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A method for preparing 4-ethylphenol by catalytic pyrolysis of bagasse by activated carbon

A technology for catalytic pyrolysis and ethyl phenol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of low yield of 4-ethyl phenol, difficult practical application, and expensive palladium-based precious metal catalysts and other problems, to achieve the effect of reducing oxygen content and low cost

Active Publication Date: 2021-02-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Chinese patent application 201410558325.1 reported the use of palladium-based noble metal catalysts to prepare 4-ethylphenol by catalytic pyrolysis of biomass. Due to the high price of palladium-based noble metal catalysts, it is difficult for practical application, which greatly limits the industrial application of this technology
[0004] In addition, Lu Qiang et al. in "Catalyticfast pyrolysis of bagasse using activated carbon catalyst to selectively produce 4‐ethyl phenol, Energy&Fuels, 2016, 30, 10618-10626" In this paper, it was reported for the first time that activated carbon was used as catalyst to prepare 4-ethylphenol by catalytic pyrolysis of bagasse under nitrogen atmosphere. Although activated carbon showed certain catalytic hydrogenation activity, 4-ethylphenol obtained based on this process The productive rate of base phenol is lower, and its productive rate is only 2.49% at the highest; and the selectivity in the organic liquid product is only 10.71% at the highest

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 100g of dry rice husk (0.1-0.3mm in particle size) was used as raw material, then raised from room temperature to 400°C at a rate of 15°C / min under an inert atmosphere and carbonized at a constant temperature for 1 hour, and then cooled under a steam atmosphere to The heating rate was 25°C / min from room temperature to 800°C and activated at a constant temperature for 2 hours. After cooling, 29 g of activated carbon was obtained.

[0025] Get 10g of above-mentioned gac as catalyst, get 10g bagasse (particle diameter is 0.1-0.3mm) as raw material, after the two are mechanically mixed, at 270 ℃, heating rate is greater than 800 ℃ / s, hydrogen and nitrogen concentration are respectively 11vol% and Under the atmosphere of 89vol% pyrolysis for 30s, the yield of liquid product obtained was 32.7%, and the content of 4-ethylphenol was analyzed by gas chromatography, and the yield of 4-ethylphenol was calculated to be 3.5%; 4-ethylphenol The content of base phenol in the organic l...

Embodiment 2

[0027] 15g of activated carbon prepared in Implementation 1 is used as a catalyst, and 10g of bagasse (particle size is 0.1-0.3mm) is taken as a raw material. After the two are mechanically mixed at 300°C, the heating rate is greater than 1000°C / s, and the concentrations of hydrogen and nitrogen are respectively Under the atmosphere of 10vol% and 90vol% pyrolysis for 25s, the yield of liquid product was 36.8%, and the content of 4-ethylphenol was analyzed by gas chromatography, and the yield of 4-ethylphenol was calculated to be 3.9%. ; The content of 4-ethylphenol in the organic liquid product (excluding water) was 20.2%.

Embodiment 3

[0029] Take 80g dry poplar wood (particle size 0.1-0.3mm) as raw material, then raise the temperature from room temperature to 500°C at a rate of 10°C / min in an inert atmosphere and carbonize at a constant temperature for 1.5h, then cool it under a steam atmosphere Raise the temperature from room temperature to 900°C at a rate of 30°C / min and activate at a constant temperature for 2.5 hours. After cooling, 22g of activated carbon is obtained.

[0030] Get 8g of above-mentioned gac as catalyst, get 16g bagasse (particle diameter is 0.1-0.3mm) as raw material, after the two are mechanically mixed at 330 ℃, heating rate is greater than 700 ℃ / s, hydrogen and nitrogen concentration are respectively 12vol% and Under the atmosphere of 88vol% pyrolysis for 20s, the yield of liquid product obtained was 39.2%, and the content of 4-ethylphenol was analyzed by gas chromatography, and the yield of 4-ethylphenol was calculated to be 3.1%; 4-ethylphenol The content of phenol in the organic l...

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Abstract

The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing 4-ethylphenol by catalyzing and pyrolyzing bagasse with activated carbon. The invention uses bagasse as a raw material and activated carbon as a catalyst. The activated carbon is prepared from biomass through a steam activation method; after the bagasse is mechanically mixed with the above-mentioned activated carbon, catalytic pyrolysis is carried out under a hydrogen atmosphere at 240-410°C After the pyrolysis gas is condensed, a liquid product rich in 4-ethylphenol can be obtained; the yield of 4-ethylphenol and its purity in the liquid product are both high. In addition, the method of the present invention uses bagasse from a wide range of sources as a raw material and low-cost activated carbon as a catalyst, which can significantly reduce the production cost of 4-ethylphenol.

Description

technical field [0001] The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing 4-ethylphenol by catalyzing and pyrolyzing bagasse with activated carbon. Background technique [0002] 4-Ethylphenol is a colorless needle-shaped crystal with a special smell, which is widely used as a raw material for phenolic resin, rubber anti-aging agent, plastic anti-aging agent, surfactant, non-ionic emulsifier, synthetic fragrance, and pesticide , edible spices, organic synthesis intermediates and chemical reagents. Although the Chinese patent application 201010123979.3 has disclosed the preparation method of 4-ethylphenol, the raw materials are not widely used, so that the economical efficiency of the preparation of 4-ethylphenol is difficult to guarantee. [0003] As an important biomass resource, bagasse is an environmentally friendly renewable resource. Bagasse can produce more 4-vinylphenol in the conventional low-temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/00C07C39/06
CPCC07C37/003C07C37/004C07C39/06
Inventor 陆强叶小宁王昕郭浩强周民星董长青杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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