CN108069424A - A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area - Google Patents
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area Download PDFInfo
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- CN108069424A CN108069424A CN201810017320.6A CN201810017320A CN108069424A CN 108069424 A CN108069424 A CN 108069424A CN 201810017320 A CN201810017320 A CN 201810017320A CN 108069424 A CN108069424 A CN 108069424A
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Abstract
The invention discloses a kind of methods that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprise the following steps：1) the broken and charing of agricultural crop straw, obtains carbonized material；2) immersion of the carbonized material in sodium hydroxide solution；3) the first time activation of carbonized material；4) second of activation of carbonized material, washing, drying, screening.The present invention prepares activated carbon using agricultural wastes agricultural crop straw as raw material, obtained ash of active carbon content is low, large specific surface area, its preparation method is simple, it not only avoids agricultural crop straw and burns the wasting of resources brought and problem of environmental pollution in violation of rules and regulations, but also efficiently solve the problems, such as activated carbon shortage of raw materials.
Description
Technical field
The present invention relates to a kind of methods that agricultural crop straw prepares low ash content active carbon with high specific surface area, belong to activated carbon system
Standby technical field.
Background technology
China is a large agricultural country, agricultural and sideline product very abundant.According to statistics, agricultural crop straw total output in China's is more than 7
Hundred million tons, wherein 2.3 hundred million tons of straw class, 1.2 hundred million tons of wheat stalk, 2.2 hundred million tons of maize straw, 200,000,000 tons of other crops.However,
The utilization rate of China's agricultural crop straw is but very low, only accounts for 5% or so, otherwise remaining stalk is directly discarded or burns in violation of rules and regulations,
The wasting of resources is not only resulted in, but also problem of environmental pollution can be brought.
Activated carbon has flourishing pore structure, large specific surface area (1000~3000m2/ g), adsorption capacity is strong (to gas
Have very strong adsorption capacity with organic matter, inorganic matter, the colloidal solid in solution etc.), national defence, chemical industry, oil, weaving,
The fields such as sewage disposal, interior decoration are widely used.Wherein, wood activated charcoal is compared with other kinds of activated carbon, pure
It is more preferable to spend lower higher, ash content, specific surface area bigger, absorption property, advantage is very prominent, has a extensive future, but its raw material
Limited source.If agricultural crop straw can be fabricated to wood activated charcoal, then can not only economize on resources, but also can prepare
The activated carbon product that value is high, demand is big.At present, useful agricultural crop straw makes the technique of activated carbon, but prepares
Activated carbon in content of ashes be more than 20%, specific surface area but only have about 600m2/ g, can not meet actual use at all will
It asks.Therefore, it is necessary to develop a kind of method that low ash content, active carbon with high specific surface area are prepared by agricultural crop straw.
The content of the invention
It is an object of the invention to provide a kind of methods that agricultural crop straw prepares low ash content active carbon with high specific surface area.
The technical solution used in the present invention is：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) agricultural crop straw is broken into graininess, then is carbonized, obtain carbonized material；
2) carbonized material and sodium hydroxide are uniformly mixed, add water scattered, fully immersion, filtering；
3) solid product that step 2) is obtained by filtration is activated, then is washed；
4) solid product of step 3) is put into rotary furnace, is passed through vapor, activated, then washed, dry, sieve,
Obtain active carbon finished products.
The temperature of charing is 400~550 DEG C in step 1), and carbonization time is 1~3h.
Agricultural crop straw described in step 1) is at least one of maize straw, broomcorn straw, rice straw.
The grain size that agricultural crop straw is broken into particle after graininess in step 1) is 1~10mm.
The mass ratio of carbonized material, sodium hydroxide described in step 2) is 1：(0.12~0.20).
The time impregnated in step 2) is 5~10h.
The temperature of activation is 500~600 DEG C in step 3), and soak time is 0.5~2h.
The temperature of activation is 800~950 DEG C in step 4), and soak time is 6.5~8.5h.
The beneficial effects of the invention are as follows：The present invention prepares activated carbon using agricultural wastes agricultural crop straw as raw material, obtains
Ash of active carbon content low (≤5%), large specific surface area (>1000m2/ g), its preparation method is simple, not only avoids farming
Object stalk burns the wasting of resources brought and problem of environmental pollution in violation of rules and regulations, but also efficiently solves activated carbon shortage of raw materials and ask
Topic.
