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A method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon

A phenolic substance, catalytic pyrolysis technology, applied in the preparation of organic compounds, chemical instruments and methods, production of bulk chemicals, etc. The effect of continuous and efficient preparation and wide application prospects

Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although biomass pyrolysis can obtain high value-added phenolic substances, the concentration in liquid oil is very low and it is difficult to purify

Method used

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  • A method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon
  • A method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon
  • A method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon

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Embodiment 1

[0040] The embodiment of the present invention describes a method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon, and the method specifically includes the following steps:

[0041] S1: crush and sieve the bamboo to a size smaller than 120 mesh, put it in an oven at 105°C for 24 hours, and obtain the pyrolysis raw material;

[0042]S2: Use a fixed-bed reactor with a diameter of 45mm and a length of 60mm for pyrolysis. After heating the reactor to a specified temperature of 600°C, quickly send 2g of biomass mixture into the middle of the reactor for a reaction time of 30min. The substance is fully decomposed, the total flow of argon and ammonia is 200mL / min, and the proportion of ammonia is 10%, and a nitrogen-doped carbon catalyst is obtained;

[0043] S3: Fully mix the biomass waste in step S1 with the nitrogen-doped carbon catalyst in step S2 at a mass ratio of 2:1, and perform a rapid catalytic pyrolysis reaction on the mixt...

Embodiment 2

[0047] This embodiment is the same as Embodiment 1, except that the proportion of ammonia gas is 30%.

[0048] The content (selectivity) of phenolic substances in the obtained biomass catalytic pyrolysis liquid oil reaches more than 80%, the selectivity of 4-ethylphenol reaches 12%, and the selectivity of 4-vinylphenol with higher added value reaches up 31%.

Embodiment 3

[0050] This embodiment is the same as Embodiment 1, except that the proportion of ammonia gas is 50%.

[0051] The content (selectivity) of phenolic substances in the obtained biomass catalytic pyrolysis liquid oil reaches more than 80%, the selectivity of 4-ethylphenol reaches 10%, and the selectivity of 4-vinylphenol with higher added value reaches up 27%.

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Abstract

The invention discloses a method for catalytically pyrolyzing biomass with nitrogen-doped carbon to prepare phenolic substances. The preparation process is as follows: after crushing and drying the biomass, rapid pyrolysis is performed under ammonia gas to obtain a product with developed porosity and rich Nitrogen-doped carbon catalyst containing active nitrogen-containing functional groups; a large amount of high value-added phenolic substances can be obtained by using nitrogen-doped carbon catalyst to catalyze the pyrolysis of biomass. In the catalytic pyrolysis process, the nitrogen-doped carbon catalyst of the present invention serves as a catalyst and hydrogen donor, which greatly promotes the formation of simple high value-added phenolic substances, and has high selectivity for 4-ethylphenol and 4-vinylphenol. , it is easy to separate and purify in the later stage to prepare higher value-added chemical products; and the pyrolysis gas and coke by-products can also be used as gas and fertilizer respectively. The method of the invention is beneficial to realizing high-value utilization of biomass waste.

Description

technical field [0001] The invention relates to the field of biomass utilization, in particular to a method for preparing phenolic substances by catalyzing and pyrolyzing biomass with nitrogen-doped carbon. Background technique [0002] my country's biomass resource reserves are huge, and a large amount of biomass waste is produced every year. If it is not used rationally, it may cause serious pollution to the environment. Biomass waste can be enriched with oxygen-containing compounds through pyrolysis, and some of these compounds have high added value, such as furfural, L-glucose, L-glucosone, and phenols. As bulk chemicals, phenolic substances have broad application prospects, such as the production of phenolic resins, bisphenols, phenolphthalein, caprolactam, salicylic acid and other chemical products, as well as important intermediates for dyes, photosensitive materials, spices, antioxidants and other products body. And with the development of phenolic oil products, th...

Claims

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Application Information

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IPC IPC(8): C07C37/00C07C39/06C07C39/20B01J27/24B01J35/10
CPCC07C37/004B01J27/24B01J35/613B01J35/615C07C39/06C07C39/20Y02P20/52
Inventor 陈汉平陈伟陈应泉杨海平王贤华邵敬爱张雄杨晴张世红
Owner HUAZHONG UNIV OF SCI & TECH