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Method for preparing activated carbon with high specific surface area through rapid activation under fluidization

一种高比表面积、活性炭的技术，应用在化学仪器和方法、碳化合物、无机化学等方向，能够解决活化时间长、物料加热速率缓慢等问题，达到活化时间短、增加处理量、比表面积高的效果

Active Publication Date: 2016-10-12
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the activation time is too long, the material heating rate is slow, and the operation cycle is basically 0.5-2 hours, or even longer

Method used

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  • Method for preparing activated carbon with high specific surface area through rapid activation under fluidization
  • Method for preparing activated carbon with high specific surface area through rapid activation under fluidization
  • Method for preparing activated carbon with high specific surface area through rapid activation under fluidization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix and soak 85% phosphoric acid and pine sawdust, the material particle size is 0.56-0.9mm, the mass ratio of phosphoric acid and material is 1:1, 2:1, 3:1, soak at room temperature for 3 hours, and then put it in a constant temperature oven at 105°C Dry within 10h, then stir into granules. Activated in a spouted bed reactor, the activation temperature is 800°C, when the spouted bed reactor is heated up to 800°C, the fluidization gas nitrogen is introduced, and the immersion ratio (H 3 PO 4 / pine sawdust) is 1:1, 2:1, 3:1, the fluidizing gas volume of the fluidizing gas is 0.7m 3 / h, 1.5m 3 / h, 1.9m 3 / h, put 10g of granular material into the spouted bed reactor, and put 20g of quartz sand into it. Activation for 1-10min, after the activation, wash in warm water at 80°C until the pH is neutral. The following table is the quality parameters of activated carbon obtained by rapid activation of pine sawdust under fluidization. It can be concluded that the specific su...

Embodiment 2

[0036] Mix and soak 85% phosphoric acid and material walnut shells, the material particle size is 0.4-0.8mm, the mass ratio of phosphoric acid and material is 1.5:1 and 2:1, soak at room temperature for 3 hours, and then dry in a constant temperature oven at 105°C for 10 hours. Then stir until granulated. Activated in a spouted bed reactor, the activation temperature is 800°C, when the spouted bed reactor is heated up to 800°C, the fluidization gas nitrogen is introduced, and the immersion ratio (H 3 PO 4 / walnut shell) is 1.5:1, when 2:1, the fluidization gas volume of fluidization gas is 1.5m 3 / h, put 25g of quartz sand, put 10g of material into the spouted bed reactor, activate for 5min, wash in warm water at 80°C until the pH is neutral after activation.

[0037] The following table shows the quality of activated carbon prepared from walnut shells. It can also be concluded that under the phosphoric acid chemical activation method, high specific surface area activated ca...

Embodiment 3

[0040] Mix and soak 85% phosphoric acid and wheat straw, the material particle size is 0.56-0.9mm, the soaking mass ratio of phosphoric acid and wheat straw is 1:1 and 2:1, soak for 3 hours at room temperature, and then dry in a constant temperature oven at 105°C After 10 hours, it was stirred into particles and activated in a spouted bed reactor at an activation temperature of 800°C. First heat the spouted bed reactor to 800°C, then feed fluidizing gas nitrogen or carbon dioxide, soaking ratio (H 3 PO 4 / wheat straw) is 1:1, 2:1, the fluidization gas volume of fluidization gas is 0.7m 3 / h, 1.5m 3 / h, put 30g of quartz sand, put 10g of material into the spouted bed reactor, activate for 5min, quickly pour out the material after activation, and wash in warm water at 80°C until the pH is neutral.

[0041] The following table is the quality parameters of the obtained activated carbon. It can be seen that even if the activation time is only 5 minutes, the specific surface ar...

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Abstract

The invention relates to a method for preparing activated carbon with the high specific surface area through rapid activation under fluidization. The method is characterized by comprising steps as follows: 1) a biomass raw material with the particle size ranging from 0.3 mm to 0.9 mm is selected, soaked in a chemical reagent for 3-6 h and dried in a constant-temperature drying box at the temperature of 100-150 DEG C after soaking; 2) after drying, the dried material is stirred or crushed to form particulate materials; 3) a fluidized bed or a spouted bed is used as an activation reactor, the activation reactor is heated to 700-800 DEG C, fluidizing gas is introduced, quartz sand and the particulate materials obtained in the step 2) are placed, activation is performed for 1-10 min, a mixture is discharged immediately after activation and washed to be neutral with water, and the activated carbon with the specific surface area being 1267-1359 m<2> / g is obtained. According to the method, a chemical activation method is combined with the fluidized bed technology, rapid activation preparation of the activated carbon can be realized, the activation time is short, the prepared activated carbon has the relatively high specific surface area, the energy consumption is effectively reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon with a high specific surface area through rapid fluidization activation. Background technique [0002] Activated carbon is a carbon material with a well-developed pore structure. Because of its large specific surface area, rich surface functional groups, and strong adsorption capacity, it is widely used in medicine, environmental protection, food, electronics, chemical industry, agriculture, national defense and other fields, especially for gas storage. Catalyst carrier, sewage treatment, etc. [0003] Biomass pyrolysis technology is a research hotspot for many scholars, because it is a technology that turns waste into treasure, and can produce activated carbon, bio-oil, combustible gas, etc. Biomass pyrolysis is generally divided into slow pyrolysis and fast pyrolysis. Slow pyrolysis is generally for the purpose of preparing acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
CPCC01P2006/12C01P2006/14C01B32/312C01B32/324C01B32/342C01B32/348C01B32/39
Inventor 李占勇高新源徐庆田玮王瑞芳张建国
Owner TIANJIN UNIV OF SCI & TECH
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