JPH09291290A - Plastic treating apparatus and apparatus for converting plastic into oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for making a waste plastic into an oil, capable of separating a phthalic acid-based plasticizer the waste plastic and dechlorinating the waste plastic. SOLUTION: This apparatus 30 for melting a vinyl chloride resin-containing waste plastic/decomposing it/making it into an oil is equipped with a first heating and melting part 60 for heating and melting at 200-270 deg.C to decompose a phthalic acid-based plasticizer but not a vinyl chloride resin and a second heating and melting part 70 for heating and melting, the waste plastic heated and melted by the first heating and melting part 60, at 280-300 deg.C to decompose the vinyl chloride resin but not the waste plastic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic processing apparatus and a plastic oiling processing apparatus for melting and thermally decomposing plastic and recovering it as an oil component, and in particular, components other than carbon and oil components such as additives contained in the plastic. To remove.

[0002]

2. Description of the Related Art The thermal decomposition method is known as the most general oil treatment method for waste plastics. In this method, waste plastic is put into a heating tank, heated to, for example, about 450 ° C. to form a decomposed gas, which is condensed by a condenser and recovered as a liquid oil.

The thermal decomposition method has the following problems. That is, PV in waste plastic
When C is mixed, PVC releases chlorine with hydrogen around 300 ° C., so that hydrochloric acid gas is generated and mixed in the produced oil. When the produced oil mixed with hydrochloric acid gas is burned, harmful dioxin may be generated. For this reason, PVC is selected and eliminated before the waste plastic is put into the waste plastic oiling device to reduce the mixing rate of hydrochloric acid gas in the produced oil. But P
Most of the sorting work of VCs is performed manually, and a processing device that does not require manual sorting is awaited. In the present specification, the decomposed gas means a gas produced by decomposing plastic, and the hydrochloric acid gas means a gas produced by decomposing vinyl chloride.

On the other hand, since plastic has a low thermal conductivity, even if it is heated in the heating tank, it is melted only in the vicinity of the portion in contact with the wall surface of the tank and the portion away from the heat source is not melted as a solid, so that the decomposition efficiency is poor. There was a problem.

In order to solve these problems, an extruder is disclosed in Japanese Patent Laid-Open No. 5-245463. The extruder has a screw coaxially installed inside the cylinder that is used for extrusion molding of waste plastic, and performs dechlorination while continuously heating the waste plastic supplied from the supply port. ,
It has the function of discharging from the discharge port. With this extruder, PVC is heated at about 300 ° C. to perform dechlorination treatment in advance, and then the waste plastic is pyrolyzed. Further, this extruder has an advantage that the plastic can be efficiently heated because the plastic can be always kept in a molten state.

FIG. 13 is a diagram showing an outline of a general continuous waste plastic oiling apparatus 10 for carrying out a thermal decomposition method. That is, the waste plastic is put into the hopper 11 after being subjected to pretreatment such as crushing and metal separation by a pretreatment device (not shown). Next, the waste plastic is sent from the hopper 11 to the dechlorinator 13 by the charging mechanism 12 in an amount corresponding to the amount of decomposition.

In the dechlorination unit 13, the waste plastic is melted at, for example, about 350 ° C. to remove chlorine contained in the mixed vinyl chloride. The removed chlorine is hydrochloric acid production tower 14
Recovered as hydrochloric acid. On the other hand, the dechlorinated waste plastic is melted in the melting tank 15, and then the decomposition tank 1
Sent to 6. In the decomposition tank 16, the waste plastic is heated to, for example, about 450 ° C. and thermally decomposed to generate decomposition gas. The heating is performed from the outside of the decomposition tank 16 with an electric heater or a heavy oil burner. The cracked gas generated in the cracking tank 16 is sent to the fractionation tower 17 and fractionated into heavy oil, medium oil, and light oil. Finally, the residue remaining in the decomposition tank 16, that is, the decomposed residue in which many carbons are solidified, is removed. The residue is not decomposed anymore and is normally incinerated.

In order to operate the dechlorinating apparatus 13 efficiently, it is necessary to crush waste plastic into, for example, about 10 mm square and then put in a fixed amount. Usually 10 mm
A screw feeder or a circle feeder is often used to supply a certain amount of granules. The screw feeder is for feeding powder particles by screw feeding, and the circle feeder 20 is a bottomed container for the granular plastic waste P overflowing from the bottom of the cylindrical tank 21 as shown in FIG. 22. The waste plastic P in the container 22 is scraped off by the blades 23 and dropped from the discharge port 24 downward.

[0009]

The conventional waste plastic oiling apparatus described above has the following four major problems.

The first problem is the processing of plasticizers in dechlorination equipment. That is, a soft PVC typified by an agricultural PVC sheet is usually mixed with a large amount of a plasticizer. A typical plasticizer for PVC is a phthalic acid plasticizer such as dioctyl phthalate (hereinafter referred to as "DOP"). Phthalic acid plasticizers account for nearly 85% of the total production of plasticizers in Japan.

