A kind of regeneration method of activated carbon with low carbon loss

A technology of activated carbon and waste activated carbon, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of secondary pollution of organic solvents, difficulty in implementation, and decreased adsorption capacity, and achieve high-efficiency regeneration and adsorption Good performance recovery and increased porosity

Active Publication Date: 2019-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the existing activated carbon regeneration methods have the following disadvantages: ①The loss of activated carbon is large; ②The adsorption capacity will decrease significantly after regeneration; ③The tail gas generated during regeneration will cause secondary pollution; ④The regeneration conditions are harsh and difficult to implement. , high cost, low economic benefit
[0006] The current mainstream of activated carbon regeneration technology is high-temperature regeneration and solvent regeneration. High-temperature regeneration cannot avoid the problem of high energy consumption. Solvent regeneration can easily cause secondary pollution of organic solvents and other issues.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The regeneration method of activated carbon comprises the following steps:

[0037] First, take the waste activated carbon (mainly containing organic matter and complex components, such as phenols, alcohols, benzene and its derivatives) after the industrial wastewater treatment of a domestic enterprise, wash the waste activated carbon 2 to 3 times with deionized water, and remove the waste activated carbon. The acidic substances and some soluble inorganic substances can be filtered and separated to prevent side reactions with the catalyst and affect the catalytic effect;

[0038] Secondly, the activated carbon obtained by filtration and separation is mixed with Fe at a mass ratio of 0.5%. 2 o 3 As a catalyst, mix it evenly with deionized water according to the liquid-solid ratio of 2:1, add it to the p-polyphenylene hydrothermal synthesis reaction kettle, heat it to 230 ° C, the air pressure is 28 atm, keep the temperature and pressure for 1 hour, and carry out organic...

Embodiment 2

[0043] The regeneration method of activated carbon comprises the following steps:

[0044] First, wash the spent activated carbon with deionized water for 2 to 3 times to remove the acidic substances and part of the soluble inorganic substances, prevent side reactions with the catalyst and affect the catalytic effect, and then filter and separate;

[0045] Secondly, the activated carbon obtained by filtration and separation is mixed with Fe with a mass ratio of 1%. 2 o 3As a catalyst, mix it evenly with deionized water according to the liquid-solid ratio of 6:1, add it to the p-polyphenylene hydrothermal synthesis reactor, heat it to 250 ° C, the air pressure is 40 atm, keep the temperature and pressure for 3 hours, and carry out organic Decomposition and stripping reaction, take out the material when cooled to below 50°C;

[0046] Finally, dilute the slurry with 5% dilute hydrochloric acid to a liquid-solid ratio of 30-20:1, place it in an ultrasonic vibrating cleaner and w...

Embodiment 3

[0049] The regeneration method of activated carbon comprises the following steps:

[0050] First, wash the spent activated carbon with deionized water for 2 to 3 times to remove the acidic substances and part of the soluble inorganic substances, prevent side reactions with the catalyst and affect the catalytic effect, and then filter and separate;

[0051] Secondly, the activated carbon obtained by filtration and separation is mixed with Fe with a mass ratio of 2%. 2 o 3 As a catalyst, mix it evenly with deionized water according to the liquid-solid ratio of 8:1, add it to the p-polyphenylene hydrothermal synthesis reaction kettle, heat it to 260 ° C, the air pressure is 47 atm, keep the temperature and pressure for 3 hours, and carry out organic Decomposition and stripping reaction, take out the material when cooled to below 50°C;

[0052] Finally, dilute the slurry with 5% dilute hydrochloric acid to a liquid-solid ratio of 30-20:1, place it in an ultrasonic vibrating clea...

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Abstract

The invention discloses a regeneration method of low-carbon-loss activated carbon. Activated carbon is pretreated by iron or an iron compound as a catalyst at lower temperature, and the synergic actions of dilution and ultrasonic washing are performed; and thus, the regenerated activated carbon with high adsorptive value is obtained under the conditions of low energy consumption and mild conditions, and the carbon loss can be reduced to a large extent.

Description

technical field [0001] The invention belongs to the field of regeneration of waste activated carbon, and in particular relates to a method for regeneration of activated carbon with low carbon loss. Background technique [0002] Activated carbon regeneration refers to the process of removing the adsorbate adsorbed on the micropores of activated carbon by physical or chemical methods without destroying the original structure of activated carbon, and restoring its adsorption performance. At present, activated carbon regeneration methods mainly include ultrasonic regeneration method, electrochemical regeneration method, superfluid regeneration method, solvent regeneration method, oxidation regeneration method, thermal regeneration method, biological regeneration method, etc. Generally, the existing activated carbon regeneration methods have the following disadvantages: ①The loss of activated carbon is large; ②The adsorption capacity will decrease significantly after regeneration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34B01J20/20
CPCB01J20/3416B01J20/3441B01J20/3475
Inventor 肖劲余柏烈仲奇凡袁杰姚桢张留运
Owner CENT SOUTH UNIV
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