CN1202004C - Process for preparing active carbon - Google Patents
Process for preparing active carbon Download PDFInfo
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- CN1202004C CN1202004C CNB021460043A CN02146004A CN1202004C CN 1202004 C CN1202004 C CN 1202004C CN B021460043 A CNB021460043 A CN B021460043A CN 02146004 A CN02146004 A CN 02146004A CN 1202004 C CN1202004 C CN 1202004C
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- active carbon
- gas
- preparation process
- reducing gas
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Abstract
The present invention discloses a method for producing active carbon. The method can be used for producing active carbon to enhance the yield of the active carbon, and the intensity of the active carbon, gas separation performance and adsorbability can be enhanced. The method comprises the technical scheme that a material containing carbon is carbonized and activated to obtain active carbon, and an activating agent used in an activation process comprises oxidizing gas and reducing gas. Due to the fact that the activation process is carried out under an oxidation-reduction condition, the surface performance of the active carbon is changed, and thus, the adsorbing performance and physical performance of the active carbon are improved. The adsorbability and desulphurizing ability of the active carbon are enahnced by 10 to 30%, the pore size distribution uniformity of a product is enhanced, the gas separation ability is enhanced, and the yield of the product is enhanced by 2 to 15%. The method can be used for producing high-quality active carbon in various purposes.
Description
Technical field
The present invention relates to a kind of preparation process of active carbon.
Background technology
At present the production process of active carbon mainly is divided into two kinds of physical activation method and chemical activation methods.Chemical activation method is to use ZnCl
2, chemical agent such as KOH makees activator, the activation carbon containing matter prepares gac under 500-800 ℃, condition of normal pressure.Because this method environmental pollution is serious, seldom adopt in recent years.Physical activation method is contenting carbon material charing under condition of normal pressure, uses oxidizing gas such as water vapor, CO then
2, oxygen or several oxidizing gas gas mixture make activator, under 700-1000 ℃ of hot conditions with carbon generation oxidizing reaction, the preparation gac, its technological process of production as shown in Figure 1.
Summary of the invention
The purpose of this invention is to provide a kind of preparation process of active carbon, utilize this method to prepare gac, can improve the gac yield, strengthen gac intensity, gas separating property and absorption property.
For achieving the above object, the present invention by the following technical solutions: a kind of preparation process of active carbon is that contenting carbon material is obtained gac through charing and after activating, and the activator in the described reactivation process is made up of oxidation and reducing gas; Described oxidizing gas is a water vapour, and described reducing gas is selected from one or more in ammonia, hydrogen, ethene and the acetylene.
The volume parts ratio that described oxidizing gas and reducing gas account for activator is respectively 99%-60% and 1%-40%.
Redox processes both can be that oxidation and reducing gas are carried out after mixing simultaneously, also can carry out separately respectively, reduced promptly earlier with oxidizing gas oxidation pore-creating, and then with reducing gas, changed the surface properties of gac.No matter oxidation, reduction are carried out simultaneously, still separately carry out, and all can improve the gac yield, improve the characteristics such as intensity, gas separating property and absorption property of gac.
The temperature of described reactivation process is 650-1000 ℃.
Described reactivation process can be carried out under normal pressure, also can carry out under the condition of pressurization, if carry out under pressurized conditions, institute's plus-pressure is 0.3-5MPa.
Pressurization preparation activated carbon process condition is as shown in table 1.
Table 1, pressurization preparation activated carbon process condition
| Condition of carbonization | The activating process condition |
| Charing is 2-8 ℃ of carbonization yield 72%-88% of 500 ℃ of-650 ℃ of charing heat-up rates of temperature pressure eventually | Hydrogen or ammonia level 5% activation yield 30%-50% pressure in the activation temperature 700-950 ℃ of activator |
Method of the present invention is suitable for utilizing various contenting carbon materials to make gac, for example can be in bituminous coal, hard coal, brown coal, timber and the shell one or more.
The present invention is owing to adopted above-mentioned technology, make the carbon activation generate gac by oxidizing gas and carbon generation oxidizing reaction in the activator, simultaneously owing to contain reducing gas in the activator, generate the novel functional group of hydrogeneous or nitrogen with the oxidisability active site generation reduction reaction on surface in the carbon, these functional groups are to improving the absorption property of gac, especially to polar gas such as H
2S, SO
2, formaldehyde etc. absorption property, bringing into play important effect.
Because reactivation process is carried out under the redox condition, changed the surface properties of gac, thereby charcoal absorption performance and physicals have been improved, activated carbon adsorptive capacity that obtains with method of the present invention and sweetening power obtain gac than ordinary method and have all improved 10%-30%, product even aperture distribution degree improves, the gas delivery ability strengthens, and product yield has improved 2%-15%.
Utilize method of the present invention can production flue gas desulfurization gac (Jiao), gas purification with desulphurized aetivated carbon, gas sweetening and isolating active charcoal, water treatment with gac, solvent recuperation with gac, automobile with gac and gas delivery gac with various kinds such as gacs.The main absorption property of gac and the physicals of preparation are as shown in table 2, and the activated carbon product with this performance is a kind of top-grade active carbon product that the conventional physical activation method is difficult to obtain.
Table 2, utilize the performance of the gac of oxidation-reduction quality mixed gas activation preparation
The title index
Tetrachloro charcoal adsorptive value % 80-110
Yamamoto Methylene Blue ZF % 220-300
Iodine number mg/g 650-1000
SO
2Loading capacity mg/g＞90
Specific surface m
2/ g 1000-1600
Bulk density g/L 450-650
Intensity %＞98
Description of drawings
Fig. 1 produces the process flow sheet of gac for the conventional physical activation method.
