst alone to depolymerize alkali lignin, the yield of the target product is not high, being 19.1% and 19.4% respectively, and the selectivity of a single product is relatively high. Low. When Pd / C and NaOH catalysts were used to synergistically decompose polyalkali lignin, the total yield of the target product was significantly increased to 37.5%. The specific data are shown in Table 1 below.

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Abstract

The invention discloses a method for preparing an aviation oil precursor by catalytic depolymerization of alkali lignin in an ethanol-water solvent through cooperation of a Pd / C catalyst and an alkali catalyst. The method comprises the following steps: taking alkali lignin as a raw material, adding an ethanol-water two-phase solvent into the raw material as a reaction solvent, respectively adding the Pd / C catalyst and a NaOH catalyst for depolymerization reaction, and after the reaction is finished, obtaining the aviation oil precursor. According to the method, alkali lignin is efficiently depolymerized through a reaction system of Pd / C, the NaOH catalyst and the ethanol-water two-phase solvent to prepare the aviation oil precursor, wherein the NaOH homogeneous alkali catalyst overcomes the problem that the yield of monocyclic aromatic compounds is low due to mutual competition of hydrodeoxygenation and hydrogenolysis bond breaking of a carbon-based metal catalyst; and the Pd / C catalyst has the hydrogenation activity Pd metal center, such that the heavy polymerization aggravation problem when the NaOH is adopted as the catalyst can be inhibited; the selectivity and the yield of the alkali lignin converted into the monocyclic aromatic compound can be improved by using the reaction system, the product complexity can be reduced, and the efficient depolymerization of the alkali lignin can be achieved to prepare the monocyclic aromatic compound.

Description

technical field [0001] The invention relates to the technical field of biomass energy utilization, in particular to a method for preparing aviation oil precursors by catalytically depolymerizing alkali lignin with a Pd / C catalyst in cooperation with an alkali catalyst in an ethanol-water solvent. Background technique [0002] Lignin is a biomass resource second only to cellulose in nature, and it is a renewable macromolecular polymer. C-C bonds or C-O-C bonds in its structure are broken to obtain aromatic products, and bulk aromatic compounds can be obtained through functional group modification and modification, or liquid fuels can be prepared through hydrodeoxygenation, so it has great potential. Alkali lignin is the main component of black liquor in the alkaline pulping process, which has the characteristics of large output, complex structure and difficult depolymerization. It is difficult to realize its resource utilization with the current technology, and if it is dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/07C07C39/08C07C37/00C07C43/23C07C41/01C07C33/20C07C29/00C07C15/02C07C13/10C07C13/18C07C1/20B01J23/44
CPCC07C37/005C07C41/01C07C29/00C07C1/20B01J23/44B01J23/04C07C2601/08C07C2601/14B01J35/19C07C39/07C07C39/08C07C43/23C07C33/20C07C15/02C07C13/10C07C13/18
Inventor 徐莹王文锦李茜刘琪英吕微严龙樊志强王晨光
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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