A method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin using electrocatalytic technology

A technology for aromatic hydrocarbon compounds and corn stalks, which is applied in the electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of high equipment requirements, high production costs, harsh processes, etc., and achieves the effect of high application value and stable properties.

Inactive Publication Date: 2018-08-28
HEBEI UNIV OF TECH
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  • 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 other products, but the price of Pt was expensive.
[0004] Summarizing the existing lignin degradation methods, it can be seen that there are still problems with harsh processes and high equipment requirements, such as supercritical technology of high temperature and high pressure; hydrogenation technology is used for hydrogenation and depolymerization of lignin, and hydrogen itself is a clean resource; Catalyst precious metals lead to too high production costs

Method used

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  • A method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin using electrocatalytic technology
  • A method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin using electrocatalytic technology
  • A method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin using electrocatalytic technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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

[0032] 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

[0034] 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 relates to a method for preparing aromatic compounds by hydrogenation and depolymerization of corn stalk lignin by electrocatalysis technology. The method degrades lignin by electrocatalytic oxidation in sodium hydroxide solution, and at the same time cooperates with electrocatalytic hydrogenation to reduce the degradation intermediate of corn straw lignin, that is, uses Pb / PbO2 electrode and Ni electrode to form an electrolytic reaction cell and lignin alkali solution as Electrolyte solution, the active species (hydroxyl free radical·OH or peroxide negative ion free radical O2•‑) produced by electrolysis of alkaline water on the surface of the anode (Pb / PbO2 electrode) oxidizes and breaks some of the chemical bonds in lignin, making the molecular weight of lignin effective The depolymerized compound intermediates are hydrogenated and reduced by the adsorbed hydrogen atoms (Hads) generated on the surface of the cathode (Ni electrode) by electrolysis of alkaline water, and finally aromatic products such as toluene, o-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. technical background [0002] 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 the by-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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