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Method for preparing active carbon by using carbon byproduct of fast pyrolysis of larchwood

A technology for preparing activated carbon and larch, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high cost of activated carbon preparation, high cost of reducing gas, low energy utilization rate, etc., and achieve high energy utilization rate , good adsorption performance and high comprehensive utilization

Active Publication Date: 2012-01-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process of preparing activated carbon needs to go through two steps of carbonization and activation. The cost of reducing gas in the mixed gas activator is high, and the activation time is long, resulting in high cost of activated carbon preparation, high energy consumption, and low energy utilization.

Method used

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  • Method for preparing active carbon by using carbon byproduct of fast pyrolysis of larchwood
  • Method for preparing active carbon by using carbon byproduct of fast pyrolysis of larchwood

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Fast pyrolysis of larch wood at 550°C to obtain pyrolytic charcoal and pyrolysis gas;

[0024] (2) Condensing the above-mentioned pyrolysis gas at 35° C. to obtain pyrolysis oil and non-condensable gas. The pyrolysis oil contains heavy pyrolysis oil, medium pyrolysis oil and light pyrolysis oil;

[0025] (3) Combusting the above-mentioned non-condensable gas in air to obtain an activated gas composed of carbon dioxide and water vapor;

[0026] (4) Take 100g of the above-mentioned pyrolytic charcoal, use the above-mentioned activated gas as an activator to activate the above-mentioned pyrolytic charcoal, the activation reaction temperature is: 800°C, the heating rate is 6°C / min, the activation time is 15 minutes, and cooled to At room temperature, an activated carbon product is obtained. The yield is 42.6%, the iodine adsorption value is 936 mg / g, and the methylene blue adsorption value is 173 mg / g.

[0027] (5) Return the high-temperature tail gas generated during...

Embodiment 2

[0029] (1) Fast pyrolysis of larch wood at 550°C to obtain pyrolytic charcoal and pyrolysis gas;

[0030] (2) Condensing the above-mentioned pyrolysis gas at 25° C. to obtain pyrolysis oil and non-condensable gas. The pyrolysis oil contains heavy pyrolysis oil, medium pyrolysis oil and light pyrolysis oil;

[0031] (3) Combusting the above-mentioned non-condensable gas in air to obtain an activated gas composed of carbon dioxide and water vapor;

[0032] (4) Take 100g of the above-mentioned pyrolytic charcoal, use the above-mentioned activated gas as an activator to activate the above-mentioned pyrolytic charcoal, the activation reaction temperature is: 850°C, the heating rate is 10°C / min, the activation time is 30 minutes, and cooled to At room temperature, an activated carbon product is obtained. The yield is 36.8%, the iodine adsorption value is 987 mg / g, and the methylene blue adsorption value is 136 mg / g.

[0033] (5) Return the high-temperature tail gas generated durin...

Embodiment 3

[0035] (1) Fast pyrolysis of larch wood at 550°C to obtain pyrolytic charcoal and pyrolysis gas;

[0036] (2) Condensing the above pyrolysis gas at 30°C to obtain pyrolysis oil and non-condensable gas, the pyrolysis oil contains heavy pyrolysis oil, medium pyrolysis oil and light pyrolysis oil;

[0037] (3) Combusting the above-mentioned non-condensable gas in air to obtain an activated gas composed of carbon dioxide and water vapor;

[0038] (4) Take 100g of the above-mentioned pyrolytic charcoal, use the above-mentioned activated gas as an activator to activate the above-mentioned pyrolytic charcoal, the activation reaction temperature is: 900°C, the heating rate is 8°C / min, the activation time is 20 minutes, and cooled to At room temperature, an activated carbon product is obtained. The yield is 40.2%, the iodine adsorption value is 962 mg / g, and the methylene blue adsorption value is 168 mg / g.

[0039] (5) Return the high-temperature tail gas generated during the activat...

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Abstract

The invention relates to a method for preparing active carbon by using the carbon byproduct of the fast pyrolysis of larchwood, which belongs to the technical field of active carbon preparation. The method comprises the following steps of: fast pyrolyzing the larchwood to obtain pyrolytic carbon and pyrolytic gas; condensing the pyrolytic gas to obtain pyrolytic oil and uncondensable gas, and combusting the uncondensable gas in the air to obtain active gas; and activating the pyrolytic carbon by using the active gas as an activator, and cooling to room temperature to obtain the active carbon,wherein the high-temperature tail gas generated in the activation process is recycled. The method of the invention has the advantages that: an external heat source and the external activator are not used in the activation process; the comprehensive use efficiency of the pyrolytic product is high, and environmental pollution is light; the process for preparing the active carbon is simple, has highenergy use efficiency, realizes the recycling of the heat and saves energy sources; and the obtained active carbon has high absorption performance, meets national standards in various indexes and canbe widely applied to gas-phase absorption and decolorization of chemical products.

Description

technical field [0001] The invention relates to a method for preparing activated carbon by using the by-product carbon of rapid pyrolysis of larch wood, and belongs to the technical field of activated carbon preparation. Background technique [0002] Activated carbon has developed pore structure, huge specific surface area, unique surface functional groups, strong adsorption capacity and good chemical stability, so it is widely used in various fields of industrial production such as pharmaceuticals, chemicals, and food. The traditional raw materials for preparing activated carbon are mainly natural mineral plants such as coal and solid wood. However, the reserves of coal are limited and the source of woody raw materials is limited. Therefore, it is very necessary to choose a suitable raw material to replace traditional raw materials for the production of activated carbon. [0003] Biomass energy is a clean and renewable energy source. Biomass rapid pyrolysis technology is an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 常建民韩彦雪张立塔苟进胜王鹏起许守强
Owner BEIJING FORESTRY UNIVERSITY