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A method for catalytic depolymerization of lignin

A catalytic depolymerization and lignin technology, applied in the field of organic synthesis, can solve problems such as complex reaction mechanism, low depolymerization efficiency, complex products, etc., and achieve the effect of simple product separation and purification, simple catalyst recovery, and reduced use cost

Active Publication Date: 2020-04-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The prior art using homogeneous acid to catalyze the depolymerization of lignin has been widely used, but it inevitably faces some problems, such as complicated post-treatment, corroded reactor, difficulty in catalyst recovery, etc.
It is precisely because of the complex reaction mechanism of lignin depolymerization, the harsh reaction conditions in the depolymerization process, poor selectivity of depolymerization products, complex products, difficult separation and purification of products, and low depolymerization efficiency.

Method used

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  • A method for catalytic depolymerization of lignin
  • A method for catalytic depolymerization of lignin
  • A method for catalytic depolymerization of lignin

Examples

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Effect test

Embodiment 1

[0038] With Ti(SO 4 ) 2 and Zr(NO 3 ) 4 A series of mixed oxides with different Ti / Zr ratios were synthesized and expressed as TZx, where x represents the ratio of zirconium to titanium (for example, TZ30 represents a titanium-zirconium composite oxide, in which zirconium is 30% by mass relative to titanium) . Specifically: a certain amount of Ti(SO 4 ) 2 and Zr(NO 3 ) 4 · 5 h 2 O was dissolved in deionized water, respectively, so that the concentrations of the final Ti-containing solution and Zr-containing solution were both 0.3 mol / L. According to the requirements, select a certain amount of two solutions and mix and stir to form a uniform solution. After 1 h, an aqueous ammonia solution (28.0-30.0 wt%) was added dropwise until the pH of the solution was about 10, and then aged at 25° C. with vigorous stirring for 24 h. Afterwards, the suspension was centrifuged and washed with deionized water until the final pH = 7. The resulting precipitate was dried at 110° C. ...

Embodiment 2

[0041] Stir 1 g of the prepared amorphous carrier TZ30, 0.20 g of cobalt chloride hexahydrate and 0.06 g of nickel chloride hexahydrate in 100 mL of deionized water, and after stirring for 4 hours, add 100 mL of 30 mmol / L sodium carbonate solution , continue to stir for 3 hours, add 30mL 20mmol / L sodium borohydride at 0°C in an ice bath for reduction, filter, wash with deionized water until neutral, and calcinate at 400°C for 1h under the protection of argon to obtain nickel / cobalt with a molar ratio of 1 / 3, nickel and cobalt loading of 6wt% nickel-cobalt alloy loaded on the amorphous composite carrier Ni-Co / TZ30 catalyst.

Embodiment 3

[0043] Stir 1 g of the prepared amorphous carrier TZ30, 0.129 g of cobalt chloride hexahydrate and 0.129 g of nickel chloride hexahydrate in 100 mL of deionized water, and after stirring for 4 hours, add 100 mL of 30 mmol / L sodium carbonate solution , continue to stir for 3 hours, add 30mL 20mmol / L sodium borohydride at 0°C in an ice bath for reduction, filter, wash with deionized water until neutral, and calcinate at 400°C for 1h under the protection of argon to obtain nickel / cobalt with a molar ratio of 1 / 1, nickel and cobalt loading of 6wt% nickel-cobalt alloy loaded on the amorphous composite support Ni-Co / TZ30 catalyst.

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Abstract

The invention provides a method for catalyzing and depolymerizing lignin. The method comprises the steps: the lignin and a catalyst are mixed to be subjected to a catalyzing and depolymerizing reaction, and a depolymerized product is obtained; the catalyst is selected as an amorphous composite carrier or an amorphous composite carrier loaded with a transition metal catalyst; the amorphous composite carrier is titanium and zirconium composite oxide; the transition metal catalyst is one or more of nickel, cobalt, zinc, iron, copper and an alloy catalyst; and metal in the alloy catalyst is two ormore of nickel, cobalt, zinc, iron and copper. Thus, according to the method, the depolymerizing rate is high, especially the yield of small molecular compounds extracted from petroleum ether is high, product separation and purification are easy, moreover, separation of the depolymerized product and the catalyst is easy, and environmental friendliness is achieved; and the catalyst can be recycledfor multiple times and stably maintains high catalytic activity, the catalyst is easy to recycle, and the using cost of the catalyst is comprehensively lowered.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for catalytically depolymerizing lignin. Background technique [0002] With the increasing demand for energy in the entire human society, as well as the increasingly serious problems of fossil energy depletion and environmental pollution, biomass as a renewable and clean energy has attracted much attention. Lignin is the second most abundant natural polymer in nature, and together with cellulose and hemicellulose, it forms the main structure of plants. Lignin is an amorphous, aromatic polymer containing oxyphenylpropanol or its derivatives in its molecular structure widely present in plants. It is a class of substances composed of polymerized aromatic alcohols, present in woody tissue, and its main function is to harden the cell wall by forming an interwoven network. Lignin is mainly located between cellulose fibers and acts as an anti-compression. In woody ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/08B01J23/755B01J23/75
Inventor 李文志祝超锋窦晓萌马隆龙
Owner UNIV OF SCI & TECH OF CHINA
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