JP2007061594A5 - - Google Patents

Description

That is, the present invention is as follows.
1) A decomposition treatment method for decomposing an organic halogen compound filled or stored in a container, wherein the organic halogen compound is transferred to a reaction vessel, mixed with a hydrogen donor and an alkali compound in the reaction vessel, While circulating the mixed liquid through the catalyst filling device installed in the microwave irradiation apparatus, microwave irradiation is performed as necessary to decompose the organic halogen compound, and the mixed liquid after circulation is circulated by returning it to the reaction vessel. cracking process organohalogen after compound was below a predetermined concentration, an organic halogen compound, characterized in that transferring the mixture was discharged process liquid vessel in the reaction vessel in the reaction vessel Te,
2) A decomposition treatment method for decomposing an organic halogen compound filled or stored in a container, wherein the organic halogen compound is transferred to a reaction vessel, mixed with a hydrogen donor and an alkali compound in the reaction vessel, While circulating the mixed solution through a catalyst filling device installed in a reaction vessel adjacent to the microwave device, microwave irradiation is performed as necessary to decompose the organic halogen compound, and the mixed solution after distribution is returned to the reaction vessel. The organic halogen compound in the reaction tank is circulated to a predetermined concentration or less, and then the mixed liquid in the reaction tank is discharged and transferred to the treatment liquid tank,
3) The hydrogen donor is at least one compound selected from the group consisting of a heterocyclic compound, an amine compound, an alcohol compound, a ketone compound and an alicyclic compound, as described in 1) or 2) above. Decomposition method of organohalogen compounds of
4) The decomposition of the organic halogen compound according to any one of 1) to 3), wherein the alkali compound is at least one compound selected from the group consisting of caustic soda, caustic potash, sodium alkoxide, potassium alkoxide, and calcium hydroxide. Processing method,
5) The catalyst according to any one of 1) to 4), wherein the catalyst is at least one compound selected from the group consisting of a carbon crystal compound, a metal-supported carbon compound, a metal-supported oxide, and a metal-supported composite oxide. Organic halogen compound decomposition method,
6) The organic halogen compound decomposition treatment method according to any one of 1) to 5), wherein the container is a pole transformer, a large transformer, a ballast, or an OF cable oil tank,
7) The organic halogen compound decomposition treatment method according to any one of 1) to 6), wherein microwave irradiation is intermittently performed;
8) The organic halogen compound decomposition treatment method according to any one of 1) to 7), wherein the organic halogen compound filled or stored in the container is a high-concentration organic halogen compound,
9) in the 1) to 8) or in the container after the decomposition organohalogen compound treatment and subjected to physical transport of the organohalogen compounds described in, adding hydrogen donor and an alkali compound, after mixing, the mixture The organic halogen compound is decomposed by irradiating microwaves as necessary while circulating the catalyst in a catalyst filling apparatus installed in a microwave irradiation apparatus or in a reaction vessel adjacent to the microwave apparatus, and the mixed liquid after distribution is The organic halogen compound decomposition treatment method, wherein the organic halogen compound is circulated by returning it to the container so that the organic halogen compound in the container has a predetermined concentration or less, and then the mixed liquid in the container is discharged and transferred to the treatment liquid tank,
10) A decomposition treatment system for decomposing organic halogen compounds filled or stored in a container, comprising a reaction vessel, a microwave irradiation device for irradiating microwaves, and in the microwave device or adjacent to the microwave device A catalyst filling apparatus that can be installed in the reaction tank, a supply means for supplying the catalyst filling apparatus with the solution in the reaction tank, a transfer means for transferring the solution in the reaction tank to the treatment liquid tank, A mobile decomposition treatment system characterized by comprising at least a treatment liquid tank for storing the solution in the reaction tank, and
11) The decomposition processing system according to 10), wherein the container is a pole transformer, a large transformer, a ballast, or an OF cable oil tank.

A decomposition processing method and a decomposition processing system of the present invention are decomposition methods for decomposing an organic halogen compound filled or stored in a container, and a mobile processing device is installed at a processing place for oil composed of an organic halogen compound. Installed, transferred the organic halogen compound to a reaction vessel, mixed with a hydrogen donor and an alkali compound in the reaction vessel, and then installed the mixed solution in a microwave irradiation device or a reaction vessel adjacent to the microwave device The organic halogen compound is decomposed by irradiating microwaves as necessary while circulating through the catalyst filling apparatus, and the mixed liquid after circulation is circulated by returning it to the reaction tank so that the organic halogen compound in the reaction tank is predetermined. Then, the mixed solution in the reaction vessel is discharged and transferred to the treatment solution vessel. In order to accelerate the decomposition process of the organic halogen compound, a hydrogen donor and an alkali compound are mixed with the oil.

