Method for preparing active carbon

A technology of activated carbon and charcoal, used in chemical instruments and methods, special forms of dry distillation, inorganic chemistry, etc., can solve problems such as complex processes, and achieve the effects of strong decolorization power, strong adsorption capacity, and large specific surface area.

Inactive Publication Date: 2008-01-09
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention patent with the publication number CN1128100C discloses a method of using bamboo as raw material to produce activated carbon. The disadvantage of this process is that the process is more complicated and requires pickling process.

Method used

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  • Method for preparing active carbon
  • Method for preparing active carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] As shown in Figures 1 and 2, the preparation of activated carbon by the method of the present invention adopts a wood carbonization device and an activation device to prepare,

[0029] Specific steps are as follows:

[0030] 1. Split the ginkgo wood into 25cm, 2cm wide, and 0.5cm thick wood chips for sufficient carbonization;

[0031] 2. Weigh 0.5 kg of ginkgo wood chips and put them into the retort 4 of the wood carbonization device, then put the retort 4 into the carbonization furnace 1, insert the thermocouples 2 and 3 connected to the power supply, as shown in Figure 1, through the thermoelectric Couples 2 and 3 respectively measure the temperature inside and outside the retort 4 so as to control the temperature of the retort 4 .

[0032] The carbonization furnace 1 is connected with a gas flow meter 7 and a liquid collection and metering device 6. Through the gas flow meter 7, the gas generated during the wood carbonization process can be seen. There is no gas gen...

Embodiment 2

[0040] Except that in step 4, when the activation temperature reaches 850° C., the water vapor supply is controlled to be 100 ml, and the activation time is controlled to be 40 min, the others are the same as in Example 1.

Embodiment 3

[0042] Except that the carbonization temperature in step 2 is controlled at 500°C, the water vapor supply in step 4 is 140ml, and the activation time is 40min, the rest is the same as that of Example 1.

[0043] Its quality index of the ginkgo activated carbon that embodiment one to three prepares is as table 1.

[0044] Table 1

[0045] Quality Index

Iodine adsorption value

(mg / g)

Methylene blue decolorization power

(ml / 0.1g)

Activation yield (%)

Embodiment one

Embodiment two

Embodiment three

1072.30

1084.30

1074.09

14

14

14

33.5

35.8

32.8

[0046] Among them, the determination method of methylene blue adsorption value adopts GB / T 12496.10-1999; the determination method of iodine adsorption value adopts GB / T 12496.8-1999; the activation yield is calculated by the following formula:

[0047] Activated carbon yield (%)=(activated charcoal amount / charcoal am...

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Abstract

This invention discloses a method for preparing activated carbon. It contains procedures of: A, preparation of raw material: cutting ginkgo tree wood into chips; B, Charring: dry distillation charring of said chips in a charring installation with heating temperature of 500-550deg.C, after that keeping the temperature for 40min. Then lowering the temperature to room temperature; C, breaking and sieving: the chips such charred are then broken, and then being sieved and classified into various sized granules; D, activating: said granules are then heated, under steam protective atmosphere (supply volume being 100-140ml) at temperature 800-850deg.C for 40-60min; E, aftertreatment: removing the dust and drying them, so obtaining the inventive product. The activated carbon has excellent porous structure, higher activity yield, greater specific surface area and strong decolorization. It can absorb benzene, formaldehyde, ammonia, trichloromethane and heavy metals such as lead and cadmium.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon from woody raw materials. Background technique [0002] Since the industrial production of activated carbon began in the early 20th century, as an adsorbent with excellent performance, it has been widely used in many fields of modern industries such as food, medicine, chemical industry, military industry and mining. In recent years, in order to prevent and control public hazards such as air pollution, water pollution and stench, activated carbon has also been more and more widely used in environmental protection. At present, activated carbon is being continuously developed as a molecular sieve, a catalyst carrier, and new applications in the precision electronics industry, and gratifying results have been achieved. It can be said that the activated carbon industry will continue to advance with the development of modern industry an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B31/08C10B53/02C01B32/336
CPCY02E50/14Y02E50/10
Inventor 曹福亮汪贵斌张往祥杨小虎
Owner NANJING FORESTRY UNIV
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