Specific embodiment
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) agricultural crop straw is broken into graininess, then is carbonized, obtain carbonized material；
2) carbonized material and sodium hydroxide are uniformly mixed, add water scattered, fully immersion, filtering；
3) solid product that step 2) is obtained by filtration is activated, then is washed；
4) solid product of step 3) is put into rotary furnace, is passed through vapor, activated, then washed, dry, sieve,
Obtain active carbon finished products.
Preferably, the temperature of charing is 400~550 DEG C in step 1), and carbonization time is 1~3h.
It is further preferred that the temperature of charing is 450~500 DEG C in step 1), carbonization time is 1.5~2.5h.
Preferably, the agricultural crop straw described in step 1) is at least one in maize straw, broomcorn straw, rice straw
Kind.
Preferably, the grain size that agricultural crop straw is broken into particle after graininess in step 1) is 1~10mm.
Preferably, the carbonized material described in step 2), the mass ratio of sodium hydroxide are 1：(0.12~0.20).
Preferably, the time impregnated in step 2) is 5~10h.
Preferably, the temperature of activation is 500~600 DEG C in step 3), and soak time is 0.5~2h.
It is further preferred that the temperature of activation is 530~580 DEG C in step 3), soak time is 0.5~1.5h.
Preferably, the temperature of activation is 800~950 DEG C in step 4), and soak time is 6.5~8.5h.
It is further preferred that the temperature of activation is 850~900 DEG C in step 4), soak time is 7~8h.
The present invention is made further explanation and description with reference to specific embodiment.
Embodiment 1：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) maize straw is broken into graininess, 480 DEG C of charing 2h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 12%) are uniformly mixed, add water scattered, immersion 7h, then
It is filtered；
3) solid product that step 2) is obtained by filtration is placed at 550 DEG C, is activated 1h, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 870 DEG C of activation 7.5h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Embodiment 2：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) maize straw and rice straw are broken into graininess, 470 DEG C of charing 2.5h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 12%) are uniformly mixed, add water scattered, immersion 7.5h,
It is filtered again；
3) solid product that step 2) is obtained by filtration is placed at 570 DEG C, is activated 50min, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 850 DEG C of activation 8h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Embodiment 3：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) broomcorn straw is broken into graininess, 470 DEG C of charing 3h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 15%) are uniformly mixed, add water scattered, immersion 7h, then
It is filtered；
3) solid product that step 2) is obtained by filtration is placed at 520 DEG C, is activated 80min, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 870 DEG C of activation 7.5h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Embodiment 4：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) maize straw, broomcorn straw and rice straw are broken into graininess, 500 DEG C of charing 1h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 20%) are uniformly mixed, add water scattered, immersion 7.5h,
It is filtered again；
3) solid product that step 2) is obtained by filtration is placed at 600 DEG C, is activated 1h, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 860 DEG C of activation 8h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Embodiment 5：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) maize straw, broomcorn straw and rice straw are broken into graininess, 500 DEG C of charing 2h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 18%) are uniformly mixed, add water scattered, immersion 7.5h,
It is filtered again；
3) solid product that step 2) is obtained by filtration is placed at 550 DEG C, is activated 1.5h, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 850 DEG C of activation 7.5h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Embodiment 6：
A kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, comprises the following steps：
1) maize straw, broomcorn straw and rice straw are broken into graininess, 500 DEG C of charing 1.5h obtain carbonized material；
2) carbonized material and sodium hydroxide (account for carbonized material quality 15%) are uniformly mixed, add water scattered, immersion 8h, then
It is filtered；
3) solid product that step 2) is obtained by filtration is placed at 550 DEG C, is activated 2h, then is washed；
4) solid product of step 3) is added in into rotary furnace, is passed through vapor, 900 DEG C of activation 8h, then is washed, dried
Dry, screening, obtains active carbon finished products.
