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Production of formed active carbon with low-dielectric material carbonized and activated by microwave

A technology of forming activated carbon and dielectric properties, which is applied in the direction of chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems affecting the activity of activated products, energy consumption, and small specific surface area, so as to avoid energy consumption and activity reduction, The effect of improving absorption capacity and simple preparation method

Inactive Publication Date: 2006-03-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method solves the problem of microwave absorption by wood chips or tobacco rod solid waste, it can be activated by microwave charcoal to make activated carbon materials, but because these chemical substances will remain in the activated product in the form of metal salts after being activated by charcoal. In the micropores, it must be washed with acid and a large amount of water to remove metal salt residues, otherwise the activity of the activated product will be affected due to the small specific surface area
Due to pickling and water washing, on the one hand, it will inevitably consume acid, water, energy, and increase costs, and on the other hand, the preparation cycle will also be increased.
In addition, this method is only suitable for the preparation of powdered activated carbon, and is not suitable for the preparation of geometrically shaped activated carbon, activated carbon adsorbents, and activated carbon catalysts required by chemical engineering, food, and environmental engineering.
However, the existing methods for preparing shaped activated carbon are generally formed by bonding the prepared powdered activated carbon with organic and inorganic binders, which will not only affect the activity of the product to a certain extent, but also require Heat treatment at high temperature to increase product strength and water stability, further increasing cost and production cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 80 parts of furfural slag with a particle size of 200 mesh after crushing, 30 parts of carbon powder, 12 parts of phenolic resin, 5 parts of clay, and 5 parts of polyethylene glycol, and add water until the mixture contains 20 parts of water; Process into a spherical shape; send the spherical shaped product into a microwave generator, and carbonize it at a power of 750W for 5 minutes; then pass carbon dioxide gas into the microwave generator, and activate it at a power of 700W for 6 minutes to obtain a spherical shape. Finished shaped activated carbon. The yield of activated carbon is 50%, and the specific surface area is 600 square meters per gram.

Embodiment 2

[0028] Mix 90 parts of wood chips with a particle size of 150 mesh after crushing, 10 parts of copper oxide: vanadium pentoxide (1:1), 20 parts of phenolic resin, and 5 parts of hydroxymethyl cellulose, and add water until the mixture contains 18 parts of water; Process the humidity-adjusted mixture into a cylindrical shape; send the cylindrical molding into a microwave generator, and carbonize it at a power of 600W for 8 minutes; then feed carbon dioxide into the microwave generator and activate it at a power of 600W for 10 The cylindrical shaped activated carbon can be obtained in minutes. The yield of activated carbon is 50%, and the specific surface area is 750 square meters per gram.

Embodiment 3

[0030] Mix 80 parts of wood chips with a particle size of 250 mesh after crushing: bamboo chips (1:1) with 20 parts of charcoal powder, 10 parts of phenolic resin, and 10 parts of clay, and add water until the mixture contains 22 parts of water; Extrude into a honeycomb shape in a molding machine; send the honeycomb shaped product into a microwave generator, and carbonize it at a power of 300W for 20 minutes; then pass water vapor into the microwave generator, and activate it at a power of 800W for 15 minutes That is, honeycomb-shaped finished activated carbon is obtained. The yield of activated carbon is 60%, and the specific surface area is 800 square meters per gram.

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Abstract

Production of active carbon from carbonized and activated low-dielectric materials by microwave directly is carried out by blending broken low-dielectric materials 40-90 proportion with high-dielectric materials 10-40 proportion and binder 5-20 proportion, adding into water until the mixtures with water 15-30 proportion, form into a geometry, entering the formed substances into microwave generator, carbonizing at 300-750W for 5-20mins, inducing activator into microwave generator and activating at 500-800W for 5-20mins. It achieves low cost, short production period and resources saving.

Description

1. Technical field [0001] The invention belongs to the technical field of activated carbon preparation, and in particular relates to a method for directly carbonizing and activating low-dielectric materials by microwave heating to prepare shaped activated carbons of various shapes. 2. Background technology [0002] As we all know, microwave heating not only has the characteristics of high efficiency, non-contact, integrity, uniformity, fast heating and cooling, low energy consumption, and simple operation, but also has strong selectivity for heated substances. [0003] The principle of microwave heating is: through the high-frequency oscillation generated by the microwave generator, the alternating electric field is applied, so that the polar molecules of the heated substance placed in the electric field vibrate at the same frequency as the electric field polarity, thereby converting the electromagnetic energy into Molecular thermal kinetic energy intensifies the molecular m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B31/10C01B32/336
Inventor 华坚尹华强吴莉丽刘勇军汪南方
Owner SICHUAN UNIV