CN103274405A - Control method of active carbon structure - Google Patents
Control method of active carbon structure Download PDFInfo
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- CN103274405A CN103274405A CN2013102587307A CN201310258730A CN103274405A CN 103274405 A CN103274405 A CN 103274405A CN 2013102587307 A CN2013102587307 A CN 2013102587307A CN 201310258730 A CN201310258730 A CN 201310258730A CN 103274405 A CN103274405 A CN 103274405A
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Abstract
The invention discloses a control method of an active carbon structure, in particular to a process for controlling rice hull active carbon pore structure by using high-temperature acid activation and water treatment at different temperatures. The control method comprises the particular steps of: mixing rice hulls and phosphoric acid at certain concentration for activation at a certain temperature, conducting water treatment on an activation product at different temperatures to be neutral, and recycling acid washing liquid. The control method is simple in process and convenient to operate, the pore structure, specific surface area and silica content of active carbon can be adjusted by the water treatment, the rice hulls serve as raw materials, so that the cost is saved, the environmental pollution is reduced, and the process is green and environment-friendly.
Description
Technical field
The present invention relates to a kind of control method of gac structure, be specifically related to the method for differing temps water processing control rice hull active carbon structure.
Background technology
Gac is a kind of important chemical product, has big specific surface area and flourishing pore texture, and it is widely used in fields such as the energy, electronics, food, medicine, catalyzer.The presoma of gac mainly is divided into two classes: the biomass of (1) carbon containing mainly comprise bamboo and wood, shell, fruit stone, wood machining residues etc.; (2) petrochemicals of carbon containing and some macromolecular materials mainly comprise coal, oil, pitch, refinery coke, carbon fiber, polyvinyl chloride, polypropylene, resol, furane resin etc.Pollute and the energy scarcity problem facing to serious environmental day by day, it is particularly important that the development and use of biomass resource seem.Many investigators are devoted to the research of this respect.It is raw material production environment-friendly type process of active carbon with the bamboo that patent CN 102259855 A disclose a kind of.It is the feedstock production process of active carbon with the finger citron residue that patent CN 101844764 A disclose a kind of.Patent CN 102020274 A disclose a kind of novel process of utilizing physical activation method once to produce straw-stem active charcoal.Patent CN 102020272 A disclose a kind of rice hull ash of utilizing and have produced water glass and process of active carbon.Because the biomass wide material sources are cheap, therefore, produce gac by biomass and have very big market potential.
Preparation method of active carbon mainly is divided into physical activation method and chemical activation method.Physical activation method needs high temperature, and is long-time, and power consumption is big.The gac specific surface area of chemical activation method preparation is big, the hole prosperity.Chemical activating agent mainly comprises: phosphoric acid, potassium hydroxide, sodium hydroxide, zinc chloride.Potassium hydroxide and sodium hydroxide are that the advantage of activator is that the specific surface area of gac is big, and shortcoming is that productive rate is low, needs a large amount of alkali, cost height and etching apparatus.The advantage of zinc chloride activation is that technology is simple, and the carbonization-activation temperature is low, and shortcoming is to pollute greatly.Phosphoric acid is that cost is low for the activator advantage, pollutes gently, and the productive rate height, phosphoric acid is recyclable, and shortcoming is that the ash content of gac is higher.Contrasting above several method, is that activator prepares gac with phosphoric acid, is fit to scale operation.
Rice husk is a kind of a large amount of agricultural wastes, also is a kind of reproducible biomass resource simultaneously.The main component of rice husk is carbon and silicon-dioxide.Rice husk contain the 70%-80% that carbon part accounts for the rice husk quality, mainly the form with xylogen, Mierocrystalline cellulose and hemicellulose exists.Silicon-dioxide accounts for 20% of rice husk quality.Be that raw material production gac and material have economic benefit hugely with the rice husk.Structure of activated carbon influences the Application of Brand Active Carbon performance, and the structure of controlling gac by effective means has a great deal of practical meanings.Utilize in the gac of rice husk production and often contain silicon-dioxide, can exert an influence to structure of activated carbon character.
The present invention is raw material with the rice husk, in conjunction with phosphoric acid activation method and water treating method, and the control structure of activated carbon, this kind technology yet there are no report.
Summary of the invention
The purpose of this invention is to provide a kind of method of controlling the rice hull active carbon structure, this method has realized the control of structure of activated carbon and silicon content by the change of simple water treatment condition.
The technology used in the present invention technology may further comprise the steps:
(1) is that the phosphoric acid of 50%-85% mixes with the mass ratio of 1:1-1:6 with rice husk and massfraction, with the heat-up rate of 20 ℃/min, is warming up to 300-600 ℃, keep 0.5-2 h, be cooled to room temperature naturally.
(2) 20-100 ℃ the water treatment 0.5-3 h of rice husk that high-temperature acid in the step (1) was handled, the gac of acquisition Different Pore Structures.
The invention is characterized in: described water treatment method can be controlled silicon content, hole and the specific surface area of gac.
