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
CN106676574AInactive Publication Date: 2017-05-17HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2017-05-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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