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Method for preparing rice husk-based active carbon by solution immersion-cleaning and de-ashing

A technology of activated carbon and rice husk carbon, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low specific surface area and underdeveloped pore structure of activated carbon, and achieve excellent adsorption performance, good adsorption, and large pores The effect of well-developed structure

Active Publication Date: 2015-03-25
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when rice husk charcoal is used as raw material, the specific surface area of ​​activated carbon prepared by physical activation method is low, and the pore structure is not developed enough.

Method used

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  • Method for preparing rice husk-based active carbon by solution immersion-cleaning and de-ashing
  • Method for preparing rice husk-based active carbon by solution immersion-cleaning and de-ashing

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Rice husk char is a by-product of pyrolysis of rice husk to produce bio-oil. The specific preparation process is as follows: the rice husk is sent into the moving bed pyrolysis reactor through the screw feeder, heated to 510°C at a speed of 480°C / s, the residence time of the rice husk in the pyrolysis reactor is 4s, and then passed through The cyclone separator separates and collects rice husk charcoal.

[0027] (1)CO 2 Activation stage: sieve rice husk charcoal, select particles with a particle size between 40 and 60 meshes; weigh 5g of rice husk charcoal powder obtained by sieving, put it in a quartz boat, and then place the quartz boat in a programmed temperature rise furnace within; in N 2 Heating to 900°C under protection, the heating rate is 10°C / min, N 2 The flow rate is 500mL / min; change to CO 2 , flow rate is 800mL / min, activation 1h; in N 2 Cool to room temperature under protection, N 2 The flow rate is 500mL / min;

[0028] (2) Solution immersion stage: ...

Embodiment 2

[0031] The rice husk charcoal used is the same as that used in Example 1.

[0032] (1)CO 2 Activation stage: sieve rice husk charcoal, select particles with a particle size between 40 and 60 meshes; weigh 5g of rice husk charcoal powder obtained by sieving, put it in a quartz boat, and then place the quartz boat in a programmed temperature rise furnace within; in N 2 Heating to 900°C under protection, the heating rate is 10°C / min, N 2 The flow rate is 500mL / min; change to CO 2 , flow rate is 800mL / min, activation 1h; in N 2 Cool to room temperature under protection, N 2 The flow rate is 500mL / min;

[0033] (2) Solution immersion stage: weigh CO 2 2 g of the activated sample was placed in a round bottom flask, and 4 mol / L of K was added 2 CO 3 Solution 20mL, under reflux conditions, boiling under normal pressure for 2h; stop heating, filter after cooling to room temperature, wash the solid precipitate repeatedly with hot distilled water until the washing liquid is neutr...

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Abstract

The invention discloses a method for preparing rice husk-based active carbon by solution immersion-cleaning and de-ashing. The used raw material is a byproduct rice husk charcoal produced by preparing bio-oil by quickly performing pyrolysis on the rice husks. The method comprises the following steps: firstly, activating the rice husk charcoal in the presence of CO2; then, performing immersion-cleaning and de-ashing by an alkaline solution; and finally, washing until the filtrate is neutral. The method of preparing rice husk-based active carbon by solution immersion-cleaning and de-ashing has significance in two aspects: firstly, the ash substances in the rice husk charcoal are effectively removed without high-temperature chemical activation, and the ash substances are prepared into active carbon with high porosity; and secondly, the high-value utilization of the pyrolysis rice husk charcoal is realized, so that the economical efficiency of the rice husk pyrolysis process is improved. In the active carbon preparation process, the method has the characteristics of small corrosion and less time consumption; and the prepared active carbon has a high specific surface area, low ash content, a high mesoporous rate and good adsorption performance, and is an ideal adsorption material, electrode material and catalyst carrier.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, and specifically relates to a method for preparing activated carbon, more specifically, a method for preparing activated carbon by using rice husk charcoal as a raw material through solution leaching and deashing. Background technique [0002] Activated carbon is a carbonaceous material with a well-developed pore structure, which can be used as an adsorbent, catalyst carrier and electrode material, etc. application. [0003] The traditional raw materials for the production of activated carbon are coal and wood. However, coal is a non-renewable resource with a high price, and contains heavy metals or harmful elements such as lead, mercury, arsenic and sulfur, while my country's forest resources are relatively scarce. Therefore, it is of great practical significance to use biomass raw materials such as rice husk and straw to produce activated carbon. They are abundant, inexp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 朱锡锋李明马善为
Owner UNIV OF SCI & TECH OF CHINA
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