JP3482830B2 - Treatment of chlorine-containing resin - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a treatment method for dechlorinating a chlorine-containing resin using a rotary kiln.

[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. In particular, plastics, which are high-molecular hydrocarbon compounds, generate a large amount of heat when they are burned, and when incinerated in a general incinerator, they damage the furnace wall, etc., making mass treatment difficult, and most of them are landfills. The current situation is that they are dumped on land. However, dumping plastic etc. is not preferable in terms of environmental measures,
In addition, recently, the shortage of land for landfill is becoming a social problem, and therefore, there is a strong demand for the development of a large-scale processing method for synthetic resins that does not rely on dumping.

Against this background, a method of using a synthetic resin such as plastic as an auxiliary fuel for a blast furnace or a reducing agent for an iron source is disclosed in, for example, JP-B-8-507105 and JP-B-51-33493. Is shown in. However, it is said that about 15% of chlorine-containing resins such as vinyl chloride are contained in waste synthetic resins on average, and when such synthetic resins are supplied to a blast furnace, etc. A large amount of harmful gas (hydrogen chloride gas) is generated due to thermal decomposition and combustion of resin, and harmful substances such as dioxins are generated, resulting in significant environmental pollution. Therefore, in order to prevent such a problem, it is necessary to separate the chlorine-containing resin from the synthetic resins in advance and remove the chlorine content (dechlorination treatment) from the chlorine-containing resin.

[0004] Conventionally, as a method for dechlorinating a chlorine-containing resin, there is known a method in which a chlorine-containing resin is heated using a rotary kiln to thermally decompose the resin so that chlorine is desorbed in the form of hydrogen chloride. ing.

[0005]

However, in this rotary kiln type dechlorination treatment method, the resin residue after pyrolysis adheres to the inner wall of the rotary kiln to significantly reduce the dechlorination efficiency, and the resin residue remains on the inner wall of the kiln. Adhesion,
There is a problem that it grows inoperable in a short time due to its growth.

In the dechlorination treatment of a chlorine-containing resin using a conventionally known single-tube rotary kiln, that is, a method of directly heating the chlorine-containing resin by flowing a heating gas inside the single-tube rotary kiln. , The generated hydrogen chloride is discharged to the outside of the furnace in a state where it is mixed with heating gas, and since this exhaust gas is huge, a large-scale facility for separating and removing hydrogen chloride from the exhaust gas is required. . Further, hydrogen chloride is characterized in that it exhibits high corrosiveness not only in a high temperature range exceeding 350 ° C but also in a temperature range of 150 ° C or lower. In the single-tube type rotary kiln as described above, the temperature of the inner wall surface of the refractory material forming the furnace wall is almost equal to the processing temperature, but the outside of the furnace wall is at room temperature, so the thickness direction of the refractory material is A temperature gradient occurs in the inner surface of the iron shell, and the dew point (150 ° C.) or less is reached in the vicinity of the inner surface of the iron shell. Therefore, hydrogen chloride that has penetrated into the refractory may corrode the iron shell or the like.

The present inventors have devised a new method for treating a chlorine-containing resin using an external heating type rotary kiln as described below with respect to such a problem. In this treatment method, the rotary kiln body is composed of an outer pipe and an inner pipe arranged inside the inner pipe, and the inside of the inner pipe serves as a passage for the material to be treated,
Using a rotary kiln with a space between the inner tube and the outer tube as a heating gas passage, the material to be treated containing the chlorine-containing resin and the solid heat medium (supplied in order to uniformly heat the material to be treated) The heating medium) is supplied, and the heating gas is supplied to the heating gas passage to heat the material to be treated in the passage for the material to be treated through the inner pipe to dechlorinate the chlorine-containing resin. Is the way.

