JP2003321573A - Method of treatment for resins containing chlorine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stably operable method of treatment for chlorine- containing resins by preventing emission of hydrochloric acid gas in a volume reducing step in dechlorination processing of the chlorine-containing resins. <P>SOLUTION: The method of treatment for resins containing chlorine has a dechlorination process comprising a step for pyrolyzing the chlorine-containing resins after drying and reducing volume of the chlorine-containing resins in a film shape, and supplying it to a rotary kiln with a solid heat transfer medium and heating to obtain generated gas containing hydrochloric acid gas and residues of pyrolysis of the resins from which chlorine content is removed, and a gas combustion step combusting exhausted gas containing hydrochloric acid from the rotary kiln to remove organic components contained in the generated gas and a hydrochloric acid recovering step recovering the hydrogen chloride from the generated gas, the resins containing chlorine are dried to have less than 10% of a water content. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for dechlorinating a chlorine-containing resin and recovering hydrochloric acid from the generated gas.

[0002]

2. Description of the Related Art In recent years, synthetic resins such as plastics have rapidly increased as industrial wastes and general wastes, and the treatment thereof has become a socially serious problem. Among them, chlorine-containing resins such as vinyl chloride have a problem that hydrogen chloride gas generated during combustion damages the furnace wall of the incinerator. For this reason, in reality, the large-scale disposal of chlorine-containing resins has to rely on the disposal of waste in landfills. However, the dumping of plastics causes land subsidence at landfills, is not desirable in terms of environmental protection, and recently, the shortage of land for landfill is becoming a social problem. Development of a mass processing method is earnestly desired.

In order to solve the above problems, Japanese Patent Laid-Open No.
Japanese Patent Application Laid-Open No. 0-153522 discloses a technique in which chlorine-containing resins are heat-treated by using an indirect heating (external heating) rotary kiln to perform dechlorination, and hydrocarbons and hydrochloric acid are separately recovered and effectively used. It is disclosed. With this technology,
Among chlorine-containing resins, film-based waste materials such as agricultural vinyl sheets have a high water content and inorganic content (for example, water content: 50%, inorganic content: 20%). The chlorine content of the chlorine-containing resins in the rotary kiln is a problem in that the chlorine content in the generated gas cannot be economically recovered because the water content in the generated gas becomes extremely high just by dechlorinating the contained resin by the conventional method. The solution is to dry before feeding. Also,
By reducing the volume of dried chlorine-containing resins, it is easy to supply a fixed amount to the dechlorination process.

[0004]

However, since film-type chlorine-containing resins are often used and stored outdoors like agricultural vinyl sheets, the amount of water contained therein fluctuates significantly, and volume reduction treatment is performed. In order to stabilize the later form, it is necessary to adjust the operating conditions for volume reduction each time. Further, it is preferable not to raise the temperature of the chlorine-containing resins to 150 ° C. or higher in order to prevent generation of hydrogen chloride gas when the volume is reduced. Therefore, there is also a problem that temperature control is difficult.

Therefore, an object of the present invention is to solve the above problems of the prior art and prevent the generation of hydrogen chloride gas in the volume reduction treatment carried out when dechlorinating chlorine-containing resins, thereby ensuring stable operation. Another object of the present invention is to provide a method for treating a chlorine-containing resin that enables the above.

[0006]

