JP2000254615A - Equipment for decomposition treatment of hardly- decomposable material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decomposition treatment equipment for a hardly-decomposable material, which is capable of enabling recycle supply of a material to be treated to secure a long residence time of the material, efficiently taking out and discharging crystallized matter formed, thereby solving problems with respect to pipeline plugging, enhancing safety of the operation and efficiently being operated without stopping the operation. SOLUTION: This equipment is provided with: a temperature elevation device (heater) 11 for heating a mixed material to be treated which is obtained by mixing a material to be subjected to decomposition treatment from a tank 1 for receiving the material, with a chemical agent for the treatment from a vessel 3 for receiving the chemical agent; a reactor 19 for subjecting the heated material which is passed through the heater 11 and then through a pipeline 16 and a pipeline 18, to reaction while maintaining the temperature of the material; a recycle pump 17 for recycling one portion of the treated material subjected to reaction in the reactor 19, to the reactor 19 through the pipelines 14 and 18; a slurry separator 22 that is connected to the recycle pump 17 through a pipeline 22 and is used for separating crystallized matter from the other portion of the treated material, which is not recycled; a cooler 25 for cooling the resulting treated material transferred from the slurry separator 22 through a pipeline 24; and a treatment vessel 28 for subjecting the cooled treated material that is transferred from the cooler 25 through a pipeline 26 and a pressure regulating valve 27, to gas-liquid separation under the atmospheric pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for decomposing hardly decomposable substances such as environmental pollutants, and more particularly to an organic chlorinated solvent such as chlorofluorocarbon and trichlene (methylene chloride, chloroform, carbon tetrachloride, etc.), dioxin, PCB and the like. The present invention relates to a decomposition treatment apparatus for decomposing a hardly decomposable organic chlorine substance of industrial waste by a solvent (chemical) reaction.

[0002]

2. Description of the Related Art Hitherto, a decomposition treatment apparatus by a solvent (chemical) reaction has been proposed and attracted attention as a treatment of a substance to be decomposed mainly composed of an industrial chlorinated solvent such as fluorocarbon and trichlene, and industrial waste such as dioxin and PCB. I have. This solvent (drug)
For example, in the case of chlorofluorocarbon treatment, the decomposition treatment apparatus for the reaction first mixes a solvent (chemical) such as caustic soda solution and methanol with the decomposition target substance in the decomposition target substance tank, and heat-exchanges this mixture via a pump. After the processed product from the heat exchanger is reacted in the solvent (chemical) reactor, it is further sent to the cooler via the heat exchanger, and sent from the cooler to the gas-liquid separator via the pressure regulating valve. Was separated by this gas-liquid separator.

[0003]

However, in the decomposition processing apparatus for the reaction of the solvent (drug) of the material to be decomposed, crystal precipitates may be generated in the solvent (drug) reactor. There is a problem in that the crystal precipitates obstruct the piping of the decomposition treatment apparatus and the danger becomes extremely high due to high pressure. In particular, in the case of the above-mentioned chlorofluorocarbon, sodium fluoride or sodium chloride is crystallized as a decomposition product in a solvent (chemical) reactor, and the crystallized sodium fluoride or the like is deposited in a pipe to a heat exchanger or a cooler. Accumulation accumulates and blocks this piping, which is dangerous and requires frequent operations to be stopped and the inside of the piping to be cleaned, so that the decomposition processing apparatus cannot be operated efficiently.

Accordingly, the present invention has been made to solve the problem of such a conventional apparatus for decomposing a hardly decomposable substance. Efficiently extract and discharge the crystal precipitate that is produced,
An object of the present invention is to provide an apparatus for decomposing difficult-to-decompose substances, which aims at releasing the blockage in the pipes, improving safety, and efficiently operating the decomposition apparatus without stopping the operation.