According to this method, the generated hydrogen chloride gas can be taken out without being mixed with the heating gas,
Therefore, the equipment cost and the processing cost required for processing the exhaust gas can be significantly reduced as compared with the single-tube type rotary kiln. Also, since the entire inner tube that generates hydrogen chloride gas is heated by the heating gas, the temperature of the entire inner tube is maintained in a temperature range higher than the temperature range of 150 ° C or lower at which hydrogen chloride has strong corrosiveness. Therefore, there is an advantage that it is possible to appropriately prevent the corrosion of the device, particularly each part of the inner pipe, due to the generated hydrogen chloride.

However, in the dechlorination treatment of a chlorine-containing resin using such an external heating type rotary kiln, since the entire inner pipe forming the passage for the material to be treated is in a heated state, the resin residue on the inner wall of the kiln is not removed. There is a problem that adhesion and growth are particularly likely to occur. Conventionally, as a measure for preventing the resin residue from adhering to the inner wall of the rotary kiln, for example, a method of previously supplying oil to the inside of the kiln for processing is disclosed in Japanese Patent Laid-Open No. 50-1.
It is proposed in Japanese Patent No. 27981. However, in many cases, the supplied oil cannot maintain a stable state at the processing temperature, so the supplied oil adheres to the inner wall of the kiln by coking and reduces the heat transfer area. This leads to a decrease in chlorine efficiency. Further, oil that is stable at the dechlorination temperature is expensive, and there is a problem in terms of processing cost.

Therefore, an object of the present invention is to attach a resin residue to the inner wall of a kiln in a new dechlorination treatment method in which a chlorine-containing resin is treated using an external heating type rotary kiln having the above-mentioned specific structure. It is an object of the present invention to provide a method for treating a chlorine-containing resin capable of performing dechlorination treatment with high treatment efficiency while effectively preventing the above. Another object of the present invention is to provide a chlorine-containing resin that can be used as it is as a furnace raw material (fuel or pig source reducing agent) without separating the solid heat medium from the resin residue after dechlorination treatment. It is to provide a processing method.

[0011]

In order to solve these problems, the present inventors have studied factors affecting the adhesion of the resin residue to the inner wall of the kiln, and as a result, the solid heat of the material to be treated has been investigated. It has been found that the particle size ratio and the supply ratio (mixing ratio) of the medium are important, and by controlling these within a predetermined range, the adhesion rate of the resin residue to the inner wall of the kiln can be effectively reduced.

Further, from the viewpoint of using the resin residue after the dechlorination treatment as a raw material of the furnace as it is without separating it from the solid heat medium, as a result of investigating a material suitable for the solid heat medium, an iron source reducing agent, a fuel or a secondary substance It has been found that a powder or granular material that can be used as a raw material, for example , a powder or granular material such as coke or a thermosetting resin, can be an extremely suitable material as a solid heat medium. The present invention has been made based on these findings, and the features thereof are as follows.

[1] A material to be treated containing a chlorine-containing resin is supplied to a rotary kiln together with a solid heat medium and heated to thermally decompose the chlorine-containing resin to release chlorine components in the resin as hydrogen chloride, thereby removing chlorine. In the method of recovering the pyrolyzed resin residue, the rotary kiln body is composed of an outer pipe and an inner pipe arranged inside, and the inner pipe serves as a passage for the material to be treated, and a space between the inner pipe and the outer pipe is formed. Using a rotary kiln as a heating gas passage, while supplying a solid heat medium consisting of a material to be treated containing a chlorine-containing resin and a granular material to the passage for the material to be treated, and supplying a heating gas to the passage for the heating gas. A method for dechlorinating a chlorine-containing resin by heating a material to be treated in a passage for a material to be treated at 250 to 350 ° C., wherein a solid heat medium is a coke or a thermosetting resin.
The average particle diameter ratio of the material to be treated and the solid heat medium to be supplied to the passage for the material to be treated , which is made of one or more kinds of powder particles selected from [average particle diameter of material to be treated / average particle diameter of solid heat medium to be treated] Is A and the supply ratio [supply amount of the processed material / supply amount of the solid heat medium] in the weight ratio of the processed material and the solid heat medium is B, 0.5 ≦
A method for treating a chlorine-containing resin, comprising supplying a solid heat medium satisfying B ≦ 4.5 and satisfying the following expression (1) to dechlorinate a material to be treated.