The features of the present invention for solving the above problems are as follows. (1) a drying step of the film-like chlorine-containing resin, a volume-reducing treatment step of softening or melting or semi-melting the film-like chlorine-containing resin that has been subjected to the step, and then solidifying to reduce the volume The chlorine-containing resin that has undergone the process is pyrolyzed by supplying it to a rotary kiln together with a solid heating medium and heating it, and the chlorine-containing resin is decomposed into a gas containing hydrogen chloride and a resin pyrolysis residue from which chlorine has been removed. Dechlorination treatment step to separate into, a gas combustion step of burning the generated gas containing hydrogen chloride discharged from the rotary kiln to remove organic components contained in the generated gas, and hydrogen chloride from the generated gas after the step In the method for treating chlorine-containing resins, the method includes the step of recovering hydrochloric acid to recover the chlorine-containing resins by the drying step so that the water content of the chlorine-containing resins is 10% or less. Method of processing chlorine-containing resins, characterized and. (2) As a pre-step of the drying step of the film-like chlorine-containing resin, there is a crushing treatment step of crushing the film-like chlorine-containing resin, and the crushing diameter of the crushing treatment step is 30 to 80 mm.
The method for treating chlorine-containing resins according to (1), characterized in that the crushed film-like chlorine-containing resin is used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention reduces the volume of a film-form chlorine-containing resin by a drying step, and the film-form chlorine-containing resin that has undergone the step is softened or melted or semi-melted and then solidified. The chlorine-containing resin is thermally decomposed by supplying the volume-reducing treatment step and the chlorine-containing resin that has passed through the step to a rotary kiln together with a solid heat medium to heat the chlorine-containing resin so that the chlorine-containing resin contains hydrogen chloride-containing gas and chlorine. A dechlorination treatment step of separating into a resin pyrolysis residue that has been removed, a gas combustion step of burning the generated gas containing hydrogen chloride discharged from the rotary kiln to remove organic components contained in the generated gas, and In the method for treating chlorine-containing resins, which comprises a hydrochloric acid recovery step of recovering hydrogen chloride from the evolved gas that has passed through the steps, in the drying step, the water content of the chlorine-containing resins is reduced. It amounts and is characterized in that drying below 10%.

Further, in the above-mentioned treatment method, there is a crushing treatment step of crushing the film-like chlorine-containing resin as a pre-step of the drying step of the film-like chlorine-containing resin, and the film-like chlorine-containing resin crushed in the step is included. The crushed diameter of the resin is preferably 30 to 80 mm.

FIG. 1 is an embodiment of the present invention and is an explanatory view showing a processing flow of chlorine-containing resins. In FIG. 1, 1 is a crushing process of a film-like chlorine-containing resin, 2 is a drying process of a film-like chlorine-containing resin, 3 is a volume reducing process of a film-like chlorine-containing resin, and 4 is a chlorine-containing resin using a rotary kiln. Dechlorination treatment step, 5 is a gas combustion step for burning the organic component in the generated gas generated in the dechlorination treatment step 4, and 6 is for recovering and removing hydrogen chloride from the generated gas that has passed through this gas combustion step 5. A hydrochloric acid recovery step, 7 is a solid heat medium separation step for separating a solid heat medium from the resin thermal decomposition residue generated in the dechlorination step 4, and 8 is a resin thermal decomposition residue crushing step.

Usually, the film-like chlorine-containing resin is crushed in the crushing process 1 to a size that can be supplied to the rotary kiln. However, this crushing treatment may be omitted depending on the size of the film-like chlorine-containing resin carried in.

Next, in the drying step 2, the film-form chlorine-containing resin is dried to a water content that is acceptable for recovering hydrochloric acid. In the present invention, in order to stabilize the operation of the volume reduction treatment 3 which is the next step, the moisture concentration of the chlorine-containing resins is reduced to 10% or less by using a dryer or the like. If the water content of the chlorine-containing resin is 10% or less, the temperature of the chlorine-containing resin is reduced to 100 to 12 in a short time when the volume is reduced.
Since the temperature can be raised to about 0 ° C, the shape of the volume-reduced product is stable. Further, the nonuniformity of the water concentration is eliminated, a local high temperature portion is unlikely to be generated, and the temperature control for preventing generation of hydrogen chloride gas is easy. More preferably, by setting the water content of the chlorine-containing resin to 5% or less, the shape of the waste plastic whose volume is further reduced becomes stable. If the water content of the chlorine-containing resin is more than 10%, the volume reduction treatment ends without partially melting the surface of the chlorine-containing resin, so that subsequent cutting out is not stable. Energy for reducing the volume of chlorine-containing resins is input by a heater or the like. However, by setting the water concentration of the chlorine-containing resins to 10% or less, the volume-reducing energy lost as heat of vaporization is reduced. Since it is possible to reduce the amount of energy for volume reduction to be input, it is difficult for the temperature to rise as a whole and a high temperature part is not generated. Therefore, temperature control is facilitated and generation of hydrogen chloride gas can be prevented.

Usually, the film-like chlorine-containing resin is dried, but it is preferable to heat the film-like chlorine-containing resin in a relatively low temperature range in consideration of the softening of the chlorine-containing resin due to the heating.
In addition to drying by heating, for example, dehydration / drying using a dehydrator using centrifugal force may be used.