FIG. 1 is a schematic view showing an embodiment of the decomposition processing system of the present invention, and shows an example of decomposition processing of PCB oil filled in a high concentration PCB device 10. As shown in FIG. 1, in the decomposition treatment system 1 of the present invention, a reaction tank 20 for preparing a mixed liquid (hereinafter referred to as “liquid to be treated”) obtained by mixing PCB oil, a hydrogen donor, and an alkali compound. , A microwave irradiation device 30 that irradiates microwaves, a catalyst filling device 35 that can be installed in the microwave irradiation device, a supply means (circulation pump) 21 that supplies the catalyst filling device with a solution in the reaction vessel, The processing liquid tank 40 and a transfer means (dispensing pump) 31 for transferring the solution in the reaction tank to the processing liquid tank are configured as main components.

The catalyst filling device is not particularly limited in its shape, size, and installation location in the microwave irradiation device, and may be installed in a position where microwave irradiation is possible. The catalyst filling device may be a detachable cassette type.

Since the catalyst filling device 35 is installed in the microwave irradiation device 30, microwave irradiation can be performed as necessary. When the microwave device is turned on, the liquid to be treated flowing through the catalyst layer comes into contact with the catalyst heated by the irradiated microwave. Thus, since the liquid to be treated flowing through the catalyst layer comes into contact with the catalyst activated by microwaves, the organic halogen compound in the liquid to be treated decomposes at a much faster rate than when it is brought into contact in an unheated state. To do. On the other hand, when the microwave device is turned off, the liquid to be treated flowing through the catalyst layer comes into contact with the catalyst at room temperature. Thus, the organic halogen compound in the liquid to be treated is gradually decomposed at a relatively low rate.

In FIG. 1, the embodiment in which the catalyst filling device 35 is installed in the microwave irradiation device 30 and decomposed is described. This catalyst filling device 35 can also be installed in the reaction vessel 20 (see FIG. 4), and has an advantage that the amount of catalyst to be filled is less restricted than when installed in the microwave irradiation device.

On the other hand, a catalyst (average particle diameter of about 1 mm) in which 5% palladium (Pd) was supported on granular activated carbon (trade name: Diahop 008) was prepared and dried at 70 ° C. for 8 hours. 24 g of this catalyst was placed in a catalyst filling device installed in a microwave irradiation device, and the upper and lower sides were sandwiched between 100 mesh screens to fill the catalyst. While stirring the inside of the reaction vessel with a magnetic stirrer, the mixed solution in the reaction vessel was extracted with a pump and continuously circulated at a rate of 10 ml / min through the catalyst filling apparatus equipped with an optical fiber thermometer. The sample was returned and circulated at room temperature for a predetermined time shown in Table 1. During that time, during the time shown in Table 1, microwaves with a frequency of 2.45 GHz and a maximum output of 650 W were continuously irradiated while being electrically controlled, and the reaction temperature was maintained at 60 ° C. Nitrogen gas was allowed to flow at 50 ml / min during the reaction.

Example 4
FIG. 7 shows a schematic diagram of the decomposition processing apparatus used in this embodiment. Established the NakadachiTakashi Hama device 35 touch the larger microwave irradiation device 30 in parallel 3 group, it circulates the liquid in the reaction vessel 20 by the circulating pump 21.

On the other hand, a catalyst (average particle size of about 1 mm) in which 5% palladium (Pd) was supported on granular activated carbon (trade name: Diahop 008) was prepared and dried at 60 ° C. for 24 hours or more. 750 g of this catalyst was placed in a catalyst packed bed installed in a microwave irradiation apparatus, and the catalyst was packed. While stirring the reaction vessel with a stirrer, the mixed solution in the reaction vessel was extracted with a pump, continuously passed through the catalyst packed bed equipped with an optical fiber thermometer at a rate of 80 ml / min, and then returned to the reaction vessel. Circulation was performed at normal pressure. When the PCB concentration in the mixed solution did not fall below the target of 0.5 ppm, the operation of returning the mixed solution to the reaction tank after circulating and circulating the mixed solution through the catalyst packed bed was repeated. Meanwhile, for 8 hours in the daytime, microwaves with a frequency of 2.45 GHz and a maximum output of 650 W are continuously controlled while being electrically controlled to maintain the reaction temperature at 60 ° C. Stopped. During the reaction, nitrogen gas was allowed to flow at 300 ml / min.

