Method for preparing active carbon by taking biomass pyrolytic carbon as raw material

A technology for preparing activated carbon and biomass pyrolysis. It is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc. It can solve the problem of not much biomass pyrolysis carbon, and achieve developed pores, increased added value, and high adsorption value. Effect

Inactive Publication Date: 2014-08-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that ZnCl 2 and H 3 PO 4 They are two commonly used and better chemical activators, but there are not many reports on the activation of biomass pyrolytic carbon, so it is worthy of research and exploration

Method used

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  • Method for preparing active carbon by taking biomass pyrolytic carbon as raw material
  • Method for preparing active carbon by taking biomass pyrolytic carbon as raw material
  • Method for preparing active carbon by taking biomass pyrolytic carbon as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The pyrolytic charcoal obtained by rapid pyrolysis of Chinese fir is washed with distilled water, stirred, left standing, and precipitated to remove the gravel contained therein. Take the pyrolytic charcoal floating on the upper layer, dry it, and pulverize the dried pyrolytic charcoal, pass through a 60-mesh sieve, and set aside. An aqueous solution of zinc chloride is prepared, and the aqueous solution is mixed with pyrolytic carbon, stirred and impregnated. The mass ratio of pyrolytic carbon to zinc chloride is 1:2. The mixed solution was dried in an oven for 6 hours, and the temperature was controlled at 100°C. Then, the carbon powder is placed in a heating furnace to raise the temperature for activation, and nitrogen protection is introduced during the heating process. After the desired temperature was reached, the nitrogen was turned off and carbon dioxide was introduced at a flow rate of 0.05 L / min. The activation temperature is 500°C, and the activation time i...

Embodiment 2

[0026] The method is similar to Example 1, except that the chemical activator is replaced by phosphoric acid, and the mass ratio of pyrolytic charcoal and phosphoric acid is changed to 1:10, and the activation temperature is changed to 800°C. The pyrolytic charcoal obtained by rapid pyrolysis of Chinese fir is washed with distilled water, stirred, left standing, and precipitated to remove the gravel contained therein. Take the pyrolytic charcoal floating on the upper layer, dry it, and pulverize the dried pyrolytic charcoal, pass through a 60-mesh sieve, and set aside. An aqueous solution of phosphoric acid is prepared, and the aqueous solution is mixed with pyrolytic carbon, stirred and impregnated. The mass ratio of pyrolytic carbon to phosphoric acid is 1:10. The mixed solution was dried in an oven for 6 hours, and the temperature was controlled at 100°C. Then, the carbon powder is placed in a heating furnace to raise the temperature for activation, and nitrogen protection...

Embodiment 3

[0029] The method is similar to that of Example 1, except that the chemical activator is replaced by potassium hydroxide, and the flow rate of carbon dioxide is changed to 2L / min. The pyrolytic charcoal obtained by rapid pyrolysis of Chinese fir is washed with distilled water, stirred, left standing, and precipitated to remove the gravel contained therein. Take the pyrolytic charcoal floating on the upper layer, dry it, and pulverize the dried pyrolytic charcoal, pass through a 60-mesh sieve, and set aside. An aqueous solution of potassium hydroxide is prepared, and the aqueous solution is mixed with pyrolytic charcoal, stirred and impregnated. The mass ratio of pyrolytic charcoal to potassium hydroxide is 1:2. The mixed solution was dried in an oven for 6 hours, and the temperature was controlled at 100°C. Then, the carbon powder is placed in a heating furnace to raise the temperature for activation, and nitrogen protection is introduced during the heating process. After th...

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Abstract

The invention relates to a method for preparing active carbon by taking biomass pyrolytic carbon as a raw material, and relates to post processing of the biomass pyrolytic carbon. The method comprises the following steps: cleaning the pyrolytic carbon, stirring, then standing and depositing, drying the pyrolytic carbon floating on an upper layer, and then crushing; preparing a chemical activating agent solution, then mixing, stirring and soaking with the pyrolytic carbon, then drying a soaked mixed solution to obtain a mixed material; and heating the mixed material to 300-800 DEG C at an inert gas atmosphere, introducing a physical activating agent to obtain an active carbon semi-finished product, then adding hydrochloric acid, mixing, then carrying out suction filtration, then cleaning residual hydrochloric acid, and drying to obtain an active carbon finished product. The method disclosed by the invention carries out activating treatment on the biomass pyrolysis of agricultural and forestry wastes and the like, can be used for furthest recycling the agricultural and forestry wastes and can obviously increase the added value of the pyrolytic carbon and obtain the active carbon with excellent property; compared with a product prepared by independently using a chemical activation method or a physical activation method, the prepared active carbon is much larger in specific area, more developed in pore and higher in methylene blue adsorption value.

Description

technical field [0001] The invention relates to a post-treatment of biomass pyrolytic carbon, in particular to a method for preparing activated carbon by using biomass pyrolytic carbon as a raw material. Background technique [0002] Activated carbon has become a widely used high-efficiency adsorbent due to its well-developed pore structure, high specific surface area, high surface activity, and diverse surface chemical properties. Raw materials for making activated carbon can be coal, wood, fruit shells, etc. In the current situation of resource shortage, energy shortage, and environmental degradation, the recycling and clean utilization of resources have prompted the raw materials used in the production of activated carbon to lean towards the direction of waste recycling, such as the use of waste tires and lignocellulosic plant waste. [0003] Biomass pyrolysis is a process in which biomass is liquefied to produce bio-oil and pyrolytic carbon under certain temperature and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/318C01B32/342C01B32/348
Inventor 张本镔刘运权
Owner XIAMEN UNIV
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