The film-like chlorine-containing resin which has been dried is reduced in volume by a volume-reducing treatment step 3 in which the film-like chlorine-containing resin is softened or melted or semi-melted and then solidified. The purpose of such volume-reducing treatment of film-like chlorine-containing resin is to reduce the equipment including the transportation equipment to the rotary kiln, and to increase the bulk density of the resin to remove chlorine in the rotary kiln. This is to improve efficiency. Further, particularly in the case of a film-like chlorine-containing resin having a low bulk density, it is difficult to supply a fixed amount to the dechlorination treatment step 4. Therefore, the volume-reducing treatment 3 facilitates the constant supply. . Volume reduction treatment 3 is a treatment to reduce the volume by heating the film-like chlorine-containing resin to soften or melt or semi-melt it and then solidify it, and carry out by any method such as melting, crushing, compression, etc. can do. For example, a method of softening or melting or semi-melting a film-shaped chlorine-containing resin and reducing the volume by thermal extrusion, vigorously stirring the film-like chlorine-containing resin with a stirring blade or the like to soften or melt or semi-melt by frictional heat. Volume reduction method, using a cutting mechanism such as a screw feeder to compress waste plastic to generate frictional heat that melts the surface of the waste plastic and compresses it to reduce volume. There is a method, a method of reducing the volume by other heating means, etc., but in any case, it is preferable to carry out the treatment in a temperature range where the dechlorination reaction does not occur.

The film-form chlorine-containing resin, which has been volume-reduced as described above, is subjected to dechlorination treatment in a dechlorination treatment step 4 using a rotary kiln. In this dechlorination treatment step 4, the film-like chlorine-containing resin is charged together with the solid heat medium into the rotary kiln, and the film-like chlorine-containing resin is heated while being transferred to thermally decompose the chlorine-containing resin to remove the chlorine-containing resin. The generated gas containing hydrogen chloride and the resin pyrolysis residue from which chlorine has been removed are separated. In order to prevent the oxidation of the chlorine-containing resin and the production of harmful components such as dioxins, it is preferable to ventilate a reducing gas or an inert gas such as nitrogen as a carrier gas in the rotary kiln.

The rotary kiln has a direct heating system in which a heating gas is directly supplied into a passage into which a chlorine-containing resin is charged to heat the chlorine-containing resin, and a chlorine-containing resin in the passage is indirectly supplied from the outside of the inner wall of the kiln. Although there is an indirect heating system for heating, it is preferable to use a rotary kiln of the indirect heating system in the method of the present invention.

The chlorine-containing resin supplied together with the solid heating medium in the rotary kiln is heated while being transferred in the longitudinal direction of the kiln, and the chlorine-containing resin is thermally decomposed into a generated gas containing hydrogen chloride and a resin thermal decomposition residue. To be done.
After the chlorine content is removed in this manner, the resin pyrolysis residue is discharged from the end of the rotary kiln.

The desorption reaction of chlorine from the chlorine-containing resin in the rotary kiln starts at about 150 ° C and reaches 350 ° C.
Finish in about a degree. Further, although a thermal decomposition reaction of other resins also occurs in the rotary kiln, the amount of thermal decomposition is small in the above temperature range (150 to 350 ° C.). Therefore, the heating temperature of the chlorine-containing resin in the rotary kiln (exhaust gas temperature at the outlet of the rotary kiln) is in the range of 300 to 350 ° C in which the amount of thermal decomposition of resins other than the chlorine-containing resin is small and the chlorine desorption reaction is active. Preferably. Further, hydrogen chloride shows a strong corrosiveness with respect to the steel materials constituting the device in the temperature range below 150 ° C. and above 350 ° C., and therefore, the corrosion of the device due to hydrogen chloride,
In particular, the heating temperature of the chlorine-containing resin is preferably in the range of 300 to 350 ° C. also from the viewpoint of appropriately preventing corrosion of each part of the inner pipe.

The solid heat medium (powder and granules) supplied together with the chlorine-containing resin in the rotary kiln is mixed with the chlorine-containing resin in the rotating rotary kiln,
The chlorine-containing resin is uniformly and efficiently heated, and dispersed in the chlorine-containing resin to suppress fusion and agglomeration of resin materials, thereby improving the dechlorination efficiency.

