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Method for treating soil or ash contg. organohalogen compounds

A compound, organic halogen technology

Inactive Publication Date: 2002-07-24
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of the catalyst is still unsatisfactory as shown in the following comparative examples

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Embodiment 1 Iron compound particle

[0088] Use an average particle size of 0.25μm, a phosphorus content of 0.002wt%, a sulfur content of 0.05wt%, a sodium content of 0.08wt%, and a BET specific surface area of ​​85m 2 / g of ingot-shaped goethite particles as iron compound particles.

[0089] When measured by the above evaluation method, the decomposition rate of the goethite particles at a temperature of 300° C. to chlorobenzene was 32%. Production of organohalogen compound decomposition catalysts

[0090] In a Henschel mixer (nominal volume: 10 liters) operated at 1,440 rpm, 1.5 kg of the above ingot-shaped goethite particles and 75 g of triethanolamine (boiling point 360° C.) (accounting for the needle) were mixed at a temperature of 50° C. 5.0% by weight of iron ore particles) were dry-mixed together for 5 minutes, thereby obtaining goethite particles on which triethanolamine was loaded (amount of triethanolamine: 5.0% by weight of the goethite particles).

[00...

Embodiment 2-7

[0095] Composite catalysts 2-10 were prepared as organohalogen compound decomposition catalysts. In Composite Catalyst 7, silicon dioxide, which itself has no catalytic activity, was used instead of the iron compound. The different properties of the obtained composite catalysts are listed in Table 2. Composite catalyst 10 was obtained by dry mixing iron compound 7 and aniline in a Nauta mixer (rotation speed: 30 rpm, rotation speed: 2 rpm, mixing time: 5 minutes). Embodiment 2-7, the decomposition test of comparative example 1-8 and reference examples 1 and 2 dioxins

[0096]The organic halogen compounds contained in the ash or soil were subjected to the same decomposition test as defined in Example 1, except that the type of ash, the type of composite catalyst, heat treatment atmosphere, heat treatment temperature and holding time were changed.

[0097] The various test conditions and results used in the decomposition test of dioxins are shown in Table 3. In Comparative Ex...

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Abstract

A process for treating an organohalogen compound-containing soil or ash of the present invention, comprises: mixing the organohalogen compound-containing soil or ash with an organohalogen compound-decomposition catalyst composed of a composite catalyst comprising an amine compound and iron compound particles, and having an average particle size of 0.01 to 2.0 mum, a phosphorus content of not more than 0.02% by weight, a sulfur content of not more than 0.3% by weight and a sodium content of not more than 0.3% by weight; and having an apparent density (rhoa) of not more than 0.8 g / ml and a catalytic activity capable of decomposing not less than 50% by weight of monochlorobenzene; and heat-treating the obtained mixture at a temperature of 150 to 600 DEG C. The method for treating an organohalogen compound-containing soil or ash in order to effectively decompose dioxins and dioxin precursors such as aromatic organohalogen compounds or aliphatic organohalogen compounds, e.g., trichloroethylene and dichloromethane, which are contained in the soil or ash.

Description

technical field [0001] The present invention relates to a method for treating soil or ash containing organic halogen compounds, more particularly, to a method for treating soil or ash containing organic halogen compounds to effectively decompose dioxin contained in soil or ash Dioxin-like compounds or dioxin precursors such as aromatic organohalogen compounds or aliphatic organohalogen compounds such as trichlorethylene and methylene chloride. Background technique [0002] Exhaust gas, fly ash, and deposited ash from incinerators when municipal solid waste and industrial waste are burned contain dioxins, which are aromatic halogen compounds exhibiting extreme toxicity to humans, although in very small amounts . Dioxins generally include compounds having a structure in which hydrogen atoms of dibenzo-p-dioxin, fluorene, and the like are replaced by chlorine atoms. [0003] Also, aliphatic organohalogen compounds such as trichloroethylene and tetrachloroethylene have been wi...

Claims

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Application Information

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IPC IPC(8): B09C1/06A62D3/40A62D101/22A62D101/28B09B3/00B09C1/08
CPCB09B3/00A62D2101/22B09C1/08A62D3/40A62D2101/28B09C1/06
Inventor 今井知之畠山敏松井敏树藤井泰彦冲田朋子博多俊之
Owner TODA IND
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