CN1204046C - High density high specific surface active carbon preparing method - Google Patents
High density high specific surface active carbon preparing method Download PDFInfo
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- CN1204046C CN1204046C CN 03138067 CN03138067A CN1204046C CN 1204046 C CN1204046 C CN 1204046C CN 03138067 CN03138067 CN 03138067 CN 03138067 A CN03138067 A CN 03138067A CN 1204046 C CN1204046 C CN 1204046C
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- active carbon
- specific surface
- surface area
- high specific
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Abstract
The present invention relates to a preparation method of active carbon with high density and large specific surface area. A water-soluble modified starch binding agent is added to active carbon with large specific surface area, and a puddle-shaped mixture is prepared; the puddle-shaped mixture is formed by extrusion and is dried and solidified at 160 to 220 DEG C, and the active carbon with high density and large specific surface area can be obtained. The preparation method has the advantages of simple operation technology, low cost and no pollution.
Description
Technical field:
The invention belongs to a kind of preparation method of active carbon, relate in particular to a kind of preparation method of high-density active carbon with high specific surface area.
Background technology:
As a kind of cellular solid, active carbon with high specific surface area has many important use in fields such as absorption, separation, catalysis and energy storage, in chemical industry, can be used as organic solvent absorption and the sorbing material that reclaims, catalyzer that in catalysis industry, can be used as or support of the catalyst as active carbon with high specific surface area.In addition, the electrode materials that also can be used for natural gas-storing and hydrogen and battery in the novel energy field.Yet because preparation technology's restriction, active carbon with high specific surface area is the very light powder of proportion normally, lower (the about 0.1g/cm of its tamped density
3), be difficult to directly in above-mentioned field, use.Therefore, how moulding is to solve one of this material key technologies for application with the density that improves forming composition.
One of effective ways that improve active carbon with high specific surface area density are to adopt organic resin or resin glue to mix with it, behind certain pressure condition compacted under, handle through carbonization-activation and can obtain high-density active carbon with high specific surface area forming composition.Announced a kind of preparation method of active carbon with high specific surface area as Chinese patent (application number 98126462), it is characterized in that active carbon with high specific surface area and binding agent with 1: the mixed of 0.30-0.60, compression moulding under 20-130 ℃, 50-320MPa pressure, in 700-1000 ℃ of charing, utilize water vapour or carbonic acid gas 700-1000 ℃ of following activation treatment again, make the moulding active carbon with high specific surface area.Chinese patent (application number 00104267) has also been announced a kind of preparation method who does not need the secondary carbonization-activation, it is characterized in that caking agent is dissolved in and be made into pasty liquid in the solvent, is the powdered carbon that makes and binding agent that 1: 0.07～1: 0.25 ratio adds in the pasty liquid and mixes by weight, compression moulding under 70-200MPa pressure obtains block charcoal; (3) the block charcoal of compression moulding temperature rise rate with 0.5～5.0 ℃/min under protection of inert gas rises to 200 ℃, and constant temperature was heat-treated and made active carbon with high specific surface area in 0.5～1 hour.In these two kinds of methods, the former needs re-activation to handle, and latter's atmosphere that needs protection,
Summary of the invention:
The object of the invention provides the simple high-density active carbon with high specific surface area of a kind of preparation method preparation method.
Preparation method of the present invention comprises the steps:
1, in the active carbon with high specific surface area powder, add a kind of water-soluble modified Starch Adhesive, the usage quantity of tackiness agent is 20-60wt%, in the ground and mixed process, adds the humidity that mixture is regulated in entry, makes clay shape mixture;
2, clay shape mixture is put into the screw extrusion sett frame, being squeezed into diameter is the strip charcoal of 1-4mm;
3, the strip charcoal after the moulding is heated to 160～220 ℃ with 2-20 ℃ of/minute intensification speed and carries out drying and solidification treatment, and under this temperature, keep 0.5～2 hour, make tackiness agent fully react curing, can obtain the high-density active carbon with high specific surface area.
Aforesaid active carbon with high specific surface area powder is that specific surface is 2000-3000m
2The active carbon powder of/g.
Aforesaid tackiness agent is the Starch Adhesive of a kind of water-soluble acrylic and gelatin modification, and the content of solids is 40-60%.
Feature of the present invention is that employing is a kind of cheap and easy to get, and the water-soluble modified amylan of environmentally safe is as tackiness agent, directly tackiness agent is joined in the active carbon with high specific surface area powder, add suitable quantity of water again and regulate the humidity of mixture, fully stir, make to form clay shape thing, make bar by extrusion molding again, in air, be heated to 160-220 ℃ then and handled 0.5-2 hour, obtain the high-density strip active carbon with high specific surface area of different size.This product has excellent mechanical intensity and water resistance, and absorption property (as the absorption property to organic solvent-benzene) is close with former powder, but the more former powder of density improves 3～8 times.Because this preparation technology do not need the gac after the moulding is carried out secondary charing and activation treatment, thereby has advantage such as the low and environmentally safe of energy consumption.In addition, in preparation process, do not need the protection of inert atmosphere, thereby the technology that can simplify the operation, unit output improved.In a word, this technology has advantages such as operating procedure is simple, with low cost and pollution-free, has good social benefit and economic benefit.
The density range of aforesaid high-density active carbon with high specific surface area is 0.4～0.8g/cm
3The scope of benzene adsorptive capacity is 0.8～1.3g/g.
