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Method for preparing pressed active carbon from tobacco stalk

A technology for shaping activated carbon and tobacco stalks, which is applied in the field of preparing shaped activated carbon, which can solve the problems of affecting the adsorption effect, difficulty in scale-up, inconvenient use, etc., and achieve increased volume adsorption, good social and economic benefits, and low cost. Effect

Inactive Publication Date: 2009-04-15
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the zinc chloride method needs to be washed with hydrochloric acid, and the pollution is serious; the microwave radiation method has high requirements on equipment because microwave radiation is used as a heat source, and there are difficulties in scale.
At the same time, although powdered activated carbon has the characteristics of fast adsorption speed due to its fine particle size and large external area, it also has the disadvantages of difficult regeneration and inconvenient use. The impact of air flow or water flow can easily cause local "short circuit" or "blockage", which affects the adsorption effect

Method used

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  • Method for preparing pressed active carbon from tobacco stalk

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Tobacco stems produced in Mengzi County, Yunnan Province are used as raw materials.

[0025] After crushing 100g of the above tobacco rod raw material to 0.5-0.8mm, put it into a tubular resistance furnace, under the protection of nitrogen, heat and carbonize at a heating rate of 10°C / min, raise it to 300-400°C, and keep it warm for 30-60min; Mix the carbonized tobacco rod with KOH evenly, KOH / C is 2-3.5, under the protection of nitrogen, heat and activate at a heating rate of 5°C / min, raise it to 400°C, keep it for 30min, and then heat it at a temperature of 10°C / min Raise the heating rate to 700-800°C and keep it warm for 30-90 minutes; wash the activated sample with water to obtain powdered activated carbon; then mix powdered activated carbon with 10-30% sodium carboxymethyl cellulose, and 5-15 % of calcium carbonate pore-forming agent, and under the pressure of 10-15Mpa, press it into a round cake-shaped carbon block with a diameter of 3-5cm and a thickness of 0.4-0...

Embodiment 2

[0027] Tobacco stems produced in Mile County, Yunnan Province are used as raw materials.

[0028] After crushing 100g of the above tobacco rod raw material to 0.5-0.8mm, put it into a tubular resistance furnace, under the protection of nitrogen, heat and carbonize at a heating rate of 10°C / min, raise it to 300-400°C, and keep it warm for 30-60min; Mix the carbonized tobacco rod with KOH evenly, KOH / C is 2-3.5, under the protection of nitrogen, heat and activate at a heating rate of 5°C / min, raise it to 400°C, keep it for 30min, and then heat it at a temperature of 10°C / min Raise the heating rate to 700-800°C and keep it warm for 30-90 minutes; wash the activated sample with water to obtain powdered activated carbon; then mix the powdered activated carbon with 10-30% polyvinyl alcohol and 5-15% carbonic acid Calcium pore-forming agent is mixed, and under the pressure of 10-15Mpa, it is pressed into a round cake-shaped carbon block with a diameter of 3-5cm and a thickness of 0.4...

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Abstract

The invention disclose a method for preparing pressed active carbon by using tobacco-stem, which comprises the following steps of: crashing the tobacco-stem to be 0.5-0.8mm, carrying out heating carbonization with the temperature-raising speed of 10 DEG C / min and under protection of nitrogen, raising the temperature to 300-400DEG C, and carrying out temperature preservation for 30-60min; mixing the tobacco-stem after carbonization with KOH evenly, raising the temperature to 400 DEG C with the temperature-raising speed of 5 DEG C / min and under the protection of nitrogen, carrying out temperature preservation for 30min, then raising the temperature to 700-800 DEG C with the temperature-raising speed of 10 DEG C / min and carrying out temperature preservation for 30-90min; washing activated samples by using clear water and obtaining powder-shaped active carbon; mixing the powder-shaped active carbon with a binder and a pore-creating activator; and carrying out press forming at pressure of 10-15 MPa, placing the mixture into a tube type resistance furnace, raising temperature to 800-850 DEG C with the temperature-raising speed of 5 DEG C / min and under the protection of nitrogen, carrying out temperature preservation for 30-60min, and obtaining the pressed active carbon after cooling.

Description

technical field [0001] The invention relates to a method for preparing shaped activated carbon by using waste tobacco rods as raw materials. Background technique [0002] As an important economic crop, tobacco has a large output. According to the 2007 China Statistical Yearbook, the annual output of tobacco leaves in my country is 2.74 million tons, and the output ratio of tobacco leaves and tobacco stalks is 1:1, correspondingly, 2.74 million tons of tobacco stalks should be produced. Tobacco stalks are not suitable for fuel, nor are they suitable for returning stalks to the field as fertilizer. A large amount of tobacco stalks are discarded or burned, which seriously pollutes the air environment. The use of tobacco stalks to prepare activated carbon materials can make full use of tobacco stalks, providing a way for high value-added utilization of this waste, and the activated carbon material itself is an environmental ecological material that will naturally degrade after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 张承龙
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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