[Formula 2]

[2] In the treatment method of the above-mentioned [1] , 80% by weight or more of the solid heat medium supplied has a particle diameter of 10 mm.
A method for treating a chlorine-containing resin, which is the following powdery or granular material. [3] The method for treating a chlorine-containing resin according to the above-mentioned treatment method [1] or [2], characterized in that the material to be treated is composed only of the chlorine-containing resin.

[0015]

In the present invention, the material to be treated may include resins other than chlorine-containing resin, composite materials of chlorine-containing resin and other materials, and materials other than resin. The powdery material used as the solid heating medium in the present invention means a powdery material, a granular material (fine-grained and / or coarse-grained granular material), or a mixture thereof. Further, in the present invention, the particle diameters of the material to be treated and the solid heat medium are defined as the diameter of the true circle when the cross-sectional area of the widest cross section of these objects is converted into the true circle. Further, the average particle diameter of the material to be treated and the solid heat medium means a harmonic average particle diameter.

[0017]

1 to 3 show an embodiment of a rotary kiln type dechlorination treatment apparatus used in the method of the present invention, in which the rotary kiln main body is arranged in an outer tube and inside thereof. The inner pipe serves as a passage for the material to be treated, and the space between the inner pipe and the outer pipe serves as a passage for the heating gas.

As described above, in the dechlorination treatment of the chlorine-containing resin using the rotary kiln having such a structure,
The generated hydrogen chloride gas can be taken out without being mixed with the heating gas, so that the facility cost and processing cost required for processing the exhaust gas can be significantly reduced as compared with the single-tube type rotary kiln. In addition, since the entire inner tube that generates hydrogen chloride gas is heated by the heating gas, the temperature of the entire inner tube is maintained at a temperature range higher than the temperature range of 150 ° C or lower at which hydrogen chloride has strong corrosiveness. Therefore, it is possible to appropriately prevent the corrosion of the device, particularly the inner pipe, by the generated hydrogen chloride gas.

In the rotary kiln shown in FIGS. 1 to 3, 1 is a rotary kiln main body, 2 is an outer tube constituting the same, 3 is an inner tube, and the inner tube 3 is an outer tube 2.
Are arranged substantially concentrically with the outer tube 2 in the inner longitudinal direction.
The inside of the inner pipe 3 constitutes a passage 4 (treatment space) for the material to be treated, and the space between the outer pipe 2 and the inner pipe 3 constitutes a passage 5 for heating gas.

Further, one end side of the inner pipe 3 forming the passage 4 extends to the outside of the outer pipe 2, and a fixed amount supply device 6, 7, 8 (screw) for material supply is provided on one end side of the inner pipe 3. A feeder or the like) is connected to the other end of the inner pipe 3, and a treated material and an exhaust gas discharge device 9 are connected to the other end of the inner pipe 3. This discharge device 9 has a recovery material recovery box 10 at the lower part and an exhaust gas discharge port 1 at the upper part. Further, a hot air supply port 12 for supplying a heating gas (hot air) is provided at one end side of the outer tube 2 forming a passage 5 with the inner tube 3, and a heating gas supply port 12 is provided at the other end side thereof. Discharge ports 13 are provided respectively. In the other drawings, reference numeral 14 is a drive motor for each fixed quantity supply device.

Further, FIGS. 4 and 5 show other structural examples in which the structure of the inner pipe and the like is different, whereas in FIGS. 1 to 3, the structure in which a single inner pipe is arranged inside the outer pipe is shown. , Outer tube 2
A plurality of inner pipes 3a to 3c are provided inside. In addition,
The number of inner tubes 3 arranged in the outer tube 2 is arbitrary. In such a structure, since a plurality of inner tubes are provided, the heat transfer area is increased accordingly, and therefore, there is an advantage that heat can be efficiently transferred from the heating gas flowing through the passage 5 into the inner tube.
For example, the mixing ratio and type of the material to be treated and the solid heat medium can be changed for each inner tube. Further, FIG. 6 shows another configuration example, in which the gas conduit 15 is arranged inside the inner pipe 3 so that the heating efficiency of the material to be treated can be further enhanced. Note that such a gas conduit is shown in FIGS.
It can also be arranged in the inner tubes 3a to 3c of the device.