DESCRIPTION OF SYMBOLS 1 Decomposition processing system 10 High concentration PCB apparatus 11 Transfer means (pump)
20 Reaction tank 21 Transfer means (circulation pump)
30 Microwave irradiation device 31 Transfer means (dispensing pump)
35 Catalyst filling device 40 Treatment liquid tank 50 Microwave oscillator

Claims (11)

A decomposition treatment method for decomposing an organic halogen compound filled or stored in a container, wherein the organic halogen compound is transferred to a reaction vessel and mixed with a hydrogen donor and an alkali compound in the reaction vessel, and then the mixed solution the using microwave radiation to decompose the organic halogen compounds optionally while flowing to a catalyst loading unit installed in the microwave irradiation in the apparatus, and a mixed liquid after flow is circulated by returning to the reactor the reaction A method for decomposing an organic halogen compound, comprising: reducing an organic halogen compound in a tank to a predetermined concentration or less; and discharging a mixed liquid in the reaction tank and transferring the mixture to a processing liquid tank.
Reasoning method. A decomposition treatment method for decomposing an organic halogen compound filled or stored in a container, wherein the organic halogen compound is transferred to a reaction vessel and mixed with a hydrogen donor and an alkali compound in the reaction vessel, and then the mixed solution By irradiating microwaves as necessary while circulating through a catalyst filling device installed in a reaction vessel adjacent to the microwave device, decomposing the organic halogen compound, and returning the mixed solution after circulation to the reaction vessel A method for decomposing an organic halogen compound, comprising circulating the organic halogen compound in a reaction tank to a predetermined concentration or less and then discharging the mixed liquid in the reaction tank and transferring it to a treatment liquid tank.   The organic halogen according to claim 1 or 2, wherein the hydrogen donor is at least one compound selected from the group consisting of a heterocyclic compound, an amine compound, an alcohol compound, a ketone compound, and an alicyclic compound. Compound decomposition method.   The method for decomposing an organic halogen compound according to claim 1, wherein the alkali compound is at least one compound selected from the group consisting of caustic soda, caustic potash, sodium alkoxide, potassium alkoxide, and calcium hydroxide.   The organohalogen compound according to any one of claims 1 to 4, wherein the catalyst is at least one compound selected from the group consisting of a carbon crystal compound, a metal-supported carbon compound, a metal-supported oxide, and a metal-supported composite oxide. Decomposition method.   The method for decomposing an organic halogen compound according to any one of claims 1 to 5, wherein the container is a pole transformer, a large transformer, a ballast, or an OF cable oil tank.   The method for decomposing an organic halogen compound according to any one of claims 1 to 6, wherein microwaves are irradiated intermittently.   The organic halogen compound decomposition treatment method according to claim 1, wherein the organic halogen compound filled or stored in the container is a high-concentration organic halogen compound. Into the container after the decomposition organohalogen compound treatment and subjected to physical transport of the organohalogen compound according to any one of claims 1 to 8, adding a hydrogen donor and an alkali compound, after mixing, microwave the mixture While circulating through a catalyst filling device installed in an irradiation device or in a reaction vessel adjacent to the microwave device, microwaves are irradiated as necessary to decompose the organic halogen compound, and the mixed liquid after distribution is returned to the container. The organic halogen compound decomposition treatment method is characterized in that the organic halogen compound in the container is reduced to a predetermined concentration or less by being circulated, and then the mixed liquid in the container is discharged and transferred to a treatment liquid tank. A decomposition treatment system for decomposing organic halogen compounds filled or stored in a container, which is adjacent to a reaction tank, a microwave irradiation device for irradiating microwaves, or in or adjacent to the microwave irradiation device a catalyst loading apparatus can be installed in the reaction vessel, and supply means for supplying a solution or the like of the reaction vessel to the catalyst filling device, a transfer means for transferring the solution or the like of the reaction tank in the processing liquid tank, the A mobile decomposition processing system comprising at least a processing liquid tank for storing a solution or the like in a reaction tank.   The decomposition processing system according to claim 10, wherein the container is a pole transformer, a large transformer, a ballast, or an OF cable oil tank.