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Method for removing volatile halocarbons in environment through chemical conversion

A chemical conversion, halogenated hydrocarbon technology, applied in the field of environmental engineering, can solve the problems of ineffective contact of pollutants, slow oxidation reaction, inability to carry current, etc., to achieve no secondary pollution, short repair period, and complete conversion. Effect

Active Publication Date: 2014-11-19
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But using KMnO 4 When oxidizing groundwater contaminated by chlorinated hydrocarbons, in KMnO 4 Oxidation process will produce MnO which is insoluble in water 2 By-products, the pores of the underground environment are blocked, making the groundwater flow unable to carry the KMnO 4 solution, resulting in KMnO 4 Ineffective contact with pollutants, thus slowing down the oxidation reaction

Method used

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  • Method for removing volatile halocarbons in environment through chemical conversion
  • Method for removing volatile halocarbons in environment through chemical conversion
  • Method for removing volatile halocarbons in environment through chemical conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Metal oxides to CCl at different temperatures 4 The removal effect of

[0046] metal oxide (Al 2 o 3 , SnO 2 、TiO 2 etc.) Activate in a muffle furnace at 500°C for 4h, take 0.8g and put it into a fixed bed reactor, and feed 1010ppm of CCl 4 / N 2 Gas, gas flow rate 37.7ml / min, heating reaction at 200℃~400℃, CCl at different temperatures 4 The conversion rate is shown in Table 1.

[0047] Table 1 Metal oxides to CCl at different temperatures 4 The removal effect of

[0048]

Embodiment 2

[0050] Composite metal oxides to CCl 4 The removal effect of

[0051] Mixed metal metal oxide Al 2 o 3 ·SnO 2 and Al 2 o 3 2SnO 2 Activate in a muffle furnace at 500°C for 4h, take 0.8g into a fixed bed reactor, and feed 1010ppm of CCl 4 / N 2 Gas, gas flow rate 37.7ml / min, heating reaction at 150℃~350℃, CCl at different temperatures 4 The conversion rate is shown in Table 2.

[0052] Table 2 Composite metal oxides to CCl 4 The removal effect of

[0053]

Embodiment 3

[0055] Type A molecular sieve to CCl 4 The removal effect of

[0056] Activate type A molecular sieves (type 3A, type 4A, type 5A) in a muffle furnace at 500°C for 4h, take 0.8g and put it into a fixed bed reactor, and feed 1010ppm of CCl 4 / N 2 Gas, gas flow rate 37.7ml / min, heating reaction at 150℃~300℃, CCl at different temperatures 4 The conversion rate is shown in Table 3.

[0057] Table 3 Type A molecular sieve to CCl 4 The removal effect of

[0058]

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Abstract

The invention relates to a method for removing volatile halocarbons in environment through chemical conversion, and belongs to the technical field of environmental engineering. Gas or liquid containing the volatile halocarbons reacts with a dehalogenation agent under the heating condition, and the volatile halocarbons in the environment are removed. The method is specially characterized in that the gas or the liquid containing the volatile halocarbons is led into a dehalogenation agent bed layer after drying pretreatment, the halocarbons and the dehalogenation agent react at the temperature of 150 DEG C to 700 DEG C to generate CO2, H2O, gaseous metal halides and the like, generated gaseous substances are blown through carrier gas to flow out of the bed layer, the gaseous substances pass through an absorption cell to be absorbed and treated, exhausted tail gas does not contain toxic substances, and the halocarbons do not exist in residue in the bed layer. At the low reaction temperature, the method can completely remove the halocarbons used for reaction. Compared with traditional methods of physical absorption, high-temperature burning, metal reduction and the like, the method has the advantages of being short in repairing period, thorough in conversion, free of generating secondary pollution and the like.

Description

technical field [0001] The invention relates to a method for removing volatile halogenated hydrocarbons, in particular to a method for chemically transforming and removing volatile halogenated hydrocarbons in the environment, belonging to the field of environmental engineering. Background technique [0002] Volatile halogenated hydrocarbons have the characteristics of high density, low boiling point, low viscosity, and insoluble in water. They are widely used in chemical, pharmaceutical, leather, electronics, dry cleaning and other fields. Unwholesomeness can easily enter the environment. Exposure to these substances in the environment is extremely harmful to the human body and the environment. Many of these compounds are easily absorbed by the skin and mucous membranes due to their volatility, or are passed through the food chain and finally enriched in the human body, causing serious damage to the human body. A variety of volatile halogenated hydrocarbons are considered t...

Claims

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Application Information

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IPC IPC(8): A62D3/30B09C1/08A62D101/22
Inventor 李森周玉强姜达强商照聪罗勇吴向阳
Owner SHANGHAI RES INST OF CHEM IND
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