JP2002316803A - Method and facility for recovering hydrochloric acid from evolved gas of dechlorination treatment of chlorine-containing resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably recover hydrogen chloride in evolved gas as a hydrochloric acid without the occurrence of problems by the dust included in the evolved gas when the chlorine-containing resins of agricultural polyvinyl chloride sheets, or the like, are subjected to dechlorination treatment. SOLUTION: This method comprises subjecting the gas containing the hydrogen chloride evolved by the dechlorination treatment of the chlorine-containing resins to combustion treatment to remove the organic components included in the gas, introducing the high-temperature gas after the combustion treatment into a cooling facility to rapidly cool the gas, then removing the hydrochloric acid from the gas. Water or aqueous solution is sprayed to the inner wall surfaces of the high-temperature gas introducing section of the cooling facility, by which the dust included in the high-temperature gas is prevented from adhering to the inner wall surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recovering hydrochloric acid from a gas containing hydrogen chloride generated by dechlorinating a chlorine-containing resin.

[0002]

2. Description of the Related Art In recent years, plastics have been rapidly increasing as industrial wastes and general wastes, and their disposal has become a major social problem. Above all, chlorine-containing resin (mainly vinyl chloride) used for agricultural sheets and resin-coated electric wires
As a result, hydrogen chloride gas generated during the incineration process may cause facility problems such as damaging the wall of the incinerator. In addition, there is also a problem that harmful substances such as dioxin are generated when the chlorine-containing resin is burned. For this reason, at present, most of the chlorine-containing resins are dumped at landfill sites. However, the dumping of plastic causes the ground of the landfill to deteriorate, and it is not preferable in terms of environmental measures.In addition, shortage of land for landfilling is becoming a social problem in recent years. There is an urgent need to establish a large-scale processing method.

To solve such a problem, Japanese Patent Application Laid-Open No. H10-71
Japanese Patent Publication No. 384 discloses a method of dechlorinating a chlorine-containing resin using a rotary kiln-type chlorine removing apparatus and recovering a generated gas containing hydrogen chloride generated by the dechlorination. In this method, the residue of the pyrolysis resin after the chlorine is removed is recovered, and a gas containing a high concentration of hydrogen chloride is generated. The hydrogen chloride in the generated gas can be recovered as hydrochloric acid.

[0004]

However, Japanese Patent Laid-Open Publication No.
The method disclosed in Japanese Patent Publication No. 0-71384 has the following problems. When a chlorine-containing resin is dechlorinated, trace amounts of organic components such as light hydrocarbons and tar are generated by the thermal decomposition of the resin, and these will be included in the generated gas. In such a case, it is necessary to remove these organic components from the generated gas. As a method for removing the organic components in the generated gas as described above, it is conceivable to burn the gas. However, when such a burning process is performed, there is a concern that harmful substances such as dioxin may be generated. For this reason, in the above-mentioned combustion processing, it is necessary to perform high-temperature combustion of 1200 ° C. or more to completely burn the organic components, and to rapidly cool the burned gas in order to prevent the generation of dioxin in the process of cooling the combustion gas.

[0005] When a general agricultural vinyl sheet is treated as a chlorine-containing resin, about 10 to 20 mass% of earth and sand adheres in the recovery step. Such soil cannot be sufficiently removed even by washing, and when the agricultural vinyl sheet with the remaining earth and sand adhered is dechlorinated, the earth and sand is transferred to the generated gas as dust. In the process of burning and removing the organic components in the generated gas, part of the dust is melted and turned into slag, which adheres to the wall surface of the gas quenching equipment. If such deposits increase, the operation is hindered, so that periodic cleaning is required.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the prior art and eliminate the problem caused by dust contained in generated gas when chlorine-containing resins such as agricultural vinyl sheets are dechlorinated. Another object of the present invention is to provide a method and equipment capable of stably recovering hydrogen chloride in generated gas as hydrochloric acid.

[0007]

In order to solve the above-mentioned problems, the present invention has the following features. [1] Combustion treatment of gas containing hydrogen chloride generated by dechlorination of chlorine-containing resin removes organic components contained in the gas, and introduces high-temperature gas after the combustion treatment into cooling equipment. Quenching, and then recovering hydrochloric acid from the gas, wherein water or an aqueous solution is sprayed on the inner wall surface of the high-temperature gas introduction part in the cooling facility, and dust contained in the high-temperature gas adheres to the inner wall surface. A method for recovering hydrochloric acid from a gas generated by dechlorination of a chlorine-containing resin, which is characterized by preventing the occurrence of chlorination.