Test case：
The performance test results of active carbon finished products prepared by Examples 1 to 6 are as shown in the table：
The performance test data of the active carbon finished products of 1 Examples 1 to 6 of table
As shown in Table 1：The present invention prepares activated carbon using agricultural wastes agricultural crop straw as raw material, obtained active charcoal ash
Point content low (≤5%), large specific surface area (>1000m2/g)。
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. a kind of method that agricultural crop straw prepares low ash content active carbon with high specific surface area, it is characterised in that：Comprise the following steps：
1) agricultural crop straw is broken into graininess, then is carbonized, obtain carbonized material；
2) carbonized material and sodium hydroxide are uniformly mixed, add water scattered, fully immersion, filtering；
3) solid product that step 2) is obtained by filtration is activated, then is washed；
4) solid product of step 3) is put into rotary furnace, is passed through vapor, activated, then washed, dry, sieve, obtained
Active carbon finished products.
2. the method that agricultural crop straw according to claim 1 prepares low ash content active carbon with high specific surface area, feature exist
In：
The temperature of charing is 400~550 DEG C in step 1), and carbonization time is 1~3h.
3. agricultural crop straw according to claim 1 or 2 prepares the method for low ash content active carbon with high specific surface area, feature
It is：Agricultural crop straw described in step 1) is at least one of maize straw, broomcorn straw, rice straw.
4. agricultural crop straw according to claim 1 or 2 prepares the method for low ash content active carbon with high specific surface area, feature
It is：The grain size that agricultural crop straw is broken into particle after graininess in step 1) is 1~10mm.
5. the method that agricultural crop straw according to claim 1 prepares low ash content active carbon with high specific surface area, feature exist
In：
The mass ratio of carbonized material, sodium hydroxide described in step 2) is 1：(0.12~0.20).
6. the method that agricultural crop straw prepares low ash content active carbon with high specific surface area according to claim 1 or 5, feature
It is：The time impregnated in step 2) is 5~10h.
7. the method that agricultural crop straw according to claim 1 prepares low ash content active carbon with high specific surface area, feature exist
In：
The temperature of activation is 500~600 DEG C in step 3), and soak time is 0.5~2h.
8. the method that agricultural crop straw according to claim 1 prepares low ash content active carbon with high specific surface area, feature exist
In：
The temperature of activation is 800~950 DEG C in step 4), and soak time is 6.5~8.5h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108928820A (en) * | 2018-09-30 | 2018-12-04 | 淮阴师范学院 | A kind of rice straw based super capacitor active carbon and preparation method thereof |
| CN109231202A (en) * | 2018-12-05 | 2019-01-18 | 重庆文理学院 | A kind of ginger straw base nanometer porous carbon and preparation method thereof |
| CN114538435A (en) * | 2022-03-14 | 2022-05-27 | 桂东县湘浙活性炭有限公司 | Preparation method of plant activated carbon for oil processing |
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| CN106145110A (en) * | 2016-07-05 | 2016-11-23 | 中国矿业大学 | A kind of activated carbon two step process for preparing activated and the application in ultracapacitor thereof |
| CN106904613A (en) * | 2015-12-23 | 2017-06-30 | 北京化工大学常州先进材料研究院 | A kind of preparation method and applications of activated carbon |
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Patent Citations (6)
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| CN102020274A (en) * | 2010-12-14 | 2011-04-20 | 卞奎友 | New process for producing straw active carbon once by utilizing physical activation method |
| CN102247802A (en) * | 2011-04-27 | 2011-11-23 | 中南大学 | Method for preparing activated carbon |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108928820A (en) * | 2018-09-30 | 2018-12-04 | 淮阴师范学院 | A kind of rice straw based super capacitor active carbon and preparation method thereof |
| CN109231202A (en) * | 2018-12-05 | 2019-01-18 | 重庆文理学院 | A kind of ginger straw base nanometer porous carbon and preparation method thereof |
| CN114538435A (en) * | 2022-03-14 | 2022-05-27 | 桂东县湘浙活性炭有限公司 | Preparation method of plant activated carbon for oil processing |
| CN114538435B (en) * | 2022-03-14 | 2023-09-19 | 桂东县湘浙活性炭有限公司 | Preparation method of plant active carbon for oil processing |
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Effective date of registration: 20191129 Address after: 364112 Xiayang Dongshan Industrial Park, Xiayang Town, Yongding District, Longyan City, Fujian Province Applicant after: Fujian Hanyan Environmental Protection Technology Co., Ltd Address before: 528300 five place of No. 6, Sha Kun Industrial Zone, Daliang five neighborhood committee, Shunde District, Foshan, Guangdong. Applicant before: Foshan Han Yan Activated Carbon Manufacturing Co., Ltd. |
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