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Wood-pellet active carbon and preparation method thereof

A technology of wood activated carbon and wood particles, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of greatly reduced performance and working capacity, uneven distribution of pore structure and pore volume, and large gas flow resistance, etc. To achieve the effect of enhancing the adsorption and desorption effect, the effective pore size and pore volume, and the stable pore structure

Inactive Publication Date: 2018-05-04
玉山县三清活性炭有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process of activated carbon for automobile canisters used in the field of automobile production in my country is to use wood chips as raw materials, which are made by crushing, mixing, extrusion, drying, carbonization, and activation. The activated carbon produced in this way has the following defects : (1) The strength is low, because the wood chips are stirred and extruded with the chemical activator phosphoric acid, and then activated by high-temperature carbonization, and the wood chips will inevitably shrink and crack during the high-temperature carbonization activation after molding, and will occur during production. The mutual friction and collision between charcoal and charcoal will greatly reduce the strength of activated carbon. The product has low strength, uneven strength, severe powder loss, and is brittle.
(2) Poor adsorption and desorption performance, low service life
This production process of forming first and then carbonizing and activating cannot meet the production needs of high-quality formed activated carbon in the market, because activated carbon mainly produces effective pore size and pore volume in the process of carbonization and activation, that is to say, the more effective pore size and pore volume, the more The better the adsorption and desorption performance of developed activated carbon is, the existing traditional process is to adopt the production process of forming first and then activating. The product obtained by carbonization and activation, the product obtained by this production process, its pore structure and the distribution of pore size and pore volume are not uniform. It is found through the detection of pore structure and specific surface area analyzer that the surface pore diameter has 2 -7mn, the specific surface area is 1500 m 2 / g, while the middle part of the particle is only 0.5-2mn, and the specific surface area is only about 800; therefore, the activated carbon produced by the traditional process can only be adsorbed on the surface, and the activated carbon produced in this way only has a certain pore size, pore volume and functional groups on the surface. , it is difficult to have a standard pore volume inside, so its performance and working capacity will be greatly reduced, resulting in its short service life, poor performance and other defects
(3) The gas flow resistance is large, because the more developed the pore size and pore volume of activated carbon, the less its gas flow resistance, and the above-mentioned production process only has a certain pore size and pore volume on the surface, and the middle of the carbon cannot get effective. Carbonization activation, resulting in no pore size and pore volume inside the carbon column, so it has a large flow resistance to gas, which is not conducive to the adsorption and desorption of volatile solvents by activated carbon, reducing the recycling rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Wood granular activated carbon in the present embodiment, its main raw material composition weight ratio is woody activated carbon powder: organic nano-bentonite: water=1: 0.2: 0.85, after three kinds of raw materials are stirred evenly, granulate, after granulation dries, carry out physical Prepared after activation, the wood activated carbon powder is mixed with aged wood chips and 85% thermal food-grade phosphoric acid according to the weight ratio of wood chips: thermal food-grade phosphoric acid=1:1.2, after fully stirring and static staining, then It is activated by high-temperature carbonization, recycled, rinsed, dried and powdered. It is columnar or spherical granular activated carbon, and the particle size and length are generally controlled at 2.0mm in particle size and 3-6mm in length.

[0027] The present embodiment also proposes a kind of preparation method of woody activated carbon, comprises two main operations, and the first operation is the system wood...

Embodiment 2

[0044] Wood particle activated carbon in the present embodiment, its main raw material composition weight ratio is wood activated carbon powder: organic nano-bentonite: water=1: 0.22: 0.9, three kinds of raw materials are stirred after granulation, after granulation dries, carry out physical Prepared after activation, the wood activated carbon powder is mixed with aged wood chips and 85% thermal food-grade phosphoric acid according to the weight ratio of wood chips: thermal food-grade phosphoric acid=1:1.3, after fully stirring and static staining, then It is activated by high-temperature carbonization, recycled, rinsed, dried and powdered. It is columnar or spherical granular activated carbon, and the particle size and length are generally controlled at 2.0mm in particle size and 3-6mm in length.

[0045]The present embodiment also proposes a kind of preparation method of woody activated carbon, comprises two main operations, and the first operation is the system woody activa...

Embodiment 3

[0062] Wood granular activated carbon in the present embodiment, its main raw material composition weight ratio is woody activated carbon powder: organic nano-bentonite: water=1: 0.25: 1.0, after three kinds of raw materials are stirred evenly, granulate, after granulation dries, carry out physical Prepared after activation, the wood activated carbon powder is mixed with aged wood chips and 85% thermal food grade phosphoric acid according to the weight ratio of wood chips: thermal food grade phosphoric acid = 1: 1.4, after fully stirring and static staining, then It is activated by high-temperature carbonization, recycled, rinsed, dried and powdered. It is columnar or spherical granular activated carbon, and the particle size and length are generally controlled at 2.0mm in particle size and 3-6mm in length.

[0063] The present embodiment also proposes a kind of preparation method of woody activated carbon, comprises two main operations, and the first operation is the system w...

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Abstract

The invention discloses wood-pellet active carbon and a preparation method thereof, and belongs to the field of active carbon for a car carbon tank and a preparation method for the active carbon. Thewood-pellet active carbon adopts main raw material components of wooden activate carbon to organic sodium-based bentonite to water of 1 to (0.2-0.25) to (0.8-1.0), the three raw materials are uniformly mixed and then are pelletized, and are physically activated after being pelletized and dried in air to prepare the wood-pellet active carbon; the wood active carbon is prepared by mixing aged saw dust and hot-process food-stage phosphoric acid with concentration of 85% in a weight ratio of 1 to (1.2-1.5); the raw materials are sufficiently stirred and stewed, are carbonized and activated at a high temperature, are recycled, are rinsed, are dried in air and are prepared into powder. The preparation method comprises two main processes of preparing wood active carbon powder and preparing wood-pellet active carbon. The wood-pellet active carbon is high in product strength, is more advanced in effective aperture pore volume, is more uniform in distribution, is good in adsorption and desorption performance, and is small in gas flowing resistance.

Description

technical field [0001] The invention relates to the field of activated carbon for automobile canisters and a preparation method, in particular to a wood particle activated carbon combined with a chemical activation method and a physical activation method and a preparation method thereof. Background technique [0002] At present, with the increasingly stringent emission standards of automobiles and the mature application of automobile exhaust purification technology, the proportion of hydrocarbons in exhaust gas after fuel evaporation is gradually increasing in vehicle emissions. The carbon canister is a key component of gasoline vehicle fuel evaporation control, and its core material is shaped activated carbon for gasoline adsorption and desorption. The shaped activated carbon required by the carbon canister technology has a high specific surface area and high strength, requires an effective pore volume of 2-5mn, and must have the function of quickly adsorbing and desorbing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/342
Inventor 郑迅荟郑宇杰
Owner 玉山县三清活性炭有限公司
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