Method for preparing nutshell activated carbon by pyrolyzing activation technology and activated carbon

A technology of fruit shell activated carbon and activated carbon, which is applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of low product yield and high energy consumption, achieve good adsorption performance, developed pore structure, and good heat storage effect Effect

Active Publication Date: 2012-08-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0007] In order to solve the shortcomings of the existing activated carbon physical method production technology such as the need for activators such as water vapor, carbon dioxide or high-temperature flue gas, high energy consumption, and low product yield, the invention provides a method for preparing activated carbon from fruit shells by pyrolysis activation And activated carbon, the preparation process is simple and fast, the product yield is high, the cost is low, and the adsorption performance is good

Method used

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  • Method for preparing nutshell activated carbon by pyrolyzing activation technology and activated carbon
  • Method for preparing nutshell activated carbon by pyrolyzing activation technology and activated carbon
  • Method for preparing nutshell activated carbon by pyrolyzing activation technology and activated carbon

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Effect test

Embodiment 1

[0032] (1) Raw material crushing: crush the air-dried coconut shell raw material, sieve, take 0.85-2.00mm particles, and dry at 120°C.

[0033] (2) Airtight pretreatment before reaction: put 10g (13.15ml) coconut shell raw material in a 100ml ceramic pyrolysis reactor, and use clay or other airtight materials to seal the gap.

[0034] (3) Pyrolysis: Put the closed pyrolysis reactor containing coconut shell raw materials in a high-temperature furnace, raise the temperature to the pyrolysis temperature of 700°C at a heating rate of 10°C / min, and keep it for a certain period of time for 4 hours. At the end, the sample is taken out, washed with acid and water until neutral, and dried to become an activated carbon sample. The yield of activated carbon is 24.4%, and the specific surface area is 558m 2 / g, the iodine adsorption value is 767mg / g, and the methylene blue adsorption value is <15ml / g.

Embodiment 2

[0036](1) Raw material crushing: crush the air-dried coconut shell raw material, sieve, take 0.85-2.00mm particles, and dry at 120°C.

[0037] (2) Airtight pretreatment before reaction: put 10g (13.15ml) coconut shell raw material in a 100ml ceramic pyrolysis reactor, and use clay or other airtight materials to seal the gap.

[0038] (3) Pyrolysis: Put the closed pyrolysis reactor with coconut shell raw materials in a high-temperature furnace, raise the temperature to the pyrolysis temperature of 800°C at a heating rate of 10°C / min, and keep it for a certain period of time for 4 hours. At the end, the sample is taken out, washed with acid and water until neutral, and dried to become an activated carbon sample. The yield of activated carbon is 22.3%, and the specific surface area is 704m 2 / g, the iodine adsorption value is 892mg / g, and the methylene blue adsorption value is 30ml / g.

Embodiment 3

[0040] (1) Raw material crushing: crush the air-dried coconut shell raw material, sieve, take 0.85-2.00mm particles, and dry at 120°C.

[0041] (2) Airtight pretreatment before reaction: put 10g (13.15ml) coconut shell raw material in a 100ml pyrolysis reactor and airtight.

[0042] (3) Pyrolysis: Put the airtight pyrolysis reactor containing coconut shell raw materials in a high-temperature furnace, raise the temperature to the pyrolysis temperature of 900°C at a heating rate of 10°C / min, and keep it warm for a certain period of time for 4 hours. At the end, the sample is taken out, washed with acid and water until neutral, and dried to become an activated carbon sample. The yield of activated carbon is 18.3%, and the specific surface area is 994m 2 / g, the iodine adsorption value is 1295 mg / g, and the methylene blue adsorption value is 135 ml / g.

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Abstract

The invention provides a method for preparing nutshell activated carbon by a pyrolyzing activation technology and activated carbon. The method takes fragmented dry nutshells as raw materials, which are pyrolyzed under a pyrolysis temperature, and then pickled, washed, and dried so as to obtain activated carbon. Specifically, the raw materials are put in a ceramic pyrolysis reactor first, and the ceramic pyrolysis reactor is filled with air and sealed completely, then pyrolysis is carried out under a pyrolysis temperature of 700-1000DEG C for 1-10h. The prepared activated carbon has a specific surface area of 500-2300m<2>/g, a yield of 5-40%, and an iodine adsorption value of 470-1930mg/g. The one-step pyrolyzing activation method provided in the invention for preparing nutshell activated carbon with high adsorption performance needs no water vapor, phosphoric acid or zinc chloride and other activating agents. The prepared product has high yield and excellent adsorption performance. And the preparation technology is green, clean, and has short process as well as low cost.

Description

technical field [0001] The invention relates to an activated carbon and a preparation method thereof, in particular to a clean and pollution-free preparation method of the activated carbon with excellent adsorption performance. Background technique [0002] At present, the preparation method of activated carbon usually adopts chemical activation method and physical activation method. The chemical activation method needs to use a large amount of chemical agents such as phosphoric acid and zinc chloride, which is easy to generate waste water and waste gas, and severely corrodes equipment; the physical activation method requires a large amount of high-temperature water vapor. Or flue gas, high energy consumption, long time, and low product yield. Therefore, the key to the preparation of activated carbon is to develop a process that is fast, easy, energy-saving, and low-cost. [0003] Zhang Huiping from South China University of Technology and Xiamen University (Zhang Huiping,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/324
Inventor 蒋剑春刘雪梅孙康徐凡邓先伦许玉
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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