Method for preparing tobacco activated carbon based on low temperature plasma modification

A technology of low-temperature plasma and activated carbon, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve the effects of enriching surface chemical properties, improving adsorption and removal, and increasing specific surface area

Active Publication Date: 2015-11-18
CHINA TOBACCO ANHUI IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another object of the present invention is to solve some deficiencies in the preparation of activated carbon from existing tobacco, and provide a method for preparing activated carbon with high specific surface area and rich surface chemical properties by modifying tobacco coke with low temperature plasma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take a certain amount of dried and pulverized tobacco rod particles with a particle size of less than 70 meshes, quickly put them into a tube electric furnace at a temperature of 800°C, and pyrolyze them for 1 hour under the protection of nitrogen, and then cool them under a nitrogen atmosphere to obtain tobacco coke samples. Put the charred tobacco sample in a hydrochloric acid solution with a mass concentration of 20% for 2 hours, and then wash it until neutral; then put the charred sample in a 5% potassium carbonate solution and soak it for 2 hours, filter and dry the charred sample , to obtain a modified tobacco coke sample; place the modified tobacco coke sample on the lower plate of the low-temperature plasma generator, with a thickness of 0.3 mm; adjust the distance between the two pole plates of the low-temperature plasma generator to 60 mm; The internal pressure of the low-temperature plasma generator is pumped to 800-1000Pa; adjust the working voltage between t...

Embodiment 2

[0023] Take a certain amount of dry and pulverized tobacco rod particles with a particle size of less than 70 mesh, quickly put them into a tube-type electric furnace at a temperature of 800 ° C, and pyrolyze them under the protection of nitrogen for 2 hours, then cool them under a nitrogen atmosphere to obtain tobacco coke samples . Put the tobacco coke sample into a hydrochloric acid solution with a concentration of 20% for 2 hours, and then clean it to neutrality; place the modified tobacco coke sample on the lower plate of the low-temperature plasma generator, with a thickness of 0.3 mm; adjust the distance between the two plates of the low-temperature plasma generator to 40mm; pump the internal air pressure of the low-temperature plasma generator to 800-1000Pa; adjust the working voltage between the two plates of the low-temperature plasma generator to 100V, and the current to 0.45A, The sample was treated in the air atmosphere for 20 minutes, and the coke sample was take...

Embodiment 3

[0025] Take a certain amount of dry and pulverized tobacco rod particles with a particle size of less than about 70 meshes, quickly put them into an electric tube furnace at a temperature of 800°C, pyrolyze them for 2 hours under the protection of nitrogen, and then cool them under a nitrogen atmosphere to obtain tobacco coke samples. Put the tobacco coke sample into a hydrochloric acid solution with a concentration of 20% for 2 hours, and then clean it to neutrality; place the modified tobacco coke sample on the lower plate of the low-temperature plasma generator, with a thickness of 0.2 mm; adjust the distance between the two plates of the low-temperature plasma generator to 20mm; pump the internal pressure of the low-temperature plasma generator to 800-1000Pa, and then inject oxygen into the low-temperature plasma; adjust the distance between the two plates of the low-temperature plasma generator The working voltage is 200V, the current is 0.22A, the sample is treated in an ...

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Abstract

The invention discloses a method for preparing tobacco activated carbon based on low temperature plasma modification. The method is characterized by comprising the steps of: firstly drying and crushing waste and inferior tobacco into fine particles, and performing high temperature carbonization on the fine particles under nitrogen protection so as to obtain tobacco scorching samples; then putting the tobacco scorching samples into an inorganic acid solution for treatment, then cleaning the treated tobacco scorching samples until the cleaned tobacco scorching samples are neutral, putting the neutral scorching samples into an activator solution, macerating the neutral scorching samples in the activator solution, filtering the macerated scorching samples, and drying the filtered scorching samples; and finally, treating the scorching samples with low temperature plasma under activated gas atmosphere so as to obtain the tobacco activated carbon. According to the method disclosed by the invention, the waste and inferior tobacco in cigarette plants is directly prepared into the high-quality activated carbon, so that the cost of raw materials is low, and the purpose of locally transforming and utilizing the waste and inferior tobacco is realized. In addition, through the treatment of the low temperature plasma and under the joint action of fitting modification conditions, an activator and activated gas, the specific surface area of the tobacco activated carbon is enlarged, and the surface chemistry characteristics of the tobacco activated carbon are enriched.

Description

1. Technical field [0001] The invention relates to a preparation technology of an environmentally friendly adsorption material, in particular to a technical method for preparing tobacco activated carbon through low-temperature plasma modification. 2. Background technology [0002] Tobacco has always been one of the important economic crops in our country. About 20-30% of the raw materials in the tobacco production process are waste tobacco, which cannot be used to make cigarettes and are wastes generated in the cigarette production process. According to statistics, in recent years, China has planted about 20 million acres of tobacco leaves annually, and produced about 2.5 million tons of tobacco leaves. Also, millions of tons of waste tobacco are produced every year. In the past, most of these waste tobacco was treated as garbage, which not only polluted the environment but also caused a waste of natural resources. Therefore, how to effectively utilize these waste tobacco ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B31/12C01B32/336
Inventor 徐迎波陈开波田振峰吕进葛少林张军顾中铸
Owner CHINA TOBACCO ANHUI IND CO LTD
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