As the solid heat medium, a granular material such as sand may be used, but the resin pyrolysis residue after dechlorination is not separated from the solid heat medium in a furnace such as a blast furnace (especially, In the case of supplying to a furnace such as a blast furnace (particularly a melting furnace) when supplying the resin pyrolysis residue in which the solid heating medium still remains after the solid heating medium separation step 7 to the melting furnace) As the medium, it is preferable to use a material that can be used as a raw material for a furnace, specifically, a powder or granular material that can be used as an iron source, an iron source reducing agent, a fuel, an auxiliary raw material, etc. of the furnace.
As a result, the resin pyrolysis residue containing the solid heat medium as described above can be directly supplied to the melting furnace or the like as a reducing agent of the iron source or a fuel.

Examples of powders and granules suitable for such a solid heat medium include powder coke, powder ore, sintered powder (sintered ore powder and granules), and granular thermosetting resin. More than one species can be used as the solid heat carrier.

The gas generated in the dechlorination treatment step 4 using the rotary kiln as described above includes hydrogen chloride and organic components (light hydrocarbons, benzene, toluene, tar, etc.) generated by thermal decomposition of the plasticizer and the like. The generated gas is sent to the gas combustion step 5 to remove the organic component, and the organic component in the generated gas is burned.
In this gas combustion step 5, the organic components in the generated gas are almost completely burned, and the organic substances that reduce the purity of the recovered hydrochloric acid are removed.

In the gas combustion step 5, a gas combustion furnace is generally used, but it is necessary to burn at a high temperature in order to prevent the generation of harmful components such as dioxins. Further, although air is used for combustion, it is also possible to use air enriched with oxygen in consideration of an increase in the amount of gas generated after combustion. In that case, the temperature inside the gas combustion furnace may become higher than a predetermined temperature.In this case, in order to lower the temperature, dilute hydrochloric acid generated during the hydrochloric acid recovery process, exhaust gas after chlorine recovery, boiler heat, etc. It is also possible to blow a part of the exhaust gas containing hydrogen chloride after the recovery.

The generated gas that has passed through the gas combustion step 5 is sent to a hydrochloric acid recovery step 6 using a hydrogen chloride absorption tower or the like, and hydrogen chloride in the generated gas is recovered as hydrochloric acid. As described above, the chlorine-containing resin to be dechlorinated is sufficiently dried in the previous step, and the generated gas generated in the dechlorination is almost completely free of organic components in the gas combustion step 5. Therefore, in this hydrochloric acid recovery step 6, a high concentration (usually a concentration of 35% or more) that is sufficiently usable for industrial purposes,
High quality hydrochloric acid can be recovered.

On the other hand, the resin thermal decomposition residue produced in the dechlorination treatment step 4 is separated into the solid heat medium in the solid heat medium separation step 7. Since the film-like chlorine-containing resin is softened / dechlorinated by heating and finely pulverized, the solid heat medium separation step 7 can be easily performed. This solid heat medium separation step 7 is generally carried out using a sieve, but it is also possible to perform separation separation by trommel or wind power. In some cases, as described above, without separating the solid heat medium from the resin thermal decomposition residue (that is, without passing through the solid heat medium separating step 7), as it is or after passing through the crushing treatment step 8, It can also be supplied to a melting furnace or the like as an iron source reducing agent or fuel.

The solid heat medium separated in the solid heat medium separation step 7 is usually reused in the dechlorination step 4 and thus supplied to the rotary kiln in the dechlorination step 4.
The resin pyrolysis residue from which the solid heat medium has been separated is crushed to a particle size suitable for the form of utilization in the crushing process 8, for example, a particle size suitable for the iron reducing agent and fuel in the melting furnace, and provided for each use. . Further, part or all of the resin pyrolysis residue can be reused as a solid heat medium.

As described above, the film-form chlorine-containing resin is dechlorinated and the hydrochloric acid and the resin thermal decomposition residue are recovered. As described above, the film-shaped chlorine-containing resin is crushed to a size that can be supplied to the rotary kiln in the crushing process before performing the drying process, but since the crushed diameter affects the drying process and the volume reduction process, The film-form chlorine-containing resin is preferably crushed to a crushed diameter of 30 to 80 mm.
The crushing diameter is specified by the diameter of the screen of the crusher at the time of crushing.