[0005]

In order to achieve the above object, the apparatus for decomposing hardly decomposable substances according to the present invention comprises a substance to be decomposed from a substance to be decomposed tank 1 and a processing chemical from a processing chemical tank 3. And a heater 16 for heating the mixed object, and a pipe 16 and a pipe 18 from the heater 11.
A reactor 19 that reacts while maintaining the heated object through the reactor, and a processed object reacted in the reactor 19 is connected to a pipe 1.
4. a circulation pump 17 for circulating through the pipe 18 to the reactor 19; a slurry separator 22 connected through the pipe 21 from the circulation pump 17 to separate crystal precipitates from the processed material not circulated to the reactor 19; This slurry separator 22
Cooler 25 that cools decomposition products through piping 24
And a treatment tank 28 for separating the cooled decomposition product through a pipe 26 and a gas-liquid separation at a normal pressure via a pressure regulating valve 27.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of a decomposition processing apparatus according to the present invention. The present invention is an organic chlorinated solvent such as chlorofluorocarbon and trichlene (methylene chloride, chloroform,
Although hardly decomposable organic chlorine substances such as industrial waste such as carbon tetrachloride, dioxin, and PCB are treated as the object to be treated, in this example, the substance that is hardly decomposed from chlorofluorocarbon is described as the object to be treated.

Reference numeral 1 denotes an object tank for storing the object to be decomposed such as chlorofluorocarbon and the like. It is sent to the suction side. Reference numeral 3 denotes a treatment chemical tank provided with a stirrer 2 and stores caustic soda in the treatment chemical tank 3. Instead of the caustic soda solution, a mixture of caustic soda solution and methanol solution may be used. Reference numeral 5 denotes a high-pressure metering pump, which sucks the processing chemical in the processing chemical tank 3 through the pipe 6 together with the substance to be decomposed in the pipe 8, and guides the processing chemical to the mixer 7 at a high pressure.

The decomposition target from the decomposition target tank 1 and the processing chemical from the processing chemical tank 3 are sufficiently stirred and mixed in the mixer 7 through one pipe 9. The to-be-processed material in which the to-be-decomposed material and the processing chemical are mixed is guided to the heater 11 through the pipe 10. The heater 11 includes a primary heater 11a and a secondary heater 11b so as to gradually heat the mixed workpiece. The mixed object to be processed is led to the primary heater 11a through the pipe 10, and in the primary heater 11a, the peripheral surface of the pipe is covered with a heater.
The object to be processed is heated to about 60C to 100C.

The object heated by the primary heater 11a is led to a secondary heater 11b through a pipe 12.
In the secondary heater 11b, the object to be processed is heated by the induction heating device 15 to about 250 ° C. to 300 ° C. This secondary heater 11b may be high-frequency heating. The workpiece heated by the secondary heater 11b is guided to a pipe 18 described later through the pipe 16. The object to be treated is led to the reactor 19 via the pipe 18. Needless to say, the heater 11 is composed of the primary heater 11a and the secondary heater 11b. However, the object to be processed may be heated to a predetermined temperature by a single heater.

The reactor 19 has a heater 2 on its peripheral surface.
0, and the object to be processed is
The temperature is kept and kept at 00 ° C to 350 ° C. This reactor 1
In No. 9, the pressure is set to about 200 kg / cm ² or less to decompose the object to be treated. The treated product decomposed by the decomposition reaction in the reactor 19 is led to the circulation pump 17 through the pipe 14.

The processed material flowing out of the reactor is supplied to a circulation pump 1
7, the material to be treated is circulated and supplied again to the reactor 19 via the pipe 18 via the pipe 18, and the flow time of the decomposition reaction is lengthened, so that the material to be treated can be efficiently and reliably decomposed. A part of the processed material is guided from the circulation pump 17 to the slurry separator 22 through the pipe 21. This pipe 21
Is separated by the slurry separator 22 into crystal precipitates and gas decomposition products. This crystal precipitate is discharged from the lower part of the slurry separator 22 through a valve 23 with sodium fluoride.

The decomposition product that has exited the slurry separator 22 is guided to a cooler 25 through a pipe 24. Since there is no crystal precipitate in the pipe 24 led to this cooler,
There is no need to worry about blockage of the piping. The cooler 25 cools the decomposed material by passing cooling water through the peripheral surface thereof so that it can be liquefied. The liquefiable decomposition product passes through a pipe 26 and is decompressed by pressure regulating valves 27 and 27 and discharged to a processing tank 28. 13 is a pressure control.