In the rotary kiln of FIGS. 1 to 6 described above, dechlorination of the material to be treated can be carried out without any problem as long as the inner tubes 3, 3a to 3c are substantially rotated in the circumferential direction. You can Therefore, in each of the rotary kilns described above, the entire rotary kiln body 1 including the outer tube 2 may be configured to be rotatable in its circumferential direction.
As shown in FIG. 1, only the inner pipe 3 may be rotatable in its circumferential direction. Further, in the case of the rotary kiln of FIGS. 4 and 5, the inner pipes 3a to 3c are integrally rotated (thus, in this case, as in the case of rotating the rotary kiln body 1, each inner pipe is eccentrically rotated). Alternatively, the inner tubes 3a to 3c may be individually rotated.

In the rotary kiln shown in FIGS. 1 to 6, the material to be treated and the solid heat medium are introduced into the passage 4 through at least one of the constant quantity supply devices 6, 7 and 8 (the constant quantity supply device 6 in this embodiment). In addition to being supplied, heating gas is supplied from the hot air conduit 12 into the passage 5. The material to be treated and the solid heat medium may be mixed in advance and then supplied into the passage 4, or both may be separately supplied into the passage 4. The heating gas supplied to the passage 5 is supplied to the inner pipe 3,
The whole of 3a to 3c is heated, and the material to be treated is heated through the tube wall. The heating gas flowing through the passage 5 is discharged from the discharge port 13.

On the other hand, the material to be treated and the solid heat medium supplied to the passages 4 inside the inner tubes 3, 3a to 3c are the inner tubes 3, 3a to 3c.
The mixture is rotated by the rotation of c and is heated while being transferred in the passage 4. By this heating, the chlorine component in the chlorine-containing resin contained in the material to be treated is desorbed as hydrogen chloride, and hydrogen chloride gas is generated. The exhaust gas containing the hydrogen chloride gas, the pyrolysis resin residue after the dechlorination treatment and the solid heat medium are discharged to the discharge device 9, of which the exhaust gas is discharged from the exhaust gas discharge port 11 in the upper part, and the resin residue and the solid heat are discharged. The medium is collected in the collection box 10 through the lower outlet. Therefore, the hydrogen chloride gas generated by heating the chlorine-containing resin is recovered without being mixed with the heating gas flowing through the passage 5.

The heating temperature of the material to be treated in the kiln (in the passage 4) is 250 to 350 ° C., preferably around 300 ° C.
And If the heating temperature is lower than 250 ° C, the desorption reaction of hydrogen chloride is not efficiently performed, while if it exceeds 350 ° C, thermal decomposition of the resin material into gaseous and liquid hydrocarbons begins to occur. Since the material to be processed is smoothly moved in the passage 4, a small amount of carrier gas (for example, an inert gas such as nitrogen, helium, or argon) can be passed through the passage 4. Further, the material to be treated and the solid heat medium may be supplied to the rotary kiln body 1 by using different supply devices (arbitrary supply devices of the constant amount supply devices 6, 7, and 8).

In the dechlorination treatment using the rotary kiln having the above structure, the heating gas flows outside the inner pipes 3, 3a to 3c in which hydrogen chloride is generated, so that the entire inner pipe is heated to 250 to 350 ° C. Since the temperature is about the same, there is no temperature region below 150 ° C. where the corrosive action of hydrogen chloride is large, at the portion in contact with hydrogen chloride gas. Therefore, the corrosion of the furnace wall and the like due to the hydrogen chloride gas, in particular, the corrosion of each part of the inner pipe is appropriately prevented. Further, in each of the embodiments shown in FIGS. 1 to 6, the transport direction of the material to be treated and the heating gas supply direction (gas flow direction) are the same, but the heating gas supply direction (gas It is also possible to set the flow direction) to be opposite to the transfer direction of the material to be processed (gas counterflow method), which enables more efficient heating of the material to be processed.

