Method for preparing high-specific-surface-area activated carbon from tobacco stalks

A high specific surface area, activated carbon technology, used in chemical instruments and methods, solid waste removal, inorganic chemistry, etc. problems, to achieve the effect of saving process time and energy, easy control, and fast carbonization reaction

Inactive Publication Date: 2013-05-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After harvesting tobacco leaves every year and completing the task of purchasing tobacco leaves, a large number of tobacco stems are either discarded in the fields, or dried and burned to form agricultural solid waste, which not only destroys the ecological environment, but also wastes resources.
The main components of tobacco stems are cellulose, lignin, total sugar, pectin, etc. These are substances containing a large amount of C, H, O, S, N and other elements, so CO, CO 2 , SO 2 , NO 2 The discharge of pollutants such as tobacco and other pollutants seriously threatens the quality of the atmospheric environment, so tobacco stem waste is not suitable for direct combustion, nor is it suitable for returning to the field as fertilizer like straw
Since every tobacco factory or tobacco rebaking factory in my country has a large number of tobacco stems stacked, it not only takes up a lot of storage space, but also causes idle resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After crushing the tobacco stem waste, take 150-mesh particles, mix the particles and KOH at a weight ratio of 2:1, add water and soak for 14 hours, stir thoroughly, filter, and vacuum-dry at 100°C for 3 hours, then put the dried mixture in Under the protection of nitrogen, use a tubular electric furnace to heat up to 600°C at a heating rate of 12°C / min, keep it for 1.5h, then cool and wash to pH=7, then vacuum dry at 100°C for 3h, and grind to obtain activated carbon products.

[0027] The main index of the tested product activated carbon is the specific surface area of ​​852sq m / g, and the micropores and mesopores account for 76% of the total pore volume.

Embodiment 2

[0029] After the tobacco stem waste is crushed, take particles of about 150 meshes, mix the particles and KOH at a mass ratio of 1:4, add water and stir thoroughly, filter after soaking for 12 hours, and vacuum-dry at 105°C, and then dry the dried mixture Under the protection of nitrogen, use a tubular electric furnace to heat up to 480°C at a heating rate of 15°C / min, keep it for 1.5h, then cool and wash to pH=7, then vacuum dry at 100°C for 3h, and grind to obtain activated carbon products . The main index of the tested product activated carbon is the specific surface area of ​​1208sq m / g, and the micropores and mesopores account for 82% of the total pore volume.

Embodiment 3

[0031] Take about 150 mesh particles and K 2 CO 3 Mix according to the mass ratio of 1:1, add water and stir thoroughly, impregnate for 12 hours, filter, vacuum dry at 105°C, and then heat the dried mixture with a tubular electric furnace at a rate of 10°C / min under nitrogen protection Heating to 500°C, keeping it for 1.5h, then cooling, washing to pH=7, vacuum drying at 105°C for 3h, and grinding to obtain the activated carbon product. The main index of the tested product activated carbon is the specific surface area of ​​1150sq m / g, and the micropores and mesopores account for 88% of the total pore volume.

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PUM

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Abstract

The invention discloses a method for preparing high-specific-surface-area activated carbon from tobacco stalks, which comprises the following steps: pulverizing tobacco stalks into granules, mixing the granules and an activating agent according to a mass ratio of (1:8)-(2:1), adding the obtained mixture into water, evenly stirring, and impregnating for 10-14 hours; after impregnation is finished, filtering, drying the filter residue, placing into an electric furnace having a nitrogen protective atmosphere, and carbonizing at 450-750 DEG C for 1-2 hours; and after carbonization is finished, cooling in a nitrogen atmosphere, washing the obtained furnace slag, and drying. According to the method, high-quality activated carbon can be simply and quickly prepared from wastes in the tobacco industry. Thus, the method changes wastes into valuable substances, fully utilizes resources, avoids environmental pollution, has good economic benefits and is beneficial to industrial production.

Description

technical field [0001] The invention relates to a method for preparing activated carbon with a high specific surface area from tobacco stems, belonging to the field of new biomass energy utilization. Background technique [0002] Biomass energy ranks fourth in the world's total energy consumption and is becoming one of the main energy sources in the 21st century. Biomass as energy mainly refers to agricultural, forestry and other wastes, such as various crop straws, sugar crops, starch Primary processing of crops and oil crops, forestry and wood processing waste, municipal and industrial organic waste, and animal manure, etc. for fuel (e.g. pellets) or energy from secondary processing (e.g. biogas, microalgae oil) . [0003] Tobacco is one of the important economic crops in our country at present. Tobacco stems are the thick and hard veins of tobacco leaves, accounting for about 25% to 30% of leaf weight, and are by-products of the tobacco industry. After harvesting tobacc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12B09B3/00C01B32/324C01B32/348
Inventor 李立清刘峥李海龙黄贵杰
Owner CENT SOUTH UNIV
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