Obtained active carbon with high specific surface area forming composition has higher density and intensity, therefore can be used for fields such as solvent recuperation, fractionation by adsorption, catalyzed reaction and energy storage.In addition, the profile of the active carbon with high specific surface area of the present invention's preparation can be according to using needs to adjust, as the bar and the block of different size.
Embodiment:
Embodiment 1
Behind 5 ml waters dilution, 3 gram treated starch tackiness agents, join in the 10 gram active carbon with high specific surface area powder (refinery coke base), form clay shape thing with the abundant ground and mixed of mortar, put it into again and be squeezed into the bar that diameter is 4mm in the spiral extrusion device, forming composition is put in the muffle furnace, be heated to 180 ℃ with 2 ℃/minute temperature rise rates, and after keeping 1.5 hours, can obtain diameter is the strip active carbon with high specific surface area of 4mm.The density of sample is 0.4g/cm
3, at ambient temperature, the weight percentage of absorption benzene is 120% (40 hours), the weight percentage of the absorption benzene of corresponding active carbon with high specific surface area powder is 125%.
Embodiment 2
Claim 5 gram treated starch tackiness agents and 5 gram active carbon with high specific surface area powder (refinery coke base), tackiness agent is directly joined in the active carbon with high specific surface area powder, after mortar grinds thorough mixing, form clay shape thing.Clay shape thing is put in the spiral extrusion device, extruding formation diameter is 2 millimeters a strip again.This strip charcoal is put in the muffle furnace, is heated to 200 ℃, be incubated after 1 hour, can obtain the strip active carbon with high specific surface area that diameter is about 2 millimeters after the taking-up with 5 ℃ of/minute intensification speed.The density of this sample is 0.7g/cm
3, under the room temperature condition, the weight percentage of absorption benzene is 80% (40 hours), the weight percentage of the absorption benzene of corresponding active carbon with high specific surface area powder is 125%.
Embodiment 3
Claim 4 gram treated starch tackiness agents and 10 gram active carbon with high specific surface area powder (refinery coke base), behind 5 ml waters dilution tackiness agent, join in the active carbon with high specific surface area powder, with mortar fully grind form clay shape thing after, be extruded into the bar that diameter is 1mm in screw extrusion press, forming composition is put into muffle furnace, is heated to 220 ℃ with 2 ℃/minute temperature rise rates, be incubated after 0.5 hour, get final product to such an extent that diameter is the strip active carbon with high specific surface area of 1mm.The density of this sample is 0.6g/cm
3, at ambient temperature, the weight percentage of benzene absorption is 115% (40 hours), the weight percentage of the benzene absorption of corresponding active carbon with high specific surface area powder is 125%.
Embodiment 4
Claim 2 gram treated starch tackiness agents and 6 gram active carbon with high specific surface area powder (refinery coke base), behind 4 ml waters dilution tackiness agent, join in the active carbon powder, even with the abundant ground and mixed of mortar, form clay shape thing.The material of the clay shape that forms is put into spiral extrusion device, be squeezed into the bar that diameter is 2 millimeter, then it put into muffle furnace, be heated to 180 ℃ with 10 ℃/minute temperature rise rates, be incubated after 1 hour, can obtain the columnar activated carbon that diameter is 2 millimeter.The density of this sample is 0.6g/cm
3, under the room temperature condition, the weight percentage of benzene absorption is 130% (40 hours), the weight percentage of the benzene absorption of corresponding active carbon with high specific surface area powder is 140%.
Claims (2)
1. the preparation method of a high-density active carbon with high specific surface area is characterized in that comprising the steps:
(1), in the active carbon with high specific surface area powder, add a kind of water soluble starch tackiness agent that obtains after to starch conversion by vinylformic acid and gelatin, the solid contents of Starch Adhesive is 40-60%, the usage quantity of Starch Adhesive accounts for the 20-60wt% of active carbon powder and Starch Adhesive gross weight, in the ground and mixed process, add entry and regulate the humidity of mixture, make clay shape mixture;
(2), clay shape mixture is put into the screw extrusion sett frame, being squeezed into diameter is the strip charcoal of 1-4mm;
(3), the strip charcoal after the moulding is heated to 160～220 ℃ with 2-20 ℃ of/minute intensification speed and carries out drying and solidification treatment, and under this temperature, kept 0.5～2 hour, make Starch Adhesive and active carbon powder fully react curing, get final product to such an extent that density range is 0.4-0.8g/cm
3Gac.
2. a kind of preparation method of active carbon as claimed in claim 1 is characterized in that described active carbon with high specific surface area powder is that specific surface is 2000-3000m
2The active carbon powder of/g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 03138067 CN1204046C (en) | 2003-05-29 | 2003-05-29 | High density high specific surface active carbon preparing method |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN 03138067 CN1204046C (en) | 2003-05-29 | 2003-05-29 | High density high specific surface active carbon preparing method |
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| CN1454840A CN1454840A (en) | 2003-11-12 |
| CN1204046C true CN1204046C (en) | 2005-06-01 |
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| CN 03138067 Expired - Fee Related CN1204046C (en) | 2003-05-29 | 2003-05-29 | High density high specific surface active carbon preparing method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325154C (en) * | 2004-04-09 | 2007-07-11 | 李韬 | Production, re-activating method and products of active golden carbon |
| CN102942181B (en) * | 2012-12-04 | 2014-07-02 | 南京大学 | Preparation method of formed carbon-based material |
| CN104692377B (en) * | 2015-02-09 | 2016-08-17 | 江西能欣生物科技有限公司 | A kind of wooden column-shaped active carbon production technology |
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