[2] In the method for recovering hydrochloric acid of the above [1], a high-temperature gas is blown into an aqueous solution in a cooling facility to quench the solution, and a part of the aqueous solution absorbing hydrogen chloride in the gas by blowing the high-temperature gas. A method for recovering hydrochloric acid from a gas generated by dechlorination of a chlorine-containing resin, wherein the hydrochloric acid is extracted and water is sprayed on an inner wall surface of a high-temperature gas introduction portion. [3] A cooling tank containing an aqueous solution therein, a gas introduction pipe inserted into the cooling tank and blowing a high-temperature gas into the aqueous solution in the cooling tank from a gas blowing hole, and a gas on the inlet side of the cooling tank. A chlorine-containing resin, comprising: a water spray mechanism for spraying an aqueous solution on an inner wall surface of an inlet pipe portion; and a supply unit for extracting an aqueous solution in the cooling bath and supplying the extracted aqueous solution to the water spray mechanism. For recovering hydrochloric acid from gas generated by dechlorination.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of the method and the equipment of the present invention. The gas generated by dechlorination of a chlorine-containing resin is converted into an organic component contained in the gas. 2 shows a process and a facility for rapidly cooling the high-temperature gas after the combustion treatment after the combustion treatment for the purpose of removing the gas. FIG. 1 is an explanatory diagram showing a cross section of a cooling tank, and FIG. 2 is an explanatory diagram showing a horizontal cross section of a watering mechanism.

In FIG. 1, reference numeral 1 denotes a cooling tank in which an aqueous solution (a hydrochloric acid aqueous solution in which hydrogen gas in a gas is absorbed by blowing a high-temperature gas) is placed. The gas introduction pipe 2 is inserted vertically toward the tank bottom. A plurality of gas injection holes 3 (for example, slits) for blowing high-temperature gas into the aqueous solution in the cooling tank 1 are formed near the lower end of the gas introduction pipe 2. The gas introduction pipe 2 is made of a material having corrosion resistance to high-concentration hydrogen chloride and heat resistance to a high-temperature gas of 1200 ° C. or higher. It is preferable that the outer pipe be made of a material having good heat transfer with the aqueous hydrochloric acid solution. Specifically, it is preferable to be made of, for example, graphite.

A portion of the gas introduction pipe 2 which is a portion for introducing the high-temperature gas into the cooling tank 1, more specifically, a portion of the gas introduction pipe 2 on the inlet side of the cooling tank (immediately before being introduced into the cooling tank 1). Sprays an aqueous solution (aqueous solution in cooling tank 1) on the inner wall of the pipe,
A water spraying mechanism 4 for forming a liquid film by water spraying is provided on the inner wall surface of the pipe (the inner wall surface of the gas introduction pipe portion inserted into the cooling tank 1). In order to supply the aqueous solution in the cooling tank 1 to the sprinkling mechanism 4, a liquid extraction pipe 5 equipped with a pump 6 is connected to a lower part of the cooling tank 1.
Are guided to the water spray mechanism 4. Further, a cooler 7 (heat exchanger) for cooling the aqueous solution withdrawn from the cooling tank 1 is provided in the middle of the liquid discharge pipe 5. A circulation pipe 8 branches from the middle of the liquid discharge pipe 5 and is connected to the cooling tank 1.

The sprinkling mechanism 4 includes a ring-shaped header 9 provided along the outer periphery of the gas introduction pipe 2 as shown in FIG.
And water spray nozzles 10 provided at a plurality of locations in the circumferential direction of the ring-shaped header 9. Each of the water spray nozzles 10 penetrates the pipe wall of the gas introduction pipe 2 or
Is connected to a blow hole formed in the tube wall of the tube. The drain pipe 5 is connected to the ring-shaped header 9. In this embodiment, the end of the liquid discharge pipe 5 is set at 2
It branches into a book, and both branch pipes are connected to the ring-shaped header 9 in a 180 ° relationship.

