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Vacuum thermal regeneration method of saturated activated carbon for adsorbing VOCs (volatile organic compounds)

A technology of activated carbon and vacuum heat, applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve the problems of low regeneration efficiency, large carbon loss, and difficulty in satisfying multiple recycling.

Pending Publication Date: 2021-10-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the problems of decreased structural strength of activated carbon after regeneration, large carbon loss, and low regeneration efficiency, and it is difficult to meet the requirements of multiple recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Evenly fill the honeycomb activated carbon that has adsorbed ethyl acetate to saturation in the vacuum furnace, the amount of activated carbon charged is 100g, close the vacuum furnace and start vacuuming, and the pressure in the furnace is stable at 10Pa at room temperature. After the pressure is stable, start to heat up, from normal temperature to 280°C and keep it warm for 20 minutes. After the heat preservation stage, enter the cooling stage. When the furnace temperature drops below 100°C, break the vacuum and take out the activated carbon. The whole desorption process maintains a vacuum state in the vacuum furnace. It was determined that the adsorption performance of the regenerated activated carbon on ethyl acetate recovered to 91% of that of the new activated carbon.

Embodiment 2

[0036] Evenly fill the honeycomb activated carbon that has adsorbed ethyl acetate to saturation in the vacuum furnace, the amount of activated carbon charged is 100g, close the vacuum furnace and start vacuuming, and the pressure in the furnace is stable at 10Pa at room temperature. After the pressure is stable, start to heat up, from normal temperature to 300°C and keep it warm for 20 minutes. After the heat preservation stage, enter the cooling stage. When the furnace temperature drops below 100°C, break the vacuum and take out the activated carbon. The whole desorption process maintains a vacuum state in the vacuum furnace. It was determined that the performance of the regenerated activated carbon on ethyl acetate recovered to 92% of that of the new activated carbon.

Embodiment 3

[0038] Evenly fill the honeycomb activated carbon that has adsorbed ethyl acetate to saturation in the vacuum furnace, the amount of activated carbon charged is 100g, close the vacuum furnace and start vacuuming, and the pressure in the furnace is stable at 10Pa at room temperature. After the pressure is stable, start to heat up, from normal temperature to 350°C and keep it warm for 20 minutes. After the heat preservation stage, enter the cooling stage. When the furnace temperature drops below 100°C, break the vacuum and take out the activated carbon. The whole desorption process maintains a vacuum state in the vacuum furnace. It was determined that the adsorption performance of the regenerated activated carbon on ethyl acetate recovered to 94% of that of the new activated carbon.

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Abstract

The invention discloses a vacuum thermal regeneration method of saturated activated carbon for adsorbing VOCs (Volatile Organic Compounds), which comprises the following processes: in a vacuum environment of 10Pa-100Pa, heating the activated carbon for adsorbing the VOCs to 280-350 DEG C, preserving heat for 20-40 minutes, and then breaking vacuum when the activated carbon is cooled to 100 DEG C or below along with a furnace, so as to realize regeneration of the activated carbon for adsorbing the VOCs. Compared with a traditional thermal desorption method and an existing vacuum regeneration method, the method has the advantages that the desorption efficiency is higher, the desorption speed is higher, meanwhile, the pore size distribution of the activated carbon is improved, the number of micropores is increased, and the activated carbon can be recovered to 95% or above of the adsorption performance of new activated carbon after being regenerated for 10 times.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a vacuum heat regeneration method for adsorbing VOCs saturated activated carbon. Background technique [0002] Activated carbon is widely used in the purification of VOCs-containing waste gas. When using the adsorption performance of activated carbon to adsorb VOCs waste gas, activated carbon will absorb saturated VOCs waste gas after a certain period of time, and lose the ability to re-adsorb. Desorption regeneration, the purpose of regeneration is to desorb the adsorbate adsorbed on activated carbon to restore the adsorption capacity of activated carbon, so as to realize the recycling of activated carbon, prolong the service life of activated carbon, and reduce the cost of activated carbon adsorption and disposal of VOCs waste gas. [0003] At present, the regeneration method of saturated activated carbon widely used in the industry is the normal pressure therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01D53/02
CPCB01J20/3416B01J20/3483B01D53/02B01D2257/708Y02A50/20
Inventor 党小庆董浩云敬开锐马红周王琪刘霞李育孙鲁强李世杰于欣
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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