The dryer is mainly of a type in which the material to be treated is agitated and dried uniformly, and the film-like chlorine-containing resins may be entangled with each other during the drying to form a thick string-like aggregate. Crushing diameter of film-like chlorine-containing resin is 60m
If it exceeds m, this tendency of string formation appears, but it is possible to prevent string formation by drying while loosening the film-like chlorine-containing resin by attaching a hook-shaped hook in the dryer. However, when the crushed diameter of the film-like chlorine-containing resin exceeds 80 mm, for example, the diameter of 20 to 30
Since a large number of thick cord-shaped aggregates having a length of 30 mm and a length of 30 to 50 cm are formed, the thick cord-shaped aggregates are entangled in the screw feeder during the volume reduction process, which causes overload and reduces It becomes impossible to carry out the capacity treatment. Moreover, when the crushing treatment for crushing the film-like chlorine-containing resin to a crushing diameter of less than 40 mm is performed, particles having a particle diameter of about several mm are formed at the same time, so these may fall off from the blower port of the dryer, etc. Yield tends to decrease. In particular, if the particle size of the film-like chlorine-containing resin is less than 30 mm, not only the yield further decreases, but also the volume cannot be sufficiently reduced, and the strength of the film-like chlorine-containing resin after volume reduction tends to decrease. There is. Therefore, the film-like chlorine-containing resin should be crushed to a diameter of 30
It is preferable to crush to -80 mm, especially 40 to 60 mm.

In the present invention, it is possible to prevent the material to be treated from containing a certain amount of resins other than the chlorine-containing resin, a composite material of the chlorine-containing resin and another material, and a material other than the resin. Further, it does not prevent that the film-shaped chlorine-containing resin contains a certain amount of solid chlorine-containing resin.

There is no particular limitation on the thickness of the film-like chlorine-containing resin referred to in the present invention, but it is not only an ultrathin material such as a film but also a relatively thick material such as used for agricultural vinyl sheets. Films can also be included.
On the other hand, solid chlorine-containing resin is a resin material having a relatively shape-retaining property other than the film-like chlorine-containing resin (for example,
Plate, pipe, etc.). However, whether to classify the resin material into a film-like chlorine-containing resin or a solid chlorine-containing resin depends on the composition of the resin material in addition to the thickness of the resin material itself.
It may be determined in consideration of the material, water content, etc.

[0030]

[Examples] Film-form chlorine-containing resins such as agricultural vinyl sheets collected as plastic waste (moisture content: 20 mass%, chlorine content: 30 mass%,
Inorganic component content: 10 mass%) was supplied to the treatment facility at a supply rate of 750 kg / h. The film-like chlorine-containing resin was crushed by a crushing device, and a sieve with a diameter of 60 mm (crushing diameter of 60 mm) was dried in a drier to obtain a water content of 5 ma.
After drying to ss%, it was transferred to the raw material supply feeder of the raw material supply device. The drying treatment in the dryer was performed at a temperature of 120 ° C. or lower at which the film-like chlorine-containing resin was not softened. The bulk density after drying was 0.05 g / cc. Next, the film-form chlorine-containing resin was volume-reduced by the raw material supply feeder (screw feeder) of the raw material supply device. The film-like chlorine-containing resin has a bulk density of 0.25 to 0.3 due to the heating of the heater and the generated frictional heat.
The volume was reduced to g / cc. The film-like chlorine-containing resin after volume reduction was in the form of lumps having a diameter of about 30 to 40 mm and had a substantially constant shape without overloading the screw feeder. In addition, hydrogen chloride gas was hardly generated during the volume reduction treatment.

From the raw material supply device, the volume-reduced film-shaped chlorine-containing resin is used as a solid heat medium (powder coke, water content:
5 mass%) was supplied to a rotary kiln together with 250 kg / h for dechlorination treatment. In addition, nitrogen is used as a carrier gas in the rotary kiln at 300 Nm ³ /
Aeration was performed at a flow rate of h (N indicates a standard state).