In the drawings, reference numeral 11 denotes an exhaust pipe for leading gas (gas with hydrochloric acid vapor) blown into the cooling bath 1 to the outside of the bath, and 12 denotes a high-temperature gas blown into the cooling bath 1. It is a partition for preventing intrusion into the extraction pipe 5, and a part of this partition is provided with an opening for passing a liquid. Reference numeral 13 denotes a pedestal for supporting a pipe end of the gas introduction pipe 2, and a slit for blowing high-temperature gas is also formed on the pedestal 13. The structure of the gas cooling device described above (the cooling tank 1 in the present embodiment), the means for introducing gas into the cooling device (the gas introduction pipe 2 in the present embodiment), and the structure of the water sprinkling mechanism 4 are the same as those in the above embodiment. However, the type of the cooling device and the mode of introducing the gas into the cooling device can be arbitrarily selected. Also, the structure of the water spray mechanism 4 is not limited as long as it can spray water on the inner wall surface of the high-temperature gas introduction part of the cooling device to form a liquid film. Further, in the present embodiment, the cooling tank 1 is attached to the watering mechanism 4.
Although a part of the aqueous solution is supplied to spray water, the water for spraying or the aqueous solution may be from another supply source.

Next, an embodiment of the method of the present invention in the above-described facility will be described. The gas (evolved gas) generated by a chlorine-containing resin dechlorination device (not shown) (for example, a rotary kiln type dechlorination device) contains high-concentration hydrogen chloride and is generated by thermal decomposition of the chlorine-containing resin. Organic components such as light hydrocarbons and tar are also included. Therefore, the generated gas is burned under such conditions that these organic components are completely burned and dioxin is not generated by the burning. Usually, this combustion treatment is performed under the conditions of a combustion temperature of 1100 ° C. or more and a combustion time of about 2 seconds.

The high-temperature gas that has undergone this combustion step is led to a cooling facility shown in FIG. The high-temperature gas is introduced from the gas introduction pipe 2 into the cooling tank 1.
The aqueous solution (part of the aqueous hydrochloric acid solution in the cooling tank 1 extracted through the liquid extraction pipe 5) is sprayed onto the inner wall surface of the pipe.
This water spray forms a liquid film on the inner wall surface of the pipe, and prevents dust contained in the high-temperature gas from adhering to the inner wall surface. The amount of the aqueous solution sprinkled from the sprinkling mechanism 4 may be such that a liquid film is formed without drying the inner wall surface of the tube. The amount of the high-temperature gas supplied to the cooling equipment is determined by the amount of the chlorine-containing resin to be treated in the dechlorination apparatus, and the amount of the aqueous solution sprinkled from the water spray mechanism 4 is determined according to the amount and temperature of the high-temperature gas.

The high-temperature gas introduced into the gas introduction pipe 2 is blown into the aqueous solution in the cooling tank 1 from the gas blowing holes 3. At this time, the aqueous solution sprinkled from the sprinkling mechanism 4 is also blown into the aqueous solution together with the gas. The high-temperature gas is blown into the aqueous solution as bubbles from the gas injection holes 3, and is rapidly cooled in the aqueous solution to prevent the generation of dioxin when the high-temperature gas is cooled, and is contained in the gas. Hydrogen chloride is absorbed in the aqueous solution. In addition, the aqueous solution in the cooling tank 1 is vigorously stirred by high-temperature gas bubbles,
The temperature of the aqueous solution in the cooling bath 1 is kept uniform. A part of the aqueous solution in the cooling tank 1 is extracted by a liquid extraction pipe 5, cooled by a cooler 7, a part of the aqueous solution is returned to the cooling tank 1 by a circulation pipe 8, and the rest is discharged by the water spray mechanism 4. Supplied to The gas blown into the aqueous solution is discharged from the exhaust pipe 11 along with hydrochloric acid vapor, sent to a hydrochloric acid recovery facility equipped with an absorption tower or the like, and recovers hydrochloric acid from the gas.

