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Method for washing active carbon

A technology of activated carbon and water washing tower, which is applied in the direction of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems that are not conducive to the large-scale production of super activated carbon, large water consumption, time-consuming and labor-intensive, etc., to achieve large-scale washing, Improvement of washing efficiency and reduction of recovery pressure

Inactive Publication Date: 2009-07-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the washing process is time-consuming and laborious, consumes a lot of water, and has low efficiency, which is not conducive to the large-scale production of super activated carbon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix petroleum coke with a weight ratio of 1:1 and KOH (total weight 1 kg) evenly, raise from room temperature to 1000 °C in the presence of N2, and when the temperature is lowered to close to room temperature, take out the activated product and add 2 kg of water to prepare Slurry is then added from the upper part of the water washing tower at a rate of 1kg / h, and water is added from the lower part of the water washing tower at a rate of 20L / h, so that the activated product and water are reversely contacted in the water washing tower to wash the activated product. The residence time in the tower is 0.5h.

Embodiment 2

[0017] Mix anthracite with a weight ratio of 1:10 and KOH (total weight 10 kg) evenly, raise from room temperature to 800°C in the presence of N2, and when the temperature is lowered to close to room temperature, take out the activated product and add 10 kg of water to prepare The slurry is then added from the upper part of the water washing tower at a speed of 2kg / h, and water is added from the lower part of the water washing tower at a speed of 2000L / h, so that the activated product and water are reversely contacted in the water washing tower to wash the activated product. The residence time within is 1 h.

Embodiment 3

[0019] Mix the needle coke and KOH (total weight 20 kg) with a weight ratio of 1:4 evenly. In the presence of Ar, raise the temperature from room temperature to 1000 ° C, and when the temperature is lowered to close to room temperature, take out the activated product and add 50 kg of water Make a slurry, then add it from the upper part of the water washing tower at a speed of 20kg / h, and add water from the lower part of the water washing tower at a speed of 1000L / h, so that the activated product and water are reversely contacted in the water washing tower to wash the activated product. The residence time in the washing tower is 0.5h.

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Abstract

The invention relates to a method for washing active carbon, which comprises that: a carbonous precursor and KOH or NaOH are evenly mixed, and the weight ratio of the carbonous precursor to the KOH or the NaOH is 1 to 1 : 1-10; in the presence of inert atmosphere, temperature rises from room temperature to temperature of between 800 and 1,000 DEG C, when the temperature is reduced to be close to the room temperature, an activation product is taken out; after slurry is prepared from the activation product and water in weight ratio of 1: 5-10, the slurry is added from the upper part of a water scrubbing tower at a speed of between 1 and 100 kg / h, and the water is added from the lower part of the water scrubbing tower at a speed of between 20 and 2,000 L / h so that the activation product and the water are reversely contacted in the water scrubbing tower for washing the activation product; and the dwell time of the activation product in the water scrubbing tower is between 0.5 and 1 hour. The method has the advantages of substantially reducing water for washing, greatly lightening reclaiming pressure of subsequent waste lye, reducing reclaiming cost, lightening labor intensity of routine washing, improving washing productivity, and being favorable for scale washing.

Description

technical field [0001] The invention belongs to a method for washing activated carbon, and specifically provides a method for preparing activated carbon by using KOH or NaOH to chemically prepare carbon-containing precursors, and the activated product needs to be washed with water to obtain activated carbon with alkali removed Methods. Background technique [0002] The preparation of super activated carbon generally uses a strong base such as KOH or NaOH to activate the carbon-containing precursor. After activation, the activated carbon containing strong base is obtained. The activated carbon needs to be washed with a large amount of water or acid to obtain super activated carbon. At present, in the literature or related patents, there is no clear description of the washing method of the activated product, and only the conventional vacuum filtration or centrifugation method is used for purification. In this refining process, a large amount of water is generally required to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B31/10C01B32/336
Inventor 李开喜
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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