Method for treating coating waste gas by manganese-loaded expanded graphite adsorption coupled catalytic ozonation

A technology of expanded graphite and ozone oxidation, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve problems such as incomplete degradation of VOCs, improve oxidation reaction efficiency and ozone utilization, improve degradation efficiency, and improve adsorption. effect of action

Inactive Publication Date: 2020-04-28
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the incomplete problem of the degradation of VOCs in the coating exhaust gas by wet washing and separate ozone oxidation technology

Method used

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  • Method for treating coating waste gas by manganese-loaded expanded graphite adsorption coupled catalytic ozonation

Examples

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Effect test

Embodiment 1

[0028] Example 1: Purification treatment of exhaust gas in automobile steel plate coating workshop

[0029] Purify the exhaust gas produced in the automobile steel plate coating workshop. The raw materials used for coating are solvent-based coatings, water-based coatings and UV coatings. The main components of VOCs in the exhaust gas are benzene, toluene, xylene; butynol, butanol, Isobutanol; acetone, methyl ethyl ketone, the concentration of VOCs is 350mg / L, and the air volume is 800m 3 / h.

[0030] The preparation method of manganese-loaded expanded graphite adsorbent and catalyst is carried out according to the following steps: at room temperature, perchloric acid and concentrated phosphoric acid are mixed with a mass ratio of 4:1, and then natural Lumpy graphite (composition by mass percentage is C: 88%, O: 5%, S: 2%, and the rest 5%) and potassium permanganate (massive graphite is mixed with perchloric acid, concentrated phosphoric acid and permanganese respectively Pot...

Embodiment 2

[0032] Example 2: Purification treatment of exhaust gas produced in aluminum plate coating workshop

[0033] Purify the waste gas produced in the aluminum plate painting workshop. The paints used for painting are polyurethane paint, acrylic paint and water-based epoxy paint. The main components of VOCs in the waste gas are xylene, cyclohexanone, styrene, acetone, Butanone, glycol ether and its esters and dipropylene glycol diacrylate, etc., the concentration of VOCs is 400mg / L, and the air volume is 1000m 3 / h.

[0034] The preparation method of manganese-loaded expanded graphite adsorbent and catalyst is carried out according to the following steps: at room temperature, perchloric acid and concentrated phosphoric acid are mixed with a mass ratio of 4:1, and then natural Flake graphite (composition by mass percentage is C: 90%, O: 4%, N and S: 2%, Si: 1%, and the rest 3%) and potassium permanganate (natural flake graphite is mixed with perchloric acid respectively , concentrat...

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Abstract

The invention discloses a method for treating coating waste gas by manganese-loaded expanded graphite adsorption coupled catalytic ozonation, and is characterized in that the coating waste gas is introduced into a wet oxidation spray washing tower taking the manganese-loaded expanded graphite as a filler; ozone is introduced at the same time, adsorbing and catalyzing are carried out on the ozone to oxidize VOCs by utilizing manganese-loaded expanded graphite to mineralize the VOCs into carbon dioxide and water, and particles in the waste gas are removed by utilizing the washing and agglomeration effects of spray water which is used for dissolving the ozone and has chemical oxidation activity; then the waste gas enters a demisting purification tower of a manganese-loaded expanded graphite packing layer to remove fog drops brought out of a spray washing tower, the VOCs removal rate is further increased through the adsorption and catalytic oxidation effects of manganese-loaded expanded graphite, and finally the waste gas is discharged through a discharge tower. The removal rate of VOCs reaches 98% or above, the removal rate of particles reaches 99.5% or above, and secondary pollutionis avoided. The manganese-loaded expanded graphite is stable in adsorption and catalytic performance and can be used for a long time.

Description

technical field [0001] The invention relates to a manganese-loaded expanded graphite adsorption coupled catalytic ozone oxidation treatment of coating waste gas and an in-situ regeneration method thereof, belonging to the technical field of coating waste gas treatment. Background technique [0002] Industries such as metal processing, building material production, and machinery and equipment manufacturing generally have painting processes, which generate a large amount of painting waste gas and become an important source of air pollution. Therefore, it is necessary to adopt a reasonable technical solution to purify the exhaust gas from painting to reduce its damage to the atmospheric environment. [0003] The composition of painting exhaust gas is extremely complex, not only benzene, toluene, xylene and other benzene series, dust, paint slag and other solid particles, most of the painting exhaust gas also contains ethyl acetate, butanone, isopropanol, ethers and other organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/78B01D53/44
CPCB01D53/04B01D53/78B01D53/8687B01D2251/104B01D2257/708B01J23/34B01J35/1004Y02A50/20
Inventor 陈泉源胡卓祺杜夕铭黄昭露卢钧姚远刘晓琛
Owner DONGHUA UNIV
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