The treatment conditions in the rotary kiln are such that the temperature of hot air blown from the hot air generator is 410 ° C. so that the exhaust gas temperature of the kiln is 325 ° C. in order to minimize the generation of decomposition products such as tar. The hot air volume to 15
It was adjusted to 900 Nm ³ / h. In the dechlorination treatment carried out under these conditions, when the residence time of the chlorine-containing resin in the kiln was set to 40 to 60 minutes, the resin pyrolysis residue that did not substantially contain chlorine could be discharged. The composition of the evolved gas at this time is as follows: hydrogen chloride: 29.63 vol%, lower hydrocarbon (methane to butane): 0.60 vol%, water content: 1
0.85 vol%, benzene and toluene: 0.4 vo
It was 1%.

This generated gas was supplied to a gas combustion furnace to burn organic components in the gas. In this gas combustion furnace, coke oven gas was used as the fuel and air was used as the combustion-supporting gas, and the gas temperature was adjusted to 1300 ° C. to completely burn the organic components in the generated gas. The amount of gas after combustion is 4500N
It was m ³ / h. The gas after this combustion treatment is introduced into a hydrogen chloride absorption tower / distillation tower to recover hydrochloric acid, and a high concentration (HC
(1 concentration: 35%), it was possible to efficiently recover high-quality hydrochloric acid.

Same as above, but with a water content of 2
When the volume-reducing treatment was performed without drying the 0 mass% film-like chlorine-containing resin, the bulk density was 0.1
The amount was 0.2 g / cc, and the shape of the film was not stable even after the volume reduction treatment. When the heater used in the volume reduction treatment was made to have a high output so that the portion of the film remained as it was, hydrogen chloride gas was generated during the volume reduction treatment.

In the same manner as above, the water content of the film-like chlorine-containing resin was changed and the volume reduction degree (volume density) after the volume reduction treatment was examined. density)
It was found that the water content increased as the water content decreased, was almost saturated at 10 mass%, and showed a volume reduction degree equivalent to 0 mass% at 5 mass%. Therefore, it was found that it is effective to set the water content of the film-form chlorine-containing resin to 10 mass% or less, preferably 5 mass%.

[0036]

As described above, according to the present invention, the operation of the volume reduction treatment is stable, and the chlorine-containing resins can be dechlorinated without generating hydrogen chloride gas in the volume reduction treatment step. It can be done efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a processing flow of a chlorine-containing resin showing an embodiment of the present invention.

[Explanation of symbols]

1: crushing process step, 2: Drying process, 3: Volume reduction processing step, 4: Dechlorination process, 5: Gas combustion process, 6: hydrochloric acid recovery step, 7: solid heat medium separation step, 8: Crushing process

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Iemoto             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Tsukasa Ogawa             1-1 Minamiwata-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa             Nippon Steel Tube Co., Ltd. Keihin Steel Works Plastic             Kawasaki Branch Office F-term (reference) 3K078 AA05 BA01 BA26 CA01                 4D004 AA08 AB06 AB07 BA10 CA04                       CA24 CA29 CB09 CB13 CB36                       DA03 DA09 DA20                 4F301 AA17 CA09 CA24 CA26 CA33                       CA36 CA41 CA52 CA64 CA68

Claims (2)

[Claims] 1. A step of drying a film-shaped chlorine-containing resin,
A softening or melting or semi-melting of the film-like chlorine-containing resin that has gone through the step, and a volume-reducing treatment step of reducing the volume by solidifying, and the chlorine-containing resin that has gone through the step in a rotary kiln together with a solid heat medium. The chlorine-containing resin is thermally decomposed by supplying and heating it, and the chlorine-containing resin is separated into a generated gas containing hydrogen chloride and a resin thermal decomposition residue from which chlorine has been removed. Chlorine-containing resins having a gas combustion step of burning the generated gas containing the generated hydrogen chloride to remove an organic component contained in the generated gas, and a hydrochloric acid recovery step of recovering hydrogen chloride from the generated gas that has passed through the step 5. The method for treating chlorine-containing resins according to the method, wherein the water content of the chlorine-containing resins is dried to 10% or less in the drying step. 2. A crushing treatment step of crushing the film-like chlorine-containing resin is provided as a pre-step of the drying step of the film-like chlorine-containing resin, and the crushing diameter of the crushing treatment step is from 30 to 30.
The method for treating chlorine-containing resins according to claim 1, wherein a film-like chlorine-containing resin crushed to 80 mm is used.