JP3416751B2 - Detoxification of organic chlorine compounds - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detoxifying an organic chlorine compound. Specifically, the present invention converts PBC used as an insulating material, organic chlorine compounds such as trichloroethylene used as an organic solvent, and dioxins generated during the operation of a refuse incinerator such as vinyl chloride into safe inorganic compounds. To a method for detoxifying organic chlorine compounds. [0002] These organochlorine compounds are currently stored in containers because their safe treatment technology has not been established. Although these compounds have been stored in containers for long periods of time, corrosion of the containers has begun and there is a risk of environmental pollution. In addition, while organic chlorine compounds have been used as solvents for a long period of time, contamination of soil and groundwater has become a problem. If a treatment method for these harmful substances is established, it is expected that the problem of pollution will be resolved. [0003] A method of directly incinerating organic chlorine compounds such as PBC and trichloroethylene is currently under development, and the actual treatment of these organic chlorine compounds has not been performed yet. In order to control the generation of dioxins generated when incinerating organochlorine compounds in conventional refuse incinerators, the combustion conditions have been well understood, and the technology for collecting the generated dioxins has been considerably advanced. There are no collections, so they remain in storage. [0004] Conventionally, techniques for combusting organochlorine compounds in air have been developed. This method generates hydrogen chloride and chlorine gas which are highly corrosive at the time of combustion, and also generates high temperatures, so that the furnace material is significantly corroded and has not been practically treated. An object of the present invention is to react copper in an organic chlorine compound with copper in copper oxide to produce copper chloride, while converting the organic chlorine compound into a harmless compound. It is to provide a way to change it. Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve this object. As a result, the organochlorine compound was heated to 400 to 500 ° C. in an inert atmosphere or a low-oxygen atmosphere to produce the organochlorine compound. The present invention has led to the invention of a method for detoxifying an organic chlorine compound, which comprises vaporizing a compound and reacting a gaseous organic chlorine compound with copper oxide at a temperature of 750 to 800 ° C. to dechlorinate the organic chlorine compound. Was. In the method of the present invention, a predetermined amount of an organic chlorine compound is continuously supplied to a heat medium in an inert atmosphere. Since the heat medium is heated to 400 to 500 ° C., most of the organic chlorine compounds become gas. As a heating medium,
Use corrosion-resistant alumina, river sand, etc. for chlorine. The gaseous organic chlorine compound is subjected to a dechlorination reaction by being accompanied by an inert gas in a dechlorination reaction apparatus heated to 750 to 800 ° C. in advance. [0008] Since this reaction is carried out in an inert atmosphere or under a low oxygen partial pressure, the heat of combustion of the organic matter is small and the corrosion of the furnace material can be suppressed. Chlorine reacts with copper to produce gaseous copper chloride, which is recovered and reused through a scrubber. After passing the activated carbon through the exhaust gas, the exhaust gas is circulated through a heat medium using a blower. By using a circulating device, it is possible to prevent leakage of highly toxic dangerous substances and to effectively use inert gas and heat. The present invention will be specifically described with reference to examples. FIG. 1 shows a fluidized bed reactor used for improvement of soil contaminated with organochlorine compounds. The fluidized bed 2 is heated to about 500 ° C. by a microwave heater. River sand was used as a fluid medium and fluidized with argon gas. The dechlorination reactor 3 uses an electric heater for about 80
Heated to 0 ° C. Next, the simulated contamination sample was introduced into the fluidized bed 2 from the hopper 1 using a screw feeder at about 0.5 kg /
h. The organic chlorine compound is vaporized in the fluidized bed 2 and forms copper chloride in the dechlorination reactor 3 in which copper oxide is installed. The copper chloride was collected by the scrubber 4 and recovered as copper hydroxide. The exhaust gas passed through the activated carbon gas purification tower 5 and was introduced into the fluidized bed 2 by the circulation blower 6. The simulated soil was taken out after confirming that chlorine was not present by a halogen monitor in the fluidized bed. An important effect of the method of the present invention is that the dechlorination reaction is carried out in an inert atmosphere, so that it does not involve intense heat of combustion of organic substances, and that the reaction heat is small, so that corrosion of furnace materials can be expected to be suppressed. Because copper chloride can be recycled and used, secondary waste is not generated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fluidized bed reactor used for improving soil contaminated with organochlorine compounds. [Description of Signs] 1 Organochlorine compound sample feeder 2 Fluidized bed 3 Dechlorination reactor 4 Scrubber 5 Activated carbon gas cleaning bed 6 Circulating blower 7 Receiver 8 Cyclone 9 Argon gas

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 53/70 A62D 3/00 B09C 1/06

Claims (1)

(57) Claims 1. An organic chlorine compound contaminated soil and an organic chlorine compound generated during the operation of a refuse incinerator are heated to 400 to 500 ° C. in an inert atmosphere or a low oxygen atmosphere. The organic chlorine compound is vaporized by the
A method for detoxifying an organic chlorine compound, which comprises reacting the organic chlorine compound with copper oxide at a temperature of 0 to 800 ° C. to dechlorinate the organic chlorine compound as copper chloride.