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Method of preparing 4-ethylphenol by catalytically pyrolyzing bagasse with activated charcoal

A technology of catalytic pyrolysis and ethyl phenol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low yield of 4-ethyl phenol, difficult practical application, and limited industrial application, etc. Achieve the effect of low cost and low oxygen content

Active Publication Date: 2017-07-14
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 DEG C, heating rate is greater than 700 DEG C / 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 o...

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Abstract

The invention belongs to the field of utilization of biomass energy and particularly relates to a method of preparing 4-ethylphenol by catalytically pyrolyzing bagasse with activated charcoal. The method includes the steps of: preparing bagasse as a raw material and activated charcoal as a catalyst, wherein the activated charcoal is prepared by performing water vapor activation on biomass; mechanically mixing the bagasse with the activated charcoal and performing catalytic pyrolysis to the mixture at 240-410 DEG C in a hydrogen atmosphere, and condensing pyrolysis gas to prepare a liquid product being rich in the 4-ethylphenol. Yield of the 4-ethylphenol and purity thereof in the liquid product are high. The method employs the bagasse, which has wide source, as the raw material, and the activated charcoal, which is low in cost, as the catalyst, thus significantly reducing production cost of the 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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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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