CN1425607A - Process for preparing high adsorptive active carbon - Google Patents
Process for preparing high adsorptive active carbon Download PDFInfo
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- CN1425607A CN1425607A CN 02157271 CN02157271A CN1425607A CN 1425607 A CN1425607 A CN 1425607A CN 02157271 CN02157271 CN 02157271 CN 02157271 A CN02157271 A CN 02157271A CN 1425607 A CN1425607 A CN 1425607A
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- active carbon
- phosphoric acid
- hydrolysis lignin
- acid hydrolysis
- acid
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Abstract
The present invention provides a preparation process of high adsorption active carbon. Acid hydrolytic lignin is first mixed with 1.0-2.5 times pure phosphoric acid and soaking at 50-250 deg.C for 0.5 hr; then activated at 300-500 deg.c for 30 min; and finally boiled in water, washed to active carbon pH value of 5-6, dewatered and stoved. Owing to the pre-treatment with phosphoric acid of 20-85 %, concentration to the acid hydrolytic lignin, the active carbon product has high adsorption performance, caramel decoloring rate as high as 120% and methylthionine chloride adsorbing rate as high as 270 mg/g.
Description
One, technical field
The present invention relates to a kind of preparation method of active carbon, especially relate to a kind of high absorption property preparation method of active carbon.
Two, background technology
At present, be that raw material is produced gac and mostly adopted chemical activation method with the hydrolytic lignin, the activator that is adopted is ZnCl
2And H
2SO
4People such as Yan Shanghua adopt the two stage activation method, with the ZnCl of 50～60Be '
2Be activator, successively at 200 ℃ of following charing 20min and 600 ℃ of following activation 90min, the adsorptive value of prepared its methylene blue of gac of result is 153.75～156.45mg/g, and A method caramel percent of decolourization is greater than 100%.People such as Yang Runchang use the ZnCl of 64Be '
2Behind activation 55min under 560 ℃, the charcoal absorption index that makes is: methylene blue adsorptive value 180～196mg/g, iodine sorption value 1141～1071mg/g, but the employed ZnCl of this method
2, pollute to environment.People such as Zhang Yun's night are raw material with the hydrolytic lignin, adopt 95%H
2SO
4Soak, activate 45min down at 240 ℃, obtained the methylene blue adsorptive value at 165～225mg/g, A method caramel percent of decolourization reaches 80～95%.But the employed sulfuric acid of this kind method is the very strong material of corrodibility, and equipment corrosion is serious in the course of industrialization, and more difficult recovery is used.
Three, technology contents
It is little and help the high absorption property preparation method of active carbon that reduces production costs that technical problem the invention provides a kind of environmental pollution, and this method can also alleviate the corrosion to equipment.
A kind of high absorption property preparation method of active carbon of technical scheme, place the pure phosphoric acid and the ratio (weight ratio) of acid hydrolysis lignin to be (1.0～2.5) the acid hydrolysis lignin: 1 phosphoric acid stirs evenly the back and soaks more than 0.5 hour down in 50 ℃-250 ℃, then, down activate 30 minute or more at 300 ℃-500 ℃ the acid hydrolysis lignin, at last, use water boil, through wash be 5-6 to the pH value of gac after, dehydration, oven dry.
Beneficial effect (1) adopts the present invention, macromolecular structure in the xylogen can dissolve in the high temperature acid solution and become loose, phosphoric acid can be immersed in its polymer structure easily, thereby produce dehydration and be connected skeleton function, so the present invention adopts phosphoric acid, especially adopting concentration is after the phosphoric acid of 20%-85% carries out pre-treatment to the acid hydrolysis lignin, make that the absorption property of the gac that employing phosphoric acid method is produced is higher, its caramel percent of decolourization even more than 120%, methylene blue even more than 270mg/g.(2) the present invention adopts phosphoric acid to produce gac, and adopts sulfuric acid particularly to adopt the vitriol oil to prepare gac to compare, and is lighter to the corrosion of equipment, just can produce thus to help the advantage that reduces production costs.Particularly phosphoric acid can be realized recycling, therefore, not only helps further to reduce production costs, and can reduce environmental pollution.(3) the present invention be that activator production process of active carbon is compared with the zinc chloride, have the little advantage of environmental pollution.In sum, it is little that the present invention has an environmental pollution, light to the equipment corrosion degree, the advantage that helps production cost to reduce; Has the high advantage of absorption property by the prepared gac of the present invention.