Embodiment
Embodiment 1:
Choose bituminous coal and be crushed to 2-6mm, at first carry out charing, warm 650 ℃ eventually of charings with ordinary method; Activation then, 800 ℃ of activation temperatures, pressure is 3MPa, activator is the gas mixture of water vapor and ammonia, ethene, the ammonia of equal volume and ethylene gas account for 20% in gas mixture, aeration time is 10 hours, obtains activated carbon product, the activation yield is about 40%, and the activated carbon product performance of preparation is as follows:
Iodine number mg/g 800-1100
Yamamoto Methylene Blue ZF mg/g 160-260
Tetrachloro charcoal % 40%-100%
SO
2Loading capacity mg/g＞100
Oxygen nitrogen separation factor 12-16
Specific surface m
2/ g 800-1000
Bulk density g/L 400-500
Intensity % 90-98%
Embodiment 2:
Choose the broken abrasive dust of brown coal, it is molded to add the tar stirring extruding, warm 650 ℃ eventually of charings then, charing; Charing is postactivated, 800 ℃ of activation temperatures, under normal pressure, carry out, the gas mixture of activated media water vapor and hydrogen, ammonia, the volume parts ratio of hydrogen and ammonia is 1: 3, they account for 20% of gas mixture, the ratio of water vapor and charcoal is 12: 1, and aeration time is 50 hours, obtains activated carbon product, activation yield 50%, the activated carbon product performance of preparation is as follows:
Iodine number mg/g 750-1000
Yamamoto Methylene Blue ZF mg/g 240-230
Tetrachloro charcoal % 40%-60%
H2S adsorptive capacity % 40%
Oxygen nitrogen separation factor 14-24
Specific surface m
2/ g 600-1000
Bulk density g/L 400-500
Intensity % 92-98%
Embodiment 3:
Choose coconut husk, be crushed to 4-20mm, warm 550 ℃ eventually of ordinary method charings, charing; Charing is postactivated, 800 ℃ of activation temperatures, under normal pressure, carry out, activated media is the gas mixture of water vapor and acetylene, ammonia, and the gas mixture of equal-volume acetylene, ammonia is 1: 9 with the volume parts of water vapor ratio, and the ratio of water vapor and charcoal is 10: 1, aeration time is 70 hours, obtain activated carbon product, activation yield 45%, the activated carbon product performance of preparation is as follows:
Iodine number mg/g 850-1000
Yamamoto Methylene Blue ZF mg/g 160-200
Tetrachloro charcoal % 40%-80%
Oxygen nitrogen separation factor 16-25
Specific surface m
2/ g 700-1000
Bulk density g/L 440-600
Intensity % 94-99%
Claims (7)
1, a kind of preparation process of active carbon is that contenting carbon material is obtained gac through charing and after activating, and it is characterized in that: the activator in the described reactivation process is made up of oxidation and reducing gas; Described oxidizing gas is a water vapour, and described reducing gas is selected from one or more in ammonia, hydrogen, ethene and the acetylene.
2, preparation process of active carbon according to claim 1 is characterized in that: the volume parts ratio that described oxidizing gas and reducing gas account for activator is respectively 99%-60% and 1%-40%.
3, preparation process of active carbon according to claim 1 and 2 is characterized in that: described oxidation and reducing gas act on after mixing simultaneously.
4, preparation process of active carbon according to claim 1 and 2 is characterized in that: described reactivation process is to feed oxidizing gas earlier, feeds reducing gas again.
5, preparation process of active carbon according to claim 1 and 2 is characterized in that: the temperature of described reactivation process is 650-1000 ℃.
6, preparation process of active carbon according to claim 1 and 2 is characterized in that: described reactivation process is to carry out under the condition of pressurization, and institute's plus-pressure is 0.3-5MPa.
7, preparation process of active carbon according to claim 1 and 2 is characterized in that: described contenting carbon material is one or more in bituminous coal, hard coal, brown coal, timber and the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021460043A CN1202004C (en) | 2002-10-23 | 2002-10-23 | Process for preparing active carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021460043A CN1202004C (en) | 2002-10-23 | 2002-10-23 | Process for preparing active carbon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1491886A CN1491886A (en) | 2004-04-28 |
| CN1202004C true CN1202004C (en) | 2005-05-18 |
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ID=34232585
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021460043A Expired - Fee Related CN1202004C (en) | 2002-10-23 | 2002-10-23 | Process for preparing active carbon |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304285C (en) * | 2004-05-26 | 2007-03-14 | 王浦林 | Process for preparing polyporous charcoal and device therefor |
| CN101993067A (en) * | 2010-10-19 | 2011-03-30 | 煤炭科学研究总院 | Sulfur, nitreand mercury removing active carbon and preparation method thereof |
| KR101896319B1 (en) * | 2016-02-25 | 2018-10-04 | 현대자동차 주식회사 | Activated carbon and method for manufacturing the same |
| CN105788876B (en) * | 2016-03-09 | 2018-02-09 | 湘潭大学 | A kind of preparation method for the technique and electrode of super capacitor for preparing biomass porous nitrogen-doped carbon material |
| KR102506938B1 (en) * | 2018-02-02 | 2023-03-07 | 현대자동차 주식회사 | Method for manufacturing activated carbon |
| CN109678154A (en) * | 2019-01-09 | 2019-04-26 | 新奥石墨烯技术有限公司 | Nitrogen-doped porous carbon material and preparation method thereof, cathode, battery and supercapacitor |
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2002
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| CN1491886A (en) | 2004-04-28 |
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