The decomposition product sent to the processing tank 28 and decomposed is separated into a liquid and a gas at normal pressure, and the hydrogen and carbon dioxide gas decomposed through the pipe 29 from above the processing tank 28 is processed. Further, the processing liquid is processed as waste liquid through the pipe 30 from below the processing tank 28.

In this embodiment, a substance which is hardly decomposed of chlorofluorocarbon is described as an object to be treated. However, as another example of an organic chlorine compound other than chlorofluorocarbon, for example, tricrene, methyl chloride and the like can be treated with an alkali-methanol or a chemical for treating an aqueous alkali solution. Can be decomposed in the same way as CFCs.

The embodiments of CFCs which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structures of these embodiments, but includes the above-mentioned constitutional requirements according to the present invention. In addition, the present invention achieves the object of the present invention and can be appropriately modified and implemented within a range having the following effects. Further, even if the hardly decomposable substance is a gas, a liquid, or a mixture, it can be embodied by combining the decomposition treatment apparatus of the present invention.

[0016]

As is apparent from the above description, the apparatus for decomposing a hardly decomposable substance according to the present invention is characterized in that the substance to be decomposed from the tank for the substance to be decomposed and the processing chemical from the processing chemical tank are treated with the processing chemical. And a reactor for heating the mixed object, heating the heated object through a pipe from the heater, and reacting the heated object. A circulating pump that circulates the processed material through a pipe to the reactor, a slurry separator that connects the circulating pump through the pipe, and separates crystal precipitates from the processed material that is not circulated to the reactor, and a slurry separator. Because it is configured to include a cooler that cools the decomposition product through a pipe, and a processing tank that separates the cooled decomposition product at normal pressure through a pipe through a pressure regulating valve. Retention time by circulating the workpiece It has a remarkable effect that it can be retained for a long time, the generated crystal precipitates can be efficiently extracted and discharged, and the clogging in the piping can be released to increase safety, and the decomposition equipment can be operated efficiently without stopping operations. Can be expected.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a decomposition processing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decomposition target tank 2 Stirrer 3 Treatment chemical tank 4 Metering pump 5 High pressure metering pump 6 Pipe 7 Mixer 8 Pipe 9 Pipe 10 Pipe 11 Heater 11a Primary heater 11b Secondary heater 12 Pipe 13 Pressure Control 14 Piping 15 Induction heating device 16 Piping 17 Circulating pump 18 Piping 19 Reactor 20 Heater 21 Piping 22 Slurry separator 23 Valve 24 Piping 25 Cooler 26 Piping 27 Pressure regulating valve 28 Processing tank 29 Piping 30 Piping

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2E191 BA12 BA13 BA15 BC01 BC05 BD11 4D004 AA46 AB06 AB07 AB08 AC04 CA12 CA13 CA15 CA22 CA32 CA34 CB04 CB27 CB31 CB44 CC04 CC12 DA02 DA06 DA07 DA12 4G075 AA37 AA52 AA62 CA05 BB05 BD05 CA57 CA65 CA66 DA01 EA01 EA06 EB21

Claims (1)

[Claims] 1. A mixture of a substance to be decomposed of a hardly decomposable substance and a solvent (drug) is subjected to heat exchange under high pressure, the mixture subjected to heat exchange is subjected to a solvent reaction, and after the reaction, the mixture is cooled and depressurized to obtain a gas-liquid mixture. Decomposition target tank in the decomposition processing device to separate
(1) A substance to be decomposed from (1) and a treatment chemical from the treatment chemical tank (3) are mixed, and a heater (11) for heating the mixed substance to be treated, and a heater (11) Reactor (1) that reacts while maintaining the temperature of the heated workpiece through pipe (16) and pipe (18) from 11)
9) and a circulating pump (17) for circulating the processed product reacted in the reactor (19) through the pipe (14) and the pipe (18) to the reactor (19).
And a slurry separator (22) that is connected through a pipe (21) from a circulation pump (17), and separates crystal precipitates from a processed material that is not circulated to the reactor (19), and the slurry separator (22) A cooler (25) that cools the decomposed material through a pipe (24), and a pressure regulating valve (2) that passes the cooled decomposed material through a pipe (26).
An apparatus for decomposing hardly decomposable substances, comprising: a processing tank (28) for performing gas-liquid separation at normal pressure via 7).