A microemulsion reactor for catalytic depolymerization of lignin

A technology for catalyzing depolymerization and lignin, which is applied in the field of lignin catalyzing depolymerization to prepare high value-added products, can solve the problems of difficulty in ionic liquids, unfavorable recycling, product separation, etc., and achieves easy recovery, extremely easy product separation, The effect of high liquefaction rate and selectivity

Inactive Publication Date: 2017-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current catalytic conversion system, it is difficult to separate the ionic liquid from the product, which is not conducive to recycling.

Method used

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  • A microemulsion reactor for catalytic depolymerization of lignin
  • A microemulsion reactor for catalytic depolymerization of lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Ionic liquid BSmimHSO 4 Preparation of:

[0030] (1) Weigh an equimolar amount of N-alkylimidazole and butane sultone to react at 50°C for 24h; after the reaction, wash with ether and dry under vacuum at 60°C to obtain a white solid inner salt; the N- The carbon chain length of the alkylimidazole is 1 to 6 carbon atoms;

[0031] (2) Weigh an equimolar amount of acid and the internal salt prepared above; add concentrated sulfuric acid dropwise to the internal salt while stirring, and react at 50° C. for 48 hours;

[0032] (3) After the reaction, wash with anhydrous ether and dry in vacuum at 80°C for 48 hours to obtain the ionic liquid BSmimHSO 4 .

[0033] 2. Preparation of bagasse lignin:

[0034] (1) Pretreatment of agricultural waste: After the bagasse is fully dried, it is pulverized to below 60 mesh by mechanical pulverization, and its soluble components and ash are washed with deionized water and fully dried for later use;

[0035] (2) Extraction of organo...

Embodiment 2

[0039] Accurately weigh 0.5g bagasse lignin, 20mL n-butanol, 20mL deionized water, 2mL n-hexane, 3.0mmol 1-(4-sulfonic acid butyl)-3-ethylimidazolium bisulfate (BSeimHSO 4 ) into a 100mL autoclave, and reacted at 250°C for 0.5h. After the reaction, the reaction liquid was separated by filtration to obtain a solid residue, which was dried in vacuum at 60° C. for 24 hours, and the calculated liquefaction rate was 87.9%. The n-butanol water was separated, the n-butanol phase was extracted three times with deionized water, and the volume was adjusted to 100 mL with n-butanol, and the yield of the main phenolic monomer was determined to be 20.14 mg / g by GC-MS.

Embodiment 3

[0041]Accurately weigh 0.5g bagasse lignin, 20mL n-butanol, 20mL deionized water, 2mL n-hexane, 3.0mmol 1-(4-sulfonic acid butyl)-3-propylimidazolium bisulfate (BSpimHSO 4 ) into a 100mL autoclave, and reacted at 250°C for 0.5h. After the reaction, the reaction solution was separated by filtration to obtain a solid residue, which was dried in vacuum at 60° C. for 24 hours, and the liquefaction rate was calculated to be 88.6%. The n-butanol water was separated, the n-butanol phase was extracted three times with deionized water, and the volume was adjusted to 100 mL with n-butanol, and the yield of the main phenolic monomer was determined to be 26.38 mg / g by GC-MS.

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Abstract

The invention discloses a micro emulsion reactor used for lignin catalytic depolymerization. The micro emulsion reactor is used through following steps: 1) mixing and stirring organically-soluble lignin, sulfonic acid-functionalized acidic ionic liquid, a hydrocarbon compound, a hydrophobic organic solvent and deionized water; 2) performing a hydrothermal reaction at 150-300 DEG C; and 3) after the reaction is carried out for 5-120 min, filtering a reaction liquid, performing liquid separation to obtain an oil phase containing phenols, a water phase containing the ionic liquid and solid residues. The micro emulsion reactor is high in liquefaction rate of lignin and selectivity. After the reaction, because the lignin is reduced in hydrophilicity, the reaction spontaneously forms two phases, so that the solid residues are obtained through filtration and the water phase being rich in the ionic liquid is obtained through the liquid separation. Extra water is removed in a rotary evaporation manner to recycle the ionic liquid for the next reaction directly. The reactor has a significant process strengthening effect on the depolymerization of lignin.

Description

technical field [0001] The invention belongs to the technical field of preparing high value-added products by catalytic depolymerization of lignin, and in particular relates to a microemulsion reactor for catalytic depolymerization of lignin. Background technique [0002] Biomass is the only energy source that can provide carbon-containing compounds among renewable energy sources, and has significant advantages such as "carbon neutrality", wide sources, and huge annual output, and plays an important role in the entire energy system. The major components of biomass include cellulose, hemicellulose, and lignin. In recent years, the efficient conversion of cellulose and hemicellulose by chemical or biological methods to prepare biofuels and platform compounds has been well developed. However, as the second largest component of biomass, lignin is also the only renewable resource that can provide aromatic compounds in nature. Due to the complexity and uncertainty of its structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/18C07G99/00
CPCY02P20/54
Inventor 李雪辉蔡镇平龙金星王芙蓉于英豪王乐夫
Owner SOUTH CHINA UNIV OF TECH
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