Four, specific embodiments
1 one kinds of high absorption property preparation method of active carbon of embodiment, place the pure phosphoric acid and the ratio (weight ratio) of acid hydrolysis lignin to be (1.0～2.5) the acid hydrolysis lignin: 1 phosphoric acid stirs evenly the back and soaks more than 0.5 hour down in 50 ℃-250 ℃, then, down activate 30 minute or more at 300 ℃-500 ℃ the acid hydrolysis lignin, at last, use water boil, wash to the pH value of gac be 5-6, again through the dehydration, the oven dry.In the present embodiment, soak time is 0.5 hour-12 hours in phosphoric acid, and phosphoric acid concentration is 20%-85%.
2 one kinds of high absorption property preparation method of active carbon of embodiment, it is that 1: 1 concentration is that the phosphoric acid of 50%-85% stirs evenly the back and soaks more than 0.5 hour down in 50 ℃ that the acid hydrolysis lignin is placed the ratio (weight ratio) of pure phosphoric acid and acid hydrolysis lignin, then, the acid hydrolysis lignin is activated 0.5 hour down at 400 ℃, at last, use water boil, through washing after the pH value of gac is 5-6, dehydration, oven dry, abrasive dust can obtain the high absorbability powdered carbon.
3 one kinds of high absorption property preparation method of active carbon of embodiment, it is that 1.3: 1 phosphoric acid stirs evenly the back and soaks more than 3 hours down in 95 ℃ that the acid hydrolysis lignin is placed the ratio (weight ratio) of pure phosphoric acid and acid hydrolysis lignin, then, the acid hydrolysis lignin is activated 1 hour down at 450 ℃, at last, use water boil, through washing after the pH value of gac is 5-6, dehydration, oven dry, abrasive dust can obtain the high absorbability powdered carbon.
4 one kinds of high absorption property preparation method of active carbon of embodiment, it is that 1.8: 1 phosphoric acid stirs evenly the back and soaks more than 6 hours down in 130 ℃ that the acid hydrolysis lignin is placed the ratio (weight ratio) of pure phosphoric acid and acid hydrolysis lignin, then, the acid hydrolysis lignin is activated 4 hours down at 320 ℃, at last, use water boil, through washing after the pH value of gac is 5-6, dehydration, oven dry, abrasive dust can obtain the high absorbability powdered carbon.
5 one kinds of high absorption property preparation method of active carbon of embodiment, it is that 2.5: 1 phosphoric acid stirs evenly the back and soaks more than 10 hours down in 165 ℃ that the acid hydrolysis lignin is placed the ratio (weight ratio) of pure phosphoric acid and acid hydrolysis lignin, then, the acid hydrolysis lignin is activated 7 hours down at 490 ℃, at last, use water boil, through washing after the pH value of gac is 5-6, dehydration, oven dry, abrasive dust can obtain the high absorbability powdered carbon.
6 one kinds of high absorption property preparation method of active carbon of embodiment, it is that 2.2: 1 phosphoric acid stirs evenly the back and soaks more than 15 hours down in 200 ℃ that the acid hydrolysis lignin is placed the ratio (weight ratio) of pure phosphoric acid and acid hydrolysis lignin, then, the acid hydrolysis lignin is activated 15 hours down at 350 ℃, at last, use water boil, through washing after the pH value of gac is 5-6, dehydration, oven dry, abrasive dust can obtain the high absorption property powdered carbon.
Claims (4)
1, a kind of high absorption property preparation method of active carbon, it is characterized in that placing the pure phosphoric acid and the ratio (weight ratio) of acid hydrolysis lignin to be (1.0～2.5) the acid hydrolysis lignin: 1 phosphoric acid stirs evenly the back and soaks more than 0.5 hour down in 50 ℃-250 ℃, then, down activate 30 minute or more at 300 ℃-500 ℃ the acid hydrolysis lignin, at last, use water boil, through wash be 5-6 to the pH value of gac after, dehydration, oven dry.