In the present invention, in the dechlorination treatment of the chlorine-containing resin using the rotary kiln having the above-mentioned specific structure, the material to be treated to be supplied to the passage 4 (the material to be treated is substantially the chlorine-containing resin). In the case of being composed of only the chlorine-containing resin material) and the average particle diameter ratio of the solid heat medium composed of the powdery material [the average particle diameter of the material to be treated / the average particle diameter of the solid heat medium] is A,
When the supply ratio [supply amount of the processed material / supply amount of the solid heat medium] in the weight ratio of the processed material and the solid heat medium is B, 0.
Satisfies 5 ≦ B ≦ 4.5, perform dechlorination of the material to be treated by and supplying solid heat medium so as to satisfy the following formula (1).

[Equation 3]

FIG. 7 shows various changes in the average particle diameter ratio A of the material to be treated and the solid heat medium supplied to the passage 4 for the material to be treated and the supply ratio B (weight ratio) of the material to be treated to the solid heat medium. , The result of examining the effect of these on the adhesion rate of the resin residue to the inner wall of the kiln (= {[amount of resin residue adhered to the inner wall of the kiln] / [amount of resin material supplied to the kiln]} × 100) ( The result of a 10-hour continuous test) is shown. According to this, the adhesion of the resin residue to the inner wall of the kiln depends on the average particle size ratio A and the supply ratio B of the material to be treated and the solid heat medium, and satisfies B ≦ 4.5,
Further, when B ≧ 0.5, the adhesion rate of the resin residue to the inner wall of the kiln is suppressed to 10% or less (the range of the adhesion rate that is allowable in actual operation) in the range satisfying the above expression (1). .

Here, in the case where B ≧ 0.5, the adhesion rate of the resin residue can be suppressed to a low level in the range satisfying the above expression (1) because the average particle size ratio A and the supply ratio B are in this range. Due to this, a state in which the powdery solid heat medium adheres to the periphery (surface) of the molten resin material and the resin material surface is covered with the powdery solid heat medium (such as the resin material being sprinkled with the solid heat medium This is because the state) is likely to occur. At the same time, direct contact and adhesion between the resin materials are also suppressed, so that it is also suppressed that the resins are fused and agglomerated.

On the other hand, in the range of B> 4.5, the supply amount of the solid heat medium is insufficient with respect to the supply amount of the material to be treated, so the surface of the resin material should be sufficiently covered with the solid heat medium. Therefore, the resin residue adhesion rate increases. On the other hand, in the range of B <0.5 is sufficiently large supply amount of solid heat medium to the feed amount of the material to be treated, the adhesion rate of no resin residue committed to average particle size ratio A is suppressed et al is low, this B <
In the range of 0.5, the supply amount of the solid heat medium greatly exceeds the supply amount of the material to be treated, which may impair the economical efficiency of the treatment.
Therefore, from the viewpoint of economy, it is preferable to supply the solid heat medium in the range of B ≧ 0.5. From the above reasons
Clearly, 0.5 ≦ B ≦ 4.5 is satisfied, and the above (1)
The condition is to supply a solid heat medium to satisfy the equation.
And

Further, from the viewpoint of further improving the adhesion of the solid heat medium to the surface of the resin material and suppressing the agglomeration of the resin residue, 80% by weight or more of the solid heat medium supplied to the kiln is used. It is preferably composed of a powdery material having a particle diameter of 10 mm or less. In general, the materials to be treated as wastes (materials mainly containing chlorine-containing resin) have various shapes and sizes. Dechlorination is applied.

In the method of the present invention, the powdery solid heat medium to be supplied into the kiln together with the material to be treated is a furnace such as a blast furnace without separating the resin residue after dechlorination from the solid heat medium. (Especially from the viewpoint of supplying to the melting furnace)
That is, it is preferable to use a powder or granular material that can be used as an iron source reducing agent, a fuel, an auxiliary raw material, or the like. As a result, the residue of the resin material after the dechlorination treatment can be directly supplied to the melting furnace or the like as a reducing agent and a fuel for the iron source without being separated from the solid heat medium.

