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Method for absorbing and catalytically oxidizing halogenated hydrocarbons by using metal elementary substances and/or metal oxides

A metal elemental, catalytic oxidation technology, applied in the treatment of low-boiling halogenated hydrocarbons, the use of metal elemental substances and/or metal oxides to absorb and catalyze the oxidation of halogenated hydrocarbons, the field of halogenated hydrocarbons, can solve the difficulty of handling halogen elements Large, low absorption and adsorption rate, secondary pollution and other problems, to achieve the effect of simple and feasible process, simple treatment method and simple preparation method

Active Publication Date: 2020-03-27
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to achieve the above-mentioned purpose, the present invention aims at the problems of difficulty in handling halogen elements, low absorption and adsorption rate, and secondary pollution in the existing low-boiling-point halogenated hydrocarbon treatment process.

Method used

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Examples

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Effect test

Embodiment 1

[0032] A method for absorbing and catalytically oxidizing halogenated hydrocarbons by using metal elemental substance:

[0033] Step 1. Select metal elemental Fe to prepare a powdery treatment agent by mechanical grinding, pass through a 60-mesh sieve after treatment, and the particle size is below 0.25 mm;

[0034] Step 2, absorption process: the prepared Fe elemental powder treatment agent is placed in the treatment device, the treatment device in this embodiment is a fixed bed, and the powder treatment agent is placed on one end of the quartz wool in the fixed bed to ensure the contact effect , 200 ℃ constant temperature of 10ml / min into the fixed bed into the middle of the monochloromethane gas mixed with a certain amount of water vapor, the humidity of the low boiling point halogenated hydrocarbon gas monochloromethane is 31%, the halogenated hydrocarbon gas monochloromethane The mass ratio of methane and treatment agent is 1:2. The concentration of monochloromethane is ...

Embodiment 2

[0041] A method utilizing metal oxides to absorb and catalyze the oxidation of halogenated hydrocarbons:

[0042] Step 1, select metal oxide Al 2 o 3 Prepare the powder treatment agent by mechanical grinding, pass through a 60-mesh sieve after treatment, and ensure that the particle size is below 0.25mm;

[0043] Step 2, absorption process: the prepared Al 2 o 3 The powder treatment agent is placed in the treatment device. The treatment device in this embodiment is a fixed bed. The powder treatment agent is placed on one end of the quartz wool to ensure the contact effect, and the speed of 10ml / min at a constant temperature of 40°C is passed into the fixed bed. Chloromethane gas mixed with a certain amount of water vapor, the humidity of the low-boiling halogenated hydrocarbon gas monochloromethane introduced is 60%, and the mass ratio of halogenated hydrocarbon gas monochloromethane to the treatment agent is 1:7. The concentration of monochloromethane is 230ppm, wherein t...

Embodiment 3

[0050] A method for absorbing and catalytically oxidizing halogenated hydrocarbons by using metal element and metal oxide:

[0051] Step 1. Select metal elemental Fe and its oxide Fe 2 o 3 The mixture is mechanically ground to prepare a powder treatment agent, and after treatment, it passes through a 60-mesh sieve, and the particle size is below 0.25mm.

[0052] Step 2. Place the prepared mixed powder treatment agent in the processing device, which is a fixed bed. The powder treatment agent needs to be placed on one end of the quartz wool to ensure the contact effect. The monochloromethane gas mixed with a certain amount of water vapor is introduced into the fixed bed, the humidity of the low-boiling halogenated hydrocarbon gas monochloromethane introduced is 50%, and the mass ratio of the halogenated hydrocarbon gas monochloromethane to the treatment agent is 1: 12. The concentration of monochloromethane is 500ppm, wherein the reaction carried out is:

[0053] Process one...

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Abstract

The invention relates to a method for absorbing and catalytically oxidizing halogenated hydrocarbons by using metal elementary substances and / or metal oxides, which comprises the following steps: (1)preparation of a treatment agent, the treatment agent being selected from metal elementary substances, metal oxides or mixtures of metal elementary substances and metal oxides; (2) an absorption process, namely, putting the treatment agent obtained in the step (1) into a treatment device, and introducing a low-boiling-point halogenated hydrocarbon gas CH3(CH2)nX into the treatment device for reaction; and (3) a catalytic oxidation process, namely, after the low-boiling-point halogenated hydrocarbon gas CH3(CH2)nX is absorbed by the treating agent, enabling a secondary pollutant (CH3)n generated to be subjected to catalytic oxidation by the treating agent to obtain CO2 and H2O. The preparation method is simple, halogenated hydrocarbons can be efficiently degraded, and the degradation rate of halogenated hydrocarbons can reach 85.42%. Meanwhile, the halogen element can be captured, and the problem of secondary environmental pollution of the halogen element easily caused by using other methods is avoided.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to the processing technology of halogenated hydrocarbons, especially the processing technology of low-boiling point halogenated hydrocarbons, specifically a method for absorbing and catalytically oxidizing halogenated hydrocarbons by using metal element and / or metal oxide. Background technique [0002] With the development of society and economy, air pollution has intensified, and volatile organic compounds have caused serious damage to the socio-economic environment and the health of residents, some of which are volatile halogenated hydrocarbons. Volatile halogenated hydrocarbons mainly include fluorocarbons, chlorinated hydrocarbons, brominated hydrocarbons and iodohydrocarbons. Volatile halogenated hydrocarbons have strong photochemical reactivity in the atmosphere, and can become organic pollutants of secondary pollution such as ozone, and can also generate aerosol organic ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/75B01D53/70
CPCB01D53/8662B01D53/70B01D53/75B01D2257/206B01D2257/708B01D2255/20738B01D2256/16B01D2256/22
Inventor 俞磊王彦杰段二红楚培齐张亦媛柏梦圆廖中华
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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