2, high absorption property preparation method of active carbon according to claim 1 is characterized in that soak time is 0.5 hour-12 hours in phosphoric acid.
3, according to claim l or 2 described high absorption property preparation method of active carbon, the phosphoric acid concentration that it is characterized in that soaking the acid hydrolysis lignin is 20%-85%.
4, high absorption property preparation method of active carbon according to claim 3 is characterized in that the soak time at the acid hydrolysis lignin is 30 minutes～150 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021572712A CN1207190C (en) | 2002-12-27 | 2002-12-27 | Process for preparing high adsorptive active carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021572712A CN1207190C (en) | 2002-12-27 | 2002-12-27 | Process for preparing high adsorptive active carbon |
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| Publication Number | Publication Date |
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| CN1425607A true CN1425607A (en) | 2003-06-25 |
| CN1207190C CN1207190C (en) | 2005-06-22 |
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|---|---|---|---|
| CNB021572712A Expired - Fee Related CN1207190C (en) | 2002-12-27 | 2002-12-27 | Process for preparing high adsorptive active carbon |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391837C (en) * | 2006-01-24 | 2008-06-04 | 云南永德糖业集团有限责任公司 | High efficiency active carbon for sugar and its preparing method |
| CN102730681A (en) * | 2012-06-25 | 2012-10-17 | 西南交通大学 | Preparation method of high adsorptive activated carbon |
| CN103230775A (en) * | 2013-05-10 | 2013-08-07 | 刘立文 | Carbonized plant fiber sulfuric acid decolorizing agent and preparation method thereof |
| CN107899565A (en) * | 2017-10-11 | 2018-04-13 | 中国林业科学研究院林产化学工业研究所 | A kind of charcoal based solid alkali catalyst and preparation method thereof |
| CN111244477A (en) * | 2020-01-14 | 2020-06-05 | 北京理工大学 | Preparation and application of biomass carbon nanosphere cluster material |
| CN111747408A (en) * | 2020-07-06 | 2020-10-09 | 南京林业大学 | Processing technology for improving quality of activated carbon through sulfuric acid pretreatment |
| EA039799B1 (en) * | 2020-12-15 | 2022-03-15 | Учреждение Белорусского государственного университета "Научно-исследовательский институт физико-химических проблем" (НИИ ФХП БГУ) | Method for producing activated mesoporous carbon from lignin-containing raw materials |
-
2002
- 2002-12-27 CN CNB021572712A patent/CN1207190C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391837C (en) * | 2006-01-24 | 2008-06-04 | 云南永德糖业集团有限责任公司 | High efficiency active carbon for sugar and its preparing method |
| CN102730681A (en) * | 2012-06-25 | 2012-10-17 | 西南交通大学 | Preparation method of high adsorptive activated carbon |
| CN103230775A (en) * | 2013-05-10 | 2013-08-07 | 刘立文 | Carbonized plant fiber sulfuric acid decolorizing agent and preparation method thereof |
| CN103230775B (en) * | 2013-05-10 | 2015-09-09 | 刘立文 | A kind of carbonate plant fiber sulfuric acid decolorizer and preparation method thereof |
| CN107899565A (en) * | 2017-10-11 | 2018-04-13 | 中国林业科学研究院林产化学工业研究所 | A kind of charcoal based solid alkali catalyst and preparation method thereof |
| CN111244477A (en) * | 2020-01-14 | 2020-06-05 | 北京理工大学 | Preparation and application of biomass carbon nanosphere cluster material |
| CN111747408A (en) * | 2020-07-06 | 2020-10-09 | 南京林业大学 | Processing technology for improving quality of activated carbon through sulfuric acid pretreatment |
| EA039799B1 (en) * | 2020-12-15 | 2022-03-15 | Учреждение Белорусского государственного университета "Научно-исследовательский институт физико-химических проблем" (НИИ ФХП БГУ) | Method for producing activated mesoporous carbon from lignin-containing raw materials |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1207190C (en) | 2005-06-22 |
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