Examples of the powder and granules suitable for such a heat medium include coke and thermosetting resin (for example, phenol resin, urea resin) powder and granules, and one or more of them can be used as a solid heat medium. Ru can be used. Key in order to improve the solid heat significant segregation prevented by the workpiece heating efficiency of the medium in the Lun is, it is preferable as close as possible to the specific gravity of the heat medium to be processed resin material, also from this point of view
Arbitrary preferred to use a granular product coke or thermosetting resin as a solid heating medium.

It is also possible to separate the solid heat medium from the resin residue after the treatment and reuse this as the solid heat medium for a new treatment. Further, since the resin residue generated by the dechlorination treatment is mainly composed of carbon material, it can be used as a solid heat medium for new treatment as long as it meets the conditions of the present invention. Therefore, the resin residue and / or the solid heat medium discharged from the kiln outlet side can be appropriately circulated and used as the solid heat medium.

[0035]

EXAMPLE A chlorine-containing resin having a chlorine content of 43% by weight was dechlorinated by using the rotary kiln shown in FIGS. In this example, powder coke was used as the solid heat medium, and chlorine-containing resin was 2 kg / h as the material to be treated,
A solid heat medium was supplied at a supply ratio shown in Table 1 with respect to the supply amount of the material to be treated, and dechlorination treatment was carried out for 10 hours. In addition, the passage 4 for the material to be processed of the rotary kiln body 1
A small amount of an inert gas (carrier gas) was ventilated through.
The results of this example are shown in Table 1 together with the processing conditions such as the average particle size ratio and the supply ratio of the material to be treated and the solid heat medium.

The apparatus construction and usage conditions of the rotary kiln are as follows. Inner diameter of inner tube: 150mmφ × 1,500mmL Inner diameter of outer tube: 450mmφ × 1200mmL Inclination angle of the whole equipment: 2 ° Kiln rotation speed: 4rpm Processing temperature: Kiln Adjust the inner tube outlet temperature to 320 ° C

The dechlorination rate and the resin residue adhesion rate were calculated by the following equations. Dechlorination rate = (1- [Amount of chlorine in resin residue] / [Amount of chlorine in supplied chlorine-containing resin]) x 100 Resin residue adhesion rate = ([Amount of resin residue adhered to inner wall of kiln] / [Kirn Amount of resin material supplied to the inside]) x 100

[0038]

[Table 1]

As shown in Table 1, in the examples of the present invention, since the average particle size ratio A and the supply ratio B of the chlorine-containing resin and the solid heating medium satisfy the conditions of the present invention, the resin residue on the inner wall of the kiln is Adhesion was effectively suppressed, and no lumping (coarsening) of the resin residue was observed, and stable operation was possible. Further, the mixture of the resin residue after the dechlorination treatment and the coke powder which is the solid heat medium had properties and qualities which were sufficiently applicable as a blowing material for fuels such as blast furnaces and iron source reducing agents. On the other hand, in the case of the comparative example, the adhesion rate of the resin residue to the inner wall of the kiln was high, which hindered long-term operation.

[0040]

As described above, according to the method for treating a chlorine-containing resin of the present invention, while effectively preventing the resin residue from adhering to the inner wall of the kiln, the chlorine-containing resin can be dechlorinated at a high dechlorination rate. The treatment can be performed, and therefore, the efficient dechlorination treatment of the chlorine-containing resin can be stably performed for a long period of time.

Further, according to the method of the present invention, the generated hydrogen chloride can be taken out without being mixed with the heating gas, so that the facility cost and the processing cost required for processing the exhaust gas are greatly reduced as compared with the conventional method. Can be made. Further, since the entire inner pipe in which hydrogen chloride is generated is heated by the heating gas, the temperature of the entire inner pipe can be maintained in a temperature range higher than the temperature range of 150 ° C or lower at which hydrogen chloride has strong corrosiveness. Therefore, it is possible to appropriately prevent the corrosion of the device, particularly the inner pipe, due to the generated hydrogen chloride.