FIG. 3 shows an embodiment in which the present invention is applied to a chlorine-containing resin treatment facility. Reference numeral 14 denotes a chlorine-containing resin crusher provided on the equipment entrance side, and reference numeral 15 denotes this crusher. A magnetic separator (a device for magnetically separating the chlorine-containing resin conveyed on the conveyor) for removing metals from the chlorine-containing resin crushed in 14, and a magnetic separator 16 for the magnetic separator in the magnetic separator 15 A transfer means for transferring the film-form chlorine-containing resin, 18 is a dryer for drying the film-form chlorine-containing resin transferred by the transfer means 16, and 19 is a dryer for drying the film-form chlorine-containing resin. A volume reduction machine 17 for volume reduction processing is provided with the magnetic separator 15.
Transfer means for transferring the solid chlorine-containing resin magnetically separated in the above, 20 is a storage tank of the chlorine-containing resin, 21 is a storage tank of the solid heat medium used in the dechlorination treatment apparatus, and 22 is the storage tank 20 Transfer means for transferring the chlorine-containing resin and the solid heating medium cut out from
3 is a rotary kiln type dechlorination apparatus, 24 is a combustion furnace for burning and processing the generated gas containing chlorine and hydrogen generated by the dechlorination apparatus 23, A is the cooling equipment shown in FIGS. Is an absorption tower for absorbing hydrogen chloride (hydrochloric acid vapor) in the gas discharged from the cooling facility A,
26 is a crude hydrochloric acid tank for storing the crude hydrochloric acid collected in the absorption tower 25, 27 is a neutralization tower for neutralizing the hydrogen chloride-containing gas discharged from the absorption tower 25, and 28 is the crude hydrochloric acid tank. A stripping tower for distilling the hydrochloric acid recovered in the tank 26, 29 is a recovered hydrochloric acid tank, 30 is an impurity removing device for removing impurities from the recovered hydrochloric acid, and 31 is discharged from the dechlorination device 23. Means for transferring the pyrolysis resin residue containing the solid heat medium; 32, a vibrating screen for separating the solid heat medium from the pyrolysis resin residue containing the solid heat medium; 33, a pyrolysis resin residue discharged from the vibrating screen 32; Transfer means, 34 is a crusher for crushing the pyrolysis resin residue containing the solid heat medium, 35 is the desalination treatment apparatus 2
A hot air generating furnace 36 for generating a heating gas to be supplied to the heating device 3, heats the heating gas discharged from the dechlorination device 23 and a carrier gas (such as nitrogen) to be supplied to the dechlorination device 23. This is a heat exchanger for heating the carrier gas by replacement.

In the other drawings, reference numeral 37 denotes a storage hopper for storing the pyrolysis resin residue after the dechlorination treatment, and reference numeral 38 denotes a heated hydrochloric acid aqueous solution discharged from the bottom of the stripping tower 28 and introduced into the absorption tower 25. A cooling device for cooling; 39, a heating device for the hydrochloric acid aqueous solution discharged from the bottom of the stripping tower 28; 40, a hydrochloric acid cooling device; 41, 42, 43 blowers;
44, 45 and 46 are pumps.

Next, a method for treating a chlorine-containing resin in the above facility will be described. Normally, the film-form chlorine-containing resin and the solid-form chlorine-containing resin are separately carried into the facility and separately treated. The film-like chlorine-containing resin carried into the facility is crushed by a crusher 14, and then iron and main metals and metals are removed via a magnetic separator 15, and then sent to a dryer 18 by a transfer means 16. And dried. Next, after being subjected to a volume reduction treatment (for example, a resin is softened or melted or semi-melted by frictional heat by stirring or extrusion or external heating, and then solidified) by the volume reducer 19, the resin is stored in the storage tank 20. Will be stored. On the other hand, the solid chlorine-containing resin carried into the facility is crushed by the crusher 14 and then transferred as it is by the transfer means 17 and stored in the storage tank 20.

The chlorine-containing resin (film-form chlorine-containing resin or solid chlorine-containing resin) cut out from the storage tank 20 is transferred by the transfer means 22 together with the solid heat medium (for example, coke) cut out from the storage tank 21. It is supplied to a rotary kiln type dechlorination apparatus 23. A heating gas (a heating gas for indirectly heating the chlorine-containing resin in the apparatus) is supplied from a hot air generator 35 to the dechlorination apparatus 23, and the gas (nitrogen) heated by the heat exchanger 36 is supplied to the dechlorination apparatus 23. ) Is supplied as a carrier gas of hydrogen chloride gas generated in the apparatus. In the dechlorination apparatus 23, the chlorine content contained in the resin is dissociated as chlorine hydrogen gas by heating the chlorine-containing resin together with the solid heat medium. The gas containing chlorine hydrogen generated from the dechlorination device 23 is introduced into the combustion furnace 24, and the organic components contained in the generated gas are almost completely burned off. This combustion furnace 2
The hot gas discharged from 4 is introduced into a cooling facility A as shown in FIGS. 1 and 2, and is rapidly cooled according to the method of the present invention.
In the cooling facility A, the high-temperature gas is rapidly cooled, and the hydrogen chloride in the gas is absorbed by the aqueous solution, and becomes part of the hydrochloric acid aqueous solution in the cooling bath 1.

