Novel regeneration method for VOC (volatile organic compound) adsorbent

A technology of volatile organic and organic adsorbents, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of high light-off temperature of transition metal catalysts, low light-off temperature of precious metals, and easy scrapping of activated carbon adsorbents, etc. problems, to achieve the effect of being conducive to circular economy and solid waste management and disposal, reducing equipment investment costs, and realizing green and safe discharge

Active Publication Date: 2018-11-06
SHANGHAI UNIV
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Problems solved by technology

[0005] Therefore, there is an urgent need to find a new technology to solve the multiple contradictions in the current concentration-combustion process, including the low light-off temperature of noble metals-expensive contradictions, the high light-off tempe

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  • Novel regeneration method for VOC (volatile organic compound) adsorbent

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Example Embodiment

[0019] The embodiments of the present invention are detailed as follows:

[0020] See figure 1 In this embodiment, parallel double-column tower reactors (A and B) are used as the adsorbent regeneration device, and the activated carbon adsorbent is layered in the tower. Take an industrial flue gas as the regeneration gas as an example, the regeneration gas volume is 3000-7000 m 3 / h; The regeneration gas passes through the dust removal device; the temperature after dust removal is 280-300℃, and the regeneration gas contains 5000 ppm NOx, 5000 ppm CO and 5000 ppm SOx. The method steps of VOCs adsorbent regeneration are as follows:

[0021] a. Open valve 1, pass VOCs into tower A that has been filled with adsorbent, and open valve 5 to discharge the gas. After tower A reaches adsorption saturation, close valves 1 and 5, then open valve 7 to pass regeneration gas into tower A, and turn on the heater to keep the adsorbent temperature between 200-300°C, while opening valve 3 to make A...

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Abstract

The invention provides a novel regeneration method for a VOC (volatile organic compound) adsorbent, and belongs to the new technical field of control of atmospheric pollutants. Industrial waste gas containing NOx, SOx and CO is taken as regeneration gas, and regeneration of the adsorbent with saturated adsorption of VOCs is completed at lower temperature. According to the reaction mechanism, the VOCs are adsorbed on the adsorbent, content of functional groups on the adsorbent surface is increased by 50%-200%, the reduction effect of the adsorbent is enhanced, then the regeneration gas is introduced, a reaction is performed to enable the VOCs to be mineralized into CO2, so that the purpose of adsorbent regeneration is achieved, and the regeneration gas can be recycled for adsorbent regeneration. Specific surface area loss amount of the adsorbent regenerated with the method is smaller than 0.05%; average pore size reduction amount is smaller than 0.3%; mass loss amount of the adsorbent is smaller than 0.1%, and the discharged industrial waste gas meets the green emission standards, and the process is a novel, simple and efficient method for regenerating the VOC adsorbent.

Description

technical field [0001] The invention relates to a novel regeneration method for a volatile organic pollutant (VOCs) adsorbent, which belongs to the field of new technologies for controlling air pollutants. Background technique [0002] Volatile organic compounds (VOCs) are a general term for a class of organic compounds with a melting point lower than room temperature and a boiling point lower than 50-260°C under standard atmospheric pressure, mainly including alkanes, hydrocarbons, esters, alcohols, benzene series, etc. . It is one of the important precursors of photochemical smog and PM2.5. In recent years, smog incidents have occurred frequently, which has made VOCs monitoring and governance a national priority. In response to the huge demand for VOCs treatment, various technologies have been born, including adsorption, condensation, biological, plasma and combustion. However, as an industrial source that accounts for 55.5% of man-made VOCs emission sources, it has the...

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Application Information

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IPC IPC(8): B01J20/34B01D53/04
CPCB01D53/04B01J20/3408B01J20/3416B01J20/3483B01D2253/102B01D2253/108B01D2253/11B01D2259/4009B01D2259/40088B01D2257/708Y02A50/20
Inventor 张佳殷瑞黄文忠花慧张伟业周吉峙钱光人
Owner SHANGHAI UNIV
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