Further, since the powdery material which can be used as the raw material of the furnace is used as the solid heat medium, the resin residue after the completion of the dechlorination treatment is not separated from the solid heat medium and is used as it is in a blast furnace or the like. Can be supplied as a fuel, an iron source reducing agent, or the like to various furnaces (particularly, melting furnaces). Further, by using coke and / or thermosetting resin powder as the solid heat medium, segregation of the solid heat medium can be prevented more effectively, and therefore high treatment efficiency of dechlorination can be ensured. it can.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a rotary kiln type dechlorination treatment facility used in the method of the present invention.

FIG. 2 is a vertical sectional view of a rotary kiln according to the embodiment shown in FIG.

FIG. 3 is a cross-sectional view of the rotary kiln in the embodiment shown in FIG.

4 is a vertical cross-sectional view showing another structural example of the rotary kiln used in the embodiment shown in FIG.

5 is a cross-sectional view of the rotary kiln of FIG.

FIG. 6 is a cross-sectional view showing another structural example of the rotary kiln used in the embodiment shown in FIG.

FIG. 7 is a graph showing the dechlorination treatment of a chlorine-containing resin using a rotary kiln having the structure shown in FIGS. Graph showing the effect on rate

[Explanation of symbols]

1 ... Rotary kiln body, 2 ... Outer tube, 3, 3a, 3
b, 3c ... Inner tube, 4,5 ... Passage, 6,7, 8 ... Fixed amount supply device, 9 ... Ejection device, 10 ... Recovery box, 11 ... Exhaust gas exhaust port, 12 ... Hot air supply port, 13 ... Exhaust port, 14 ... Drive motor, 15 ... Gas conduit

Continuation of the front page (56) Reference JP-A-7-316339 (JP, A) JP-A-48-65280 (JP, A) JP-A-53-60974 (JP, A) JP-A-50-127981 (JP , A) JP-A-51-36287 (JP, A) JP-A-53-101074 (JP, A) JP-A-48-65280 (JP, A) JP-B-47-34474 (JP, B1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) C08J 11/12 B09B 3/00

Claims (3)

(57) [Claims] 1. A material to be treated containing a chlorine-containing resin is supplied to a rotary kiln together with a solid heat medium and heated to thermally decompose the chlorine-containing resin to release chlorine components in the resin as hydrogen chloride to remove chlorine. In the method of recovering the pyrolysis resin residue, the rotary kiln body consists of an outer pipe and an inner pipe arranged inside, and the inner pipe serves as a passage for the material to be processed, and the space between the inner pipe and the outer pipe is heated. Using a rotary kiln as a gas passage, a solid heat medium consisting of a material to be treated containing a chlorine-containing resin and a granular material is supplied to the passage for the material to be treated, and a heating gas is supplied to a passage for the heating gas. A method for dechlorinating a chlorine-containing resin by heating a material to be treated in a passage for a treating material to 250 to 350 ° C., wherein a solid heat medium is selected from coke and thermosetting resin.
The average particle size ratio of the material to be treated and the solid heat medium to be supplied to the passage for the material to be treated , which is composed of one or more kinds of powder particles, is defined as [average particle diameter of material to be treated / average particle diameter of solid heat medium]. When A, the supply ratio [supply amount of the processed material / supply amount of the solid heat medium] in the weight ratio of the processed material and the solid heat medium is B, 0.5 ≦ B ≦ 4.5 is satisfied. And the following (1)
A method for treating a chlorine-containing resin, comprising supplying a solid heat medium satisfying the formula to dechlorinate a material to be treated. [Equation 1] 2. The method for treating a chlorine-containing resin according to claim 1, wherein 80% by weight or more of the solid heat medium supplied is a powder or granular material having a particle diameter of 10 mm or less. 3. The method for treating a chlorine-containing resin according to claim 1, wherein the material to be treated is made of only a chlorine-containing resin.