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Method for degrading VOCs via normal temperature catalytic oxidation

A catalytic oxidation, room temperature technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high energy consumption, easy generation of by-products, etc., and achieve the effect of a wide range of applications

Inactive Publication Date: 2018-04-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the regenerative catalytic combustion technology is widely used for the degradation of VOCs. The regenerative catalytic combustion method can achieve a better removal rate, but it often requires high temperature (generally above 300 ° C), high energy consumption, and easy to produce by-products

Method used

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  • Method for degrading VOCs via normal temperature catalytic oxidation
  • Method for degrading VOCs via normal temperature catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The nitrogen provided by the nitrogen cylinder is divided into three paths, one is through the VOCs blow-off bottle, the flow rate is controlled at 20mL / min, the other is nitrogen as a buffer gas, the flow rate is controlled at 900mL / min, and the other is through the water vapor bubbling bottle, the flow rate is controlled at 25mL / min, controlled by a mass flow meter. The methylene chloride liquid is filled in the VOCs blow-off bottle. The temperature of the water vapor bubbling bottle is controlled at 20° C.; the temperature of the VOCs blow-off bottle is controlled at 15° C. The ozone concentration that described ozone generator provides is 1000ppm, and flow control is 1000mL / min, is controlled by rotameter. The concentration of VOCs in the mixer is 800ppm.

[0031] After the ozone is mixed with the nitrogen buffer gas, it enters the mixer together with the nitrogen containing VOCs and the nitrogen containing water vapor for mixing. After the mixing is complete, it ...

Embodiment 2

[0038] The nitrogen provided by the nitrogen cylinder is divided into three paths, one is through the VOCs blow-off bottle, the flow rate is controlled at 1mL / min, the other is nitrogen as a buffer gas, the flow rate is controlled at 100mL / min, and the other is through the water vapor bubbling bottle, the flow rate is controlled at 1mL / min, controlled by a mass flow meter. Ethyl acetate liquid is filled in the described VOCs blow-off bottle. The temperature of the water vapor bubbling bottle is controlled at 0°C; the temperature of the VOCs blow-off bottle is controlled at -10°C. The ozone concentration that described ozone generator provides is 200ppm, and flow control is 100mL / min, is controlled by rotameter. The concentration of VOCs in the mixer is 100ppm.

[0039]After the ozone is mixed with the nitrogen buffer gas, it enters the mixer together with the nitrogen containing VOCs and the nitrogen containing water vapor for mixing. After the mixing is complete, it enters ...

Embodiment 3

[0046] The nitrogen provided by the nitrogen cylinder is divided into three paths, one is through the VOCs blow-off bottle, the flow rate is controlled at 30mL / min, the other is nitrogen as a buffer gas, the flow rate is controlled at 1000mL / min, and the other is through the water vapor bubbling bottle, the flow rate is controlled at 50mL / min, controlled by a mass flow meter. Fill the toluene liquid in the described VOCs blow-off bottle. The temperature of the water vapor bubbling bottle is controlled at 40°C; the temperature of the VOCs blow-off bottle is controlled at 40°C. The ozone concentration that described ozone generator provides is 2000ppm, and flow control is 2500mL / min, is controlled by rotameter. The concentration of VOCs in the mixer is 1000ppm.

[0047] After the ozone is mixed with the nitrogen buffer gas, it enters the mixer together with the nitrogen containing VOCs and the nitrogen containing water vapor for mixing. After the mixing is complete, it enters ...

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Abstract

The invention discloses a method for normal temperature catalytic oxidation of VOCs. The method comprises a gas distribution stage, a catalytic reaction stage, and a detection stage. A nitrogen steelcylinder provides three steams of nitrogen, wherein one stream passes through a VOCs-stripping bottle, one stream is taken as a cushion gas, and one stream passes through a steam bubbling bottle, andan ozone generator provides ozone. Ozone is mixed with a nitrogen cushion gas, the mixed gas together with VOCs-containing nitrogen and steam-containing nitrogen enters a mixer for mixing, after the mixing is complete, the obtained mixture enters a reactor, and after the reaction is complete, one part of the produced gas passes through gas chromatography for on-line concentration detection, and the other part of the produced gas is treated and discharged. The method allows VOCs to be effectively removed.

Description

technical field [0001] The invention relates to the application field of air pollution control, in particular to a process for catalytic oxidation degradation of VOCs at room temperature. Background technique [0002] Volatile organic compounds (VOCs) are one of the main sources of air pollution. The so-called VOCs refer to a class of compounds with a saturated vapor pressure greater than 133.3 Pa at normal temperature and a boiling point less than or equal to 260 °C at normal pressure. There are many kinds of VOCs, mainly alkanes, alkenes, alkynes, aromatics and so on. VOCs mainly come from decoration materials, adhesives, building materials, chemical and petrochemical waste gas printing industries, etc. VOCs is an important air pollutant, and its main hazards are as follows: 1) It will cause irritating effects on the human body. If the human body is exposed to high concentrations of VOCs for a long time, it is prone to lesions and even cancer; 2) Photochemical reactions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72B01D53/76
CPCB01D53/76B01D53/8668B01D2251/104B01D2255/802B01D2257/708Y02A50/20
Inventor 丁辉王路路邢中鹏王宪琴李路军赵丹
Owner TIANJIN UNIV
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