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Catalytic thermal cracking method for lignin

A catalytic cracking and lignin technology, applied in the field of lignin catalytic thermal cracking, can solve the problem of difficult liquefaction of fibers

Inactive Publication Date: 2010-09-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of lignin has been produced, but due to the obvious difference in structure between lignin and cellulose, they are different in thermal cracking. It is more difficult to liquefy than fiber, and there is a large amount of pure lignin, which is not available as waste. Therefore, the research on the liquefaction of lignin into aromatic compounds and the preparation of high-octane fuels or aromatic chemicals has attracted much attention

Method used

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  • Catalytic thermal cracking method for lignin
  • Catalytic thermal cracking method for lignin
  • Catalytic thermal cracking method for lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, pyrolysis sodium lignosulfonate

[0026] Take 1 part by mass of sodium lignosulfonate (KL), and place these sodium lignosulfonates in the side pipe of the reactor. Connect the collecting device, and pass nitrogen gas (100ml / min) into the upper end. When the furnace temperature rises to 500°C. The lignin is added slowly so that the lignin is catalytically pyrolyzed through the high temperature zone. The products of catalytic pyrolysis of lignin are separated to obtain liquid, gas and solid products. Use the above method to test the cracking conditions at 600°C, 700°C, and 800°C respectively.

Embodiment 2

[0027] Embodiment 2, catalytic cracking sodium lignosulfonate

[0028] Take 1 part of ZSM-5 molecular sieve catalyst, and place these catalysts in the middle and lower part of the reactor; take 1 part of sodium lignosulfonate, and place the lignin in the side pipe of the reactor; the lower end of the reactor is connected with a liquid condensation device and tail gas Collecting device, feed nitrogen (100ml / min) at the upper end, when the furnace temperature rose to 600°C, slowly add lignin (the amount of feed is related to the reaction device, for the experimental device used in the embodiment, the amount of feed is 0.15 g / min), so that lignin is catalytically pyrolyzed through the high temperature zone. The products of catalytic pyrolysis of lignin are separated to obtain liquid, gas and solid products.

Embodiment 3

[0029] Embodiment 3, catalytic cracking sodium lignosulfonate

[0030] Take 1 part of HZSM-5 molecular sieve catalyst, and place these catalysts in the middle and lower part of the reactor. Take 1 part of sodium lignosulfonate and place the lignin in the side pipe of the reactor. Connect the collecting device, and pass nitrogen gas (100ml / min) into the upper end. When the furnace temperature rises to 600°C. Lignin was slowly added (at a rate of 0.15 g / min) such that the lignin was passed through a high temperature zone to catalyze thermal cracking. The products of catalytic pyrolysis of lignin are separated to obtain liquid, gas and solid products.

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Abstract

The invention discloses a catalytic thermal cracking method for lignin. The method comprises the following steps: preheating a molecular sieve catalyst to 200-300 DEG C, gradually adding lignin into the molecular sieve catalyst to carry out catalytic cracking reaction under the temperature of 500-800 DEG C and in the protective atmosphere of inert gas, separating the catalytic thermal cracking product of lignin after the reaction to obtain liquid, gas and solid products. By GC / MS analysis, the main components of the liquid product comprise benzene, toluene, ethylbenzene, naphthalene and other aromatic compounds, which account for 70%-80% of the total mass of the liquid products. The gas product is measured by GC, in which the volume of methane and carbon monoxide accounts for over 90% of that of the total gas. The main component of the solid product is carbon the mass fraction of which is between 75% and 85%. The products can be used for preparing fuel or aromatic chemicals.

Description

technical field [0001] The invention relates to a method for catalytic pyrolysis of lignin. Background technique [0002] Nowadays, due to the extensive exploitation and use of coal, oil and natural gas, a large amount of carbon dioxide, sulfur dioxide and other gases are emitted. Not only has it caused increasingly serious environmental problems, but also due to the massive exploitation of fossil fuels, the reserves of fossil fuels such as coal, oil and natural gas that can be exploited on the earth are less and less, so it is very necessary to find and develop renewable energy Yes, and biomass energy can just solve these problems. Biomass is the only kind of renewable energy that can obtain liquid fuel, and it has been widely concerned by countries all over the world. Lignin is one of the important components of biomass, and lignin is a three-dimensional network of complex natural aromatic oxygen-containing phenylpropane monomer precursors (guaiacyl, syringyl and p-hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00C10B53/02
CPCY02E50/14Y02E50/10
Inventor 傅尧赵岩邓理郭庆祥
Owner UNIV OF SCI & TECH OF CHINA
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