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Preparation method of asphalt-bonding honeycomb shaped active carbon

A honeycomb activated carbon and pitch bonding technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low strength, high heat treatment temperature, long time, etc., to reduce production costs and drying process. Simple, low energy consumption for production

Active Publication Date: 2014-04-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The honeycomb activated carbon prepared by this method has good heat resistance, large specific surface area, and good water resistance, but the drying conditions are harsh, and the thermal decomposition temperature of the binder PVA is high, resulting in a high secondary heat treatment temperature and increased energy consumption
As another example, the preparation method of honeycomb activated carbon announced in the patent US005389325A is to add powdered phenolic resin to the mud as a binder, and obtain honeycomb activated carbon through curing and activation at a lower temperature, which has a large specific surface area, It has the characteristics of high mechanical strength and good water resistance, but the honeycomb activated carbon is easy to crack during the drying process, and it needs to be dried slowly at a relative humidity greater than 90% to obtain a crack-free honeycomb body, and the larger the size, the green body cracks. The more difficult the situation is to control, resulting in higher heat treatment temperature and high energy consumption, and the water resistance of honeycomb activated carbon will become worse with the increase of treatment temperature
Patent CN101214955A adds a surface modifier emulsion to the plastic mud, and dries the green body twice at 100-200°C to obtain a honeycomb-shaped activated carbon with a large specific surface area and good water resistance, but the drying temperature is high and the drying time is long , increase energy consumption, and the strength is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Dry powder mixing, the specific surface area of ​​850m 2 / g of coal-based activated carbon and methyl cellulose in a mass ratio of 100:6 to form a mixture to obtain a uniformly mixed premix.

[0020] Step 2: wet kneading to prepare plastic mud, adding emulsified asphalt and water with a softening point of 60°C to the premix, according to the mass ratio of coal-based activated carbon: asphalt additive is 100:5, water: coal-based activated carbon The mass ratio of 115:100 is stirred evenly in a kneader to make plastic mud.

[0021] Step 3: Vacuum mud refining, put the kneaded plastic mud material in a mud refining machine and vacuum mud mud for 3 times to obtain a plastic mud section with uniform water distribution.

[0022] Step 4: extrusion molding, put the plastic clay section into the barrel of the hydraulic extruder, and extrude it under a molding pressure of 15MPa to obtain a square prism-shaped honeycomb activated carbon green body.

[0023] Step 5: Dryin...

Embodiment 2

[0026] Step 1: dry powder mixing, the specific surface area of ​​800m 2 / g of wood activated carbon and methyl cellulose powder are mixed in a mass ratio of 100:5 to obtain a uniformly mixed premix.

[0027] Step 2: wet kneading to prepare plastic mud, that is, adding emulsified asphalt and water with a softening point of 60°C to the premix, according to the mass ratio of wood activated carbon: asphalt additive is 100:4, water: the mass ratio of wood activated carbon is 100 :100 Stir evenly in a kneader to make plastic mud.

[0028] Step 3: Vacuum mud refining, that is, put the kneaded plastic mud material in a mud refining machine and vacuum mud mud for 3 times to obtain a plastic mud section with uniform water distribution.

[0029] Step 4: Extrusion molding, put the plastic clay section into the barrel of the hydraulic extruder, start the hydraulic system of the hydraulic extruder to first compact the clay, and then extrude it under a molding pressure of 18MPa to obtain he...

Embodiment 3

[0033] Step 1: dry powder mixing, the specific surface area of ​​1200m 2 / g of coconut shell activated carbon and methyl cellulose are mixed in a mass ratio of 100:6 to obtain a uniformly mixed premix.

[0034] Step 2: wet kneading to prepare plastic mud, adding emulsified asphalt and water with a softening point of 90°C to the premix, according to the mass ratio of coconut shell activated carbon: asphalt additive is 100:10, water: coconut shell activated carbon The mass ratio of 90:100 is stirred evenly in a kneader to make plastic mud.

[0035] Step 3: Vacuum mud refining, that is, put the kneaded plastic mud material in a mud refining machine and vacuum mud mud for 2 times to obtain a plastic mud section with uniform water distribution.

[0036] Step 4: Extrusion molding, that is, put the plastic clay section into the barrel of the hydraulic extruder, start the hydraulic system of the hydraulic extruder to first compact the clay, and then extrude it under a molding pressur...

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Abstract

The invention discloses a preparation method of asphalt-bonding honeycomb shaped active carbon. The honeycomb shaped active carbon is obtained by the steps such as dry powder mixing, wet-process kneading and plastic mud material preparing, vacuum pugging, extruding and forming, and constant-temperature constant-humidity drying. The adopted asphalt is water-based emulsified asphalt which is less in adding amount and easy to knead; when the asphalt brings the bonding effect, dosage of an organic bonding agent is reduced, so that high specific surface area and high strength of the honeycomb shaped active carbon are ensured; besides, the asphalt is added, so that a drying process is simplified; the obtained honeycomb shaped active carbon has no fracture and has high strength, and can be applied to the engineering application scope of indoor air purifying equipment such as an air purifier and a central air conditioner; besides, equipment needed for the production process is simple, dosage of the organic bonding agent is less, drying temperature is low and drying process is simple, so that production cost and energy consumption are effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of materials and environmental protection, and relates to a preparation method of honeycomb activated carbon, in particular to a preparation method of asphalt-bonded honeycomb activated carbon. Background technique [0002] Honeycomb activated carbon has the advantages of regular shape, easy adjustment and processing, high porosity, large geometric surface area, wear resistance, high thermal conductivity and strength, no dust pollution, high adsorption capacity per unit volume, etc., and pressure drop, The adsorption and desorption speed is fast, and it is a new type of carbon material with excellent adsorption and desorption performance, which can be conveniently used for gas purification and solvent recovery. At the same time, honeycomb activated carbon is also an excellent catalyst carrier, and has broad application prospects in the fields of flue gas desulfurization, selective catalytic reduction denitri...

Claims

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Application Information

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IPC IPC(8): C01B31/08C01B32/30
Inventor 黄正宏张江刘国强申克康飞宇
Owner TSINGHUA UNIV