The gas quenched in the cooling equipment A is discharged from the cooling tank 1 together with the hydrochloric acid vapor, and guided to the absorption tower 25.
Soft water or treated water is supplied to the absorption tower 25,
The hydrochloric acid vapor in the gas is recovered as hydrochloric acid in the absorption tower 25 and stored in the crude hydrochloric acid tank 26. Exhaust gas discharged from the top of the absorption tower 25 is introduced into the neutralization tower 27 and neutralized with caustic soda. The crude hydrochloric acid stored in the crude hydrochloric acid tank 26 is supplied to the stripping tower 28 and distilled into hydrochloric acid. The hydrochloric acid recovered from the top of the stripping tower 28 is stored in a recovered hydrochloric acid tank 29, after which impurities are removed by an impurity removing device 30 and recovered as product hydrochloric acid.

On the other hand, the resin residue after the dechlorination treatment in the dechlorination treatment device 23 is discharged from the dechlorination treatment device 23 together with the solid heat medium, and sent to the next step by an appropriate transfer means 31. That is, when the processing object is a film-like chlorine-containing resin, the pyrolysis resin residue including the solid heat medium is separated from the solid heat medium by the vibrating sieve 32 and then transferred to the transfer means 33.
It is discharged outside the system through The separated solid heat medium is sent to the storage tank 21 by an appropriate transfer means, and is circulated from the storage tank 21 to the dechlorination apparatus 23 via the transfer means 22. When the processing target is a solid chlorine-containing resin, the pyrolysis resin residue containing the solid heat medium is removed by a crusher 3.
After being crushed in 4, the solid heat medium is separated by the vibrating sieve 32 in the same manner as described above, and the separated pyrolyzed resin residue and the solid heat medium are respectively treated in the same manner as described above.

[0023]

EXAMPLE Processing of chlorine-containing resin using the equipment shown in FIG.
Was done. Files such as collected agricultural vinyl sheets
Lum-like chlorine-containing resin (water: 25 mass%, chlorine: 22.
5 mass%, inorganic matter: 15 mass%) at 1,260 kg / hr
Is supplied to the crusher 14 at a supply amount of
(Hereinafter referred to as “Rotary Kiln 23”)
Crushed to the appropriate dimensions. Thereafter, the dryer 18 and the volume reducer 19
Through a 30 mmφ volume-reduced material (water: 8.7 mass%,
Chlorine 37.8 mass% (dry basis), ash content: 3.2 mass%
(Dry basis)). This is temporarily stored in storage tank 20
After the volume reduction, 750 kg / hr, coke in storage tank 21
(Solid heating medium): Rotor with supply amount of 375 kg / hr
It was supplied to the Lee kiln 23. In the rotary kiln 23
Is discharged from the rotary kiln 23 in the heat exchanger 36.
Nitrogen heated to 200 ° C by the emitted heating gas
With 300 Nm as carrier gas³/ Hr supply amount
Supplied. The temperature in the rotary kiln 23 is 325 ° C.
430 ° C generated by the hot air generator 35
17000Nm for heating gas ³/ H with rotary feed rate
It was supplied to kiln 23.

From the rotary kiln 23, 622 kg /
The hr-dechlorinated product (pyrolysis resin residue) and coke were discharged, and this was separated into a dechlorinated product and coke by the vibrating sieve 32, and the coke was returned to the storage tank 21 for circulating use. On the other hand, the dechlorinated product is sent to the storage hopper 37 and 262 kg /
hr of dechlorinated product was recovered. The gas generated from the rotary kiln 23 was supplied to a combustion furnace 24, and the organic components contained in the gas were completely burned at 1350 ° C. with fuel gas and air. Table 1 shows the composition and temperature of the gas generated from the rotary kiln 23 and the gas after the combustion treatment.

The high-temperature combustion gas discharged from the combustion furnace 24 was sent to the cooling facility A, where the gas was rapidly cooled. In the equipment shown in FIGS. 1 and 2, a part of the hydrochloric acid aqueous solution is extracted from the cooling tank 1, and this is cooled by the cooler 7.
While supplying at a supply rate of m ³ / hr, 5 m ³ / hr was circulated through the circulation pipe 8 to the cooling tank 1. The gas containing hydrochloric acid vapor from the cooling tank 1 is sent to the absorption tower 25 to recover the crude hydrochloric acid, and the recovered crude hydrochloric acid is processed through the stripping tower 28 and the impurity removing device 30 to be 695 kg / h.
An aqueous 35% hydrochloric acid solution of r was recovered.