Embodiment
Embodiment 1:Rice husk is mixed by mass ratio 1:5 with 50% phosphoric acid, place retort furnace, with the heat-up rate of 20 ℃/min, be warming up to 500 ℃, activate 0.5 h, be cooled to room temperature naturally.The product that obtains is extremely neutral with 20 ℃ of water filtrations, washing.Obtaining pore volume is 0.61 ml/g, and specific surface area is 634 m
2/ g, dioxide-containing silica are 32.2% gac.
Embodiment 2:The temperature that changes water is 40 ℃, and all the other conditions are as described in the embodiment 1.Obtaining pore volume is 0.93 ml/g, and specific surface area is 847 m
2/ g, dioxide-containing silica are 21.9% gac.
Embodiment 3:The temperature that changes water is 60 ℃, and all the other condition embodiment 1 are described.Obtaining pore volume is 1.34 ml/g, and specific surface area is 1213 m
2/ g, dioxide-containing silica are 14.1% gac.
Embodiment 4:The temperature that changes water is 80 ℃, and all the other condition embodiment 1 are described.Obtaining pore volume is 1.93 ml/g, and specific surface area is 1795 m
2/ g, dioxide-containing silica are 8.9% gac.
Embodiment 5:The temperature that changes water is 100 ℃, and all the other condition embodiment 1 are described.Obtaining pore volume is 2.03 ml/g, and specific surface area is 1821 m
2/ g, dioxide-containing silica are 8.3% gac.
Claims (3)
1. the control method of a gac structure, its concrete steps are as follows:
(1) be that the phosphoric acid of 50%-85% mixes with the mass ratio of 1:2-1:6 with rice husk and massfraction, with mixture high-temperature activation 0.5-3 h in retort furnace;
(2) the thermal treatment product of step (1) is handled with 20-100 ℃ of deionized water, obtained gac;
(3) the described water lotion of step (2) is reclaimed.
2. the control method of a gac structure as claimed in claim 1, it is characterized in that: the raw material of described production gac is rice husk.
3. the control method of a gac structure as claimed in claim 1, it is characterized in that: described water treatment procedure, water temp are 20-100 ℃.
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| CN2013102587307A CN103274405A (en) | 2013-06-26 | 2013-06-26 | Control method of active carbon structure |
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| CN2013102587307A CN103274405A (en) | 2013-06-26 | 2013-06-26 | Control method of active carbon structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464104A (en) * | 2013-10-08 | 2013-12-25 | 滁州华伦装饰材料有限公司 | Active carbon and preparing method thereof |
| CN103708453A (en) * | 2013-12-11 | 2014-04-09 | 吉林大学 | Method for co-production of activated carbon and silicon compound fertilizer by using rice hulls |
| CN104211045A (en) * | 2014-09-04 | 2014-12-17 | 江南大学 | Method for easily and fast preparing rice hull-based porous carbon/silicon dioxide composite material |
Citations (3)
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| JP2005001955A (en) * | 2003-06-13 | 2005-01-06 | Asahi Kasei Chemicals Corp | Manufacturing method of high purity caustic soda aqueous solution and activation method of active carbon therefor |
| JP2005060877A (en) * | 2003-08-11 | 2005-03-10 | Japan Science & Technology Agency | Method for producing mesoporous activated carbon fiber |
| CN101955183A (en) * | 2010-10-20 | 2011-01-26 | 中南民族大学 | Method for preparing wheat bran-based high-quality active carbon |
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2013
- 2013-06-26 CN CN2013102587307A patent/CN103274405A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005001955A (en) * | 2003-06-13 | 2005-01-06 | Asahi Kasei Chemicals Corp | Manufacturing method of high purity caustic soda aqueous solution and activation method of active carbon therefor |
| JP2005060877A (en) * | 2003-08-11 | 2005-03-10 | Japan Science & Technology Agency | Method for producing mesoporous activated carbon fiber |
| CN101955183A (en) * | 2010-10-20 | 2011-01-26 | 中南民族大学 | Method for preparing wheat bran-based high-quality active carbon |
Non-Patent Citations (2)
| Title |
|---|
| 胡志杰 等: "磷酸活化法制备稻壳活性炭的研究", 《林业科技开发》, vol. 21, no. 4, 31 August 2007 (2007-08-31), pages 83 - 85 * |
| 陈悦: "稻壳基多孔炭应用开发研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 9, 15 September 2011 (2011-09-15), pages 016 - 132 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464104A (en) * | 2013-10-08 | 2013-12-25 | 滁州华伦装饰材料有限公司 | Active carbon and preparing method thereof |
| CN103708453A (en) * | 2013-12-11 | 2014-04-09 | 吉林大学 | Method for co-production of activated carbon and silicon compound fertilizer by using rice hulls |
| CN103708453B (en) * | 2013-12-11 | 2015-11-25 | 吉林大学 | A kind of method of rice husk co-producing active carbon and silicon composite fertilizer |
| CN104211045A (en) * | 2014-09-04 | 2014-12-17 | 江南大学 | Method for easily and fast preparing rice hull-based porous carbon/silicon dioxide composite material |
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Application publication date: 20130904 |