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Spherical active carbon and process for producing the same

An activated carbon, spherical technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as increased pressure loss, inability to ensure surface area, dust control, etc., to achieve small pressure loss. Effect

Inactive Publication Date: 2007-05-02
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the above-mentioned use, there is a method of using crushed or granular activated carbon, but the crushed or granular shape has edges, so it is difficult to prevent damage from filling the container, or vibration caused by long-term use. The dust generated by the damage of the edge part is controlled to a minimum
In addition, due to the irregular filling, the pressure loss also tends to increase
On the other hand, for example, if a honeycomb molded body is used, the problem of dust generation can be reduced, but the surface area cannot be ensured as that of filled granular or powdered activated carbon, so the adsorption capacity tends to deteriorate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Coconut shell charcoal (85% carbon content) was finely pulverized to a particle size of 200 mesh (corresponding to a particle size of 75 μm) or less with a pulverizer. The central particle diameter of the obtained coconut shell carbide fine powder was 10 μm. Add 40 parts by weight of coal tar (60% of carbon content) and 10 parts by weight of water to 100 parts by weight of this coconut shell carbonization powder, carry out 20 minutes with the universal mixing mixer 30DM type (trade name) that dalton company makes with 68rpm revolution number of mixing. The resulting mixture was extruded into strips with a granulator (J2 type (trade name) manufactured by Ueda Iron Works Co., Ltd.), and cut to obtain pellet-shaped extruded products with a diameter of 1.6 mm and a length of 1.5-5 mm. Using HISPY-DOMIKISA-FS-G type (trade name) (capacity 10L, diameter 400mm) manufactured by Fukae Powertech Co., Ltd., the extruded product was molded at 60°C and 400rpm for 10 minutes to obta...

Embodiment 2

[0067] Follow the same conditions as in Example 1 above to the mixing step, extrude the resulting mixture into strips with a granulator, and cut to obtain a granular extruded product with a diameter of 3.5 mm and a length of 3-9 mm. This extruded product was treated under the same conditions as in Example 1 to obtain spherical activated carbon with an average particle diameter of 4.5 mm.

[0068] The MS hardness of the obtained spherical activated carbon was 91.9%. Average particle size x=4.5mm, so 100×(1-0.8×1.45 (0.3-x) )=83.2, the MS hardness of the spherical activated carbon is higher than this value. The benzene adsorption amount of the spherical activated carbon is 43.0%, the filling specific gravity is 0.54g / ml, and the ratio of the major diameter to the minor diameter is in the range of 1-1.5.

Embodiment 3

[0070] Follow the same conditions as in Example 1 above to the mixing step, extrude the resulting mixture into strips with a granulator, and cut to obtain granular extruded products with a diameter of 0.8 mm and a length of 1-3 mm. This extruded product was treated under the same conditions as in Example 1 to obtain spherical activated carbon with an average particle diameter of 1.1 mm. The MS hardness of the obtained spherical activated carbon was 54.6%, and the benzene adsorption capacity was 41.6%. x=1.1, so 100×(1-0.8×1.45 (0.3-x) )=40.6, the MS hardness of the spherical activated carbon is higher than this value. In addition, the filling specific gravity of the spherical activated carbon is 0.56 g / ml, and the ratio of the major axis to the minor axis is in the range of 1-1.5.

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Abstract

The invention provides an active carbon produced from an infusible carbonaceous material as a raw material, which active carbon when used for prevention of automobile fuel evaporation, etc., would not cause any trouble attributed to dust generation, exhibiting reduced pressure loss; and a process for producing the same. There is provided a spherical active carbon produced from an infusible solid carbon material as a raw material, wherein providing that x represents an average particle diameter (mm) and y an MS hardness (%), when x is in the range of 0.5 to 20, y is >= 100x(1-0.8x1.45<(0.3-x)>). This spherical active carbon can be produced by a process comprising mixing a carbon material with a carbonizable binder; extruding the mixture into a strand form; carrying out rolling granulation so as to obtain a spherical form; rendering the same infusible under appropriate conditions corresponding to the particle size; and performing carbonization and thereafter activation under conditions appropriately restricting the contact with activation gas.

Description

technical field [0001] The present invention relates to spherical activated carbon. More specifically, the present invention relates to a spherical activated carbon with high hardness using non-melting solid carbon material as raw material. Background technique [0002] Activated carbon has an excellent ability to adsorb various harmful substances and odorous substances, and has been used as an adsorbent in many fields, whether in households or industries. The activated carbon is used in various forms according to its use, such as powdery and granular shaped bodies. [0003] In recent years, the use of activated carbon has become more and more widespread, so the performance required for activated carbon has become more stringent depending on the use. For example, it has been developed in the application of filters for removing fuel vapor in automobiles, etc., but when activated carbon filters are used in automobiles, the filters are subject to long-term vibration and are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/14B01J20/20B01J20/28C01B32/336C01B32/384
CPCC01B31/14B01J20/20B01J20/28019C01B31/10C01B32/336C01B32/384
Inventor 中原文夫木崎玄夫三宅彰
Owner KURARAY CO LTD
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