The gas generated from the rotary kiln 23 contained 6 kg / hr of dust (mainly dust originating from earth and sand contained in the chlorine-containing resin). No dust or attached matter (slag) as if this was partially melted was found on the inner wall surface. On the other hand, when the spraying of the aqueous hydrochloric acid solution on the inner wall surface of the gas inlet pipe 2 was stopped, deposits such as dust came to be found on the inner wall face of the gas inlet pipe 2.

[0027]

[Table 1]

[0028]

According to the present invention described above, when chlorine-containing resins such as agricultural vinyl sheets are dechlorinated, there is no problem caused by dust contained in the generated gas, and hydrogen chloride in the generated gas is eliminated. Can be stably recovered as hydrochloric acid.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the method and equipment of the present invention.
Explanatory drawing showing the cooling tank in cross section

FIG. 2 is an explanatory view showing a horizontal cross section of the watering mechanism in the embodiment of FIG. 1;

FIG. 3 is an explanatory view showing one embodiment in which the present invention is applied to a chlorine-containing resin treatment facility.

[Description of Signs] 1 ... Cooling tank, 2 ... Gas introduction pipe, 3 ... Gas blowing hole, 4
... water spraying mechanism, 5 ... liquid extraction pipe, 6 ... pump, 7 ... cooler, 8 ... circulation pipe, 9 ... ring-shaped header, 10 ... water spray nozzle, 11 ... exhaust pipe, 12 ... partition wall, 13 ... pedestal, 14
... crusher, 15 ... magnetic separator, 16 ... transfer means, 17 ... transfer means, 18 ... dryer, 19 ... volume reducer, 20 ... storage tank, 2
DESCRIPTION OF SYMBOLS 1 ... Storage tank, 22 ... Transfer means, 23 ... Dechlorination processing apparatus,
24: combustion furnace, 25: absorption tower, 26: crude hydrochloric acid tank, 2
7: neutralization tower, 28: stripping tower, 29: recovered hydrochloric acid tank, 3
0: impurity removing device, 31: transfer means, 32: vibrating sieve,
33: transfer means, 34: crusher, 35: hot air generator, 3
6 ... heat exchanger, 37 ... storage hopper, 38 ... cooling device,
39: heating device, 40: hydrochloric acid cooling device, 41, 42, 4
3 Blower, 44, 45, 46 Pump, A Cooling equipment

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08J 11/12 F23J 15/00 C F23J 15/02 (72) Inventor Tetsu Iemoto Marunouchi, Chiyoda-ku, Tokyo 1-2-2 Nihon Kokan Co., Ltd. (72) Inventor Shinya Sekine 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-Term in Nihon Kokan Co., Ltd. 3K070 DA05 DA07 DA09 DA12 DA36 DA37 DA43 DA46 DA48 DA52 4D002 AA19 AC04 BA02 CA01 DA35 FA01 GA03 GB03 4F301 AA17 CA09 CA24 CA52 CA68 CA72

Claims (3)

[Claims] A gas containing hydrogen chloride generated by dechlorinating a chlorine-containing resin is subjected to a combustion treatment to remove organic components contained in the gas, and the high-temperature gas after the combustion treatment is sent to a cooling facility. A method for recovering hydrochloric acid from the gas by introducing and quenching, and then water or an aqueous solution is sprayed on the inner wall surface of the high-temperature gas introduction part in the cooling facility, and dust contained in the high-temperature gas is removed from the inner wall surface. A method for recovering hydrochloric acid from a gas generated by dechlorination of a chlorine-containing resin, wherein the hydrochloric acid is prevented from adhering to the surface. 2. A cooling facility for rapidly cooling by injecting a high-temperature gas into an aqueous solution, and extracting a part of the aqueous solution which has absorbed hydrogen chloride in the gas by injecting the high-temperature gas to form an inner wall surface of a high-temperature gas introduction portion. The method for recovering hydrochloric acid from gas generated by dechlorination of a chlorine-containing resin according to claim 1, wherein water is sprinkled. 3. A cooling tank containing an aqueous solution therein, a gas introduction pipe inserted into the cooling tank and blowing a high-temperature gas into the aqueous solution in the cooling tank from a gas injection hole, and a cooling tank inlet side. A water spray mechanism for spraying the aqueous solution on the inner wall surface of the gas introduction pipe portion, and a supply means for extracting the aqueous solution in the cooling tank and supplying the extracted aqueous solution to the water spray mechanism. Hydrochloric acid recovery equipment from gas generated from dechlorination of contained resin.