Method and apparatus for dehalogenating organic halide through electrolysis

Abstract

An object is to provide a method for completely and fully dehalogenating an organic halide through electrolysis, and an electrolysis apparatus used therefor. One embodiment of the invention is a method wherein, when carrying out dehalogenation by electrolyzing an organic halide or a liquid containing the organic halide, a diaphragm electrolytic cell in which an anode and a cathode are separated is used, and electrolysis is carried out while applying ultrasonic waves using ultrasonic wave generating means and stirring using stirring means, and an electrolytic cell used therefor. Another embodiment of the present invention is a method wherein, when carrying out electrolysis, a hydrogen-absorbing metal or alloy is used as a cathode. In this case also, it is preferable to further use a diaphragm electrolytic cell, and carry out electrolysis using ultrasonic wave generating means and stirring means.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for dehalogenating an organic halide through electrolysis so as to render it harmless, and apparatus used therefor. BACKGROUND ART [0002] Organic halides such as polychlorinated biphenyls (PCBs) or dioxins are generally harmful to the human body, and many thereof pollute the environment. In particular, PCBs cause a serious social problem as an environmental pollutant since they are resistant to degradation, remain for a long period of time without decomposing, and continue to pollute the surroundings. Furthermore, PCBs also have the problem that it is difficult to process them so as to render them harmless when they are disposed of, etc. since they are chemically very stable substances. [0003] With regard to methods that are currently allowed by the Waste Disposal Law regulating the disposal of waste oil, etc. containing PCBs, there are known a high temperature thermal decomposition method, a dechlorinating decompositi...

AI Technical Summary

Benefits of technology

[0006] The present inventors have also proposed a method in which a PCB and a solvent such as water or acetonitrile are mixed, and the PCB is treated by electrolysis (ref. Patent Publication 5 below). This method is an excellent method since the PCB, etc. can be made harmless relatively simply. However, in order to carry out dehalogenation completely by this method, it is necessary to modify the conditions and equipment for the electrolysis.

Problems solved by technology

Organic halides such as polychlorinated biphenyls (PCBs) or dioxins are generally harmful to the human body, and many thereof pollute the environment.

In particular, PCBs cause a serious social problem as an environmental pollutant since they are resistant to degradation, remain for a long period of time without decomposing, and continue to pollute the surroundings.

Furthermore, PCBs also have the problem that it is difficult to process them so as to render them harmless when they are disposed of, etc. since they are chemically very stable substances.

However, there are the defects and problems that the metal and catalyst used in the dehalogenating decomposition are expensive and it is necessary to carry out this chemical reaction in an anhydrous organic solvent.

However, this method also has the problem that it is necessary to use an organic solvent.

However, in order to carry out dehalogenation completely by this method, it is necessary to modify the conditions and equipment for the electrolysis.

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