Method for preparing aromatic compounds by conducting hydrogenation and depolymerization on spruce lignin through electro-catalysis technology

A technology of aromatic compounds and corn stalks, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of high production cost, high equipment requirements, harsh process, etc., achieve stable properties, high application value, and avoid complex processes conditional effect

Inactive Publication Date: 2017-05-17
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chang et al. in TiO 2 The surface photocatalytic oxidation method degrades lignosulfonate, although the degradation rate reaches 90%, but the photocatalytic degradation method is easy to cause deep oxidation degradation, and the alkali lignin is finally decomposed into CO 2 and H 2 o
Omar Movil-Cabrera et al. used Co/Pt electrodes to electrocatalytically oxidize and degrade lignin in sodium hydroxide solution, and obtained heptane, heptene, phenol and oth

Method used

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  • Method for preparing aromatic compounds by conducting hydrogenation and depolymerization on spruce lignin through electro-catalysis technology
  • Method for preparing aromatic compounds by conducting hydrogenation and depolymerization on spruce lignin through electro-catalysis technology
  • Method for preparing aromatic compounds by conducting hydrogenation and depolymerization on spruce lignin through electro-catalysis technology

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Experimental program
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Embodiment 1

[0023] In a beaker equipped with a stirrer, add 8 g of corn stalk lignin and dissolve it in 200 mL of sodium hydroxide solution (1 mol / L) to form a homogeneous alkali solution of lignin, and put the beaker in a 30°C constant temperature water bath. The lignin alkali solution is electrolyzed under the DC stabilized power supply, and the anode is Pb / PbO 2 electrode, the cathode is a Ni electrode, and the current density is 30mA / cm 2 , the electrode working area is 24cm 2 . After 2 hours, the electrolysis was stopped to obtain a lignin degradation mother liquor. After adding 200mL chloroform to the degradation mother liquor, dilute sulfuric acid (0.86mol / L) was added dropwise while stirring to adjust the pH value of the solution to 1-2, the degradation products were extracted into the organic phase chloroform, and the remaining residue lignin was in the All precipitated from the mother liquor under acidic conditions. The residual lignin separated by filtration was washed with...

Embodiment 2

[0033] Dissolve 4g of corn stalk lignin in 200mL of sodium hydroxide solution (1mol / L), and apply a current density of 10mA / cm between the two electrodes 2 , Electrocatalytic degradation reaction time 4h. Other steps are with embodiment 1. The molecular weight distribution data of lignin residues and the yield of aromatics in degradation products are shown in Table 1.

Embodiment 3

[0035] Dissolve 2g of corn stalk lignin in 200mL of sodium hydroxide solution (0.6mol / L), and apply a current density of 20mA / cm between the two electrodes 2 , Electrocatalytic degradation reaction time 6h. Other steps are with embodiment 1. The molecular weight distribution data of lignin residues and the yield of aromatics in degradation products are shown in Table 1.

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Abstract

The invention provides a method for preparing aromatic compounds by conducting hydrogenation and depolymerization on spruce lignin through the electro-catalysis technology. According to the method, electrocatalytic oxidation is conducted in a sodium hydroxide solution so that the lignin can be degraded, meanwhile, degradation intermediates in the spruce lignin are subjected to hydrogenation reduction through cooperation of electro-catalysis, that is, an electrolytic reaction tank is composed of a Pb/PbO2 electrode and a Ni electrode, a lignin alkaline solution serves as an electrolyte solution, part of chemical bonds in the lignin are subjected to oxidative cleavage by active substances (hydroxyl radical.OH or peroxy-anion radical O2<->) generated on the surface of the anode (the Pb/PbO2 electrode) through electrolysis alkaline water, the molecular weight of the lignin is effectively reduced, depolymerized compound intermediates are subjected to hydrogenation reduction by adsorption hydrogen atoms (Hads) generated on the surface of the cathode (the Ni electrode) through the electrolysis alkaline water, and finally, aromatic products including methylbenzene, ortho-xylene and m-xylene are obtained.

Description

technical field [0001] The content of the present invention belongs to the field of biomass energy chemical industry, and relates to a method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin using electrocatalysis technology, that is, using the active species (hydroxyl radical·OH or Peroxide anion radical O 2 ·- ) to oxidize and break part of the chemical bonds in lignin, so that lignin can be effectively depolymerized and its molecular weight is reduced. At the same time, the hydrogen atoms (H ads ) on the intermediates of lignin cracking by hydrogenation reduction, and finally obtain stable and valuable aromatic compounds. [0002] technical background [0003] Lignin is a natural renewable polymer material with extremely rich content, accounting for about a quarter of woody plants. Due to lignin's aromaticity and high degree of polymerization network structure, lignin is difficult to be effectively degraded. Therefore, most of...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B3/25
CPCC25B3/25
Inventor 黎钢尚园园范红显张松梅
Owner HEBEI UNIV OF TECH
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