When the phthalic acid type plasticizer is heated,
Phthalic anhydride is produced at around 270 ° C. For this reason,
In the dechlorination unit 13, the hydrochloric acid gas and the vapor phase phthalic anhydride are simultaneously separated and sent to the hydrochloric acid production tower 14. Phthalic anhydride has the property of crystallizing white crystals from the gas phase at around 130 ° C when the temperature decreases. For this reason, crystals of phthalic anhydride precipitate in the pipe from the dechlorination unit 13 to the hydrochloric acid production tower 14 and block the pipe, or the hydrochloric acid production tower 1
There was a problem that periodical and frequent cleaning of the inside of No. 4 became indispensable. In addition, there is a problem that the equipment and man-hours for extracting phthalic acid from hydrochloric acid increase.

The second problem is a problem in the input mechanism. That is, when the waste plastic is crushed in the pretreatment step, its bulk density is approximately 0.3 to 0.1 g / cm ^3.
Becomes Moreover, since the vinyl sheet is compressed due to wrinkles, it may have a bulk density of 0.1 or less. When it is attempted to supply such waste plastic with a screw feeder, the waste plastic may be compressed and the density may be increased, resulting in the supply failure. For example, diameter 80mm, screw pitch 65mm
The transfer was attempted with the screw No., but stable transfer was impossible.

Further, in the circle feeder 20 as shown in FIG. 14, since the waste plastic is scraped out from the lower portion of the large cylindrical tank 21, the waste plastic bridge is likely to occur inside the tank 21. For example, 17
An attempt was made to eject using a circle feeder having a discharge port 23 of 0 × 270 mm, but it was impossible to eject because a strong bridge was formed inside.

Further, in these charging mechanisms, the hydrochloric acid gas generated in the dechlorination unit 13 is charged from the charging port into the charging mechanism 12.
There was also the problem of flowing back to the side and being released into the atmosphere.

The third problem is the problem of dechlorination efficiency in the dechlorination unit 13. That is, in the screw used in the dechlorination device 13, the groove has a constant depth from the base end to the tip. Table 1 shows an example of dechlorination using such a screw. The dechlorinated waste plastics are PVC (DOP-free and 26% -containing) and polypropylene equivalent mixture.

[0016]

[Table 1]

The dechlorination rate in the dechlorination unit 13 is 90%.
If more than a certain degree is required, the dechlorination rate by such a screw is insufficient.

The following causes can be considered. That is, the waste plastic transferred by the screw is in the liquid phase. However, since the melted waste plastic has a high viscosity, it is hard to be stirred in the groove, and heating progresses in the portion in contact with the inner wall of the cylinder, but it is difficult to heat in the portion in contact with the shaft of the screw. As a result, the efficiency of decomposition is reduced.

Although the dechlorination rate is improved by raising the temperature, it is impossible to treat the waste plastic at a temperature of 350 ° C. or higher because the waste plastic is decomposed and oiled at 350 ° C. or higher. Further, although the dechlorination rate is improved over time, the processing capacity is lowered as it is, resulting in an increase in the size of the device and a rise in the manufacturing cost of the device.

In view of the above problems, the present invention provides
After separating the phthalate plasticizer contained in vinyl chloride,
It is an object of the present invention to provide a waste plastic oiling device capable of dechlorinating waste plastic.

Further, the present invention provides a waste plastic oiling device capable of stably feeding a fixed amount of waste plastic to the dechlorination device and preventing the hydrochloric acid gas generated in the dechlorination device from flowing backward to the feeding mechanism side. The purpose is to do.

Further, an object of the present invention is to provide a waste plastic oiling device capable of increasing the dechlorination rate in the dechlorination device.

[0023]

In order to solve the above problems and to achieve the object, the invention described in claim 1 heat treats a plastic such as vinyl chloride to thermally decompose chlorine and a plasticizer from the vinyl chloride. In the plastic processing apparatus having the function to perform, the first heating unit that heats at the first temperature at which the plasticizer is thermally decomposed from the plastic, and the chlorine is thermally decomposed from the plastic heated by the first heating unit. And a second heating unit for heating at a second temperature,
The first heating unit keeps this temperature at the first temperature, contains a container containing the plastic, a discharge pipe for discharging the gas generated in the container, and a temperature of the discharge pipe to a phthalic acid crystallization temperature or higher. A heating means for holding is provided.

The invention described in claim 2 is the invention described in claim 1, wherein the first temperature is 200 to 27.
The temperature was 0 ° C., and the second temperature was 280 to 300 ° C.

The invention described in claim 3 is a plastic processing apparatus comprising a dechlorination unit for thermally decomposing a plastic to separate chlorine, and a charging mechanism for charging the plastic into the dechlorination unit. A first opening / closing mechanism for supplying and storing the plastic;
A first accommodation chamber for accommodating the plastic supplied from the supply means, and a first door of the first accommodation chamber covering the first door, and when the first door is opened. A second storage chamber provided with a second door for opening and closing the plastic supplied from the first storage chamber, and a gas exchange unit for ventilating the gas in the second storage chamber with a dry gas. did.

[0026] In the invention described in claim 4, the dechlorinating portion for decomposing chlorine by thermally decomposing a plastic group containing vinyl chloride, and the decomposing portion, the oil group is thermally decomposed and taken out from the plastic group. In a plastic processing apparatus including an oil decomposition unit, the dechlorination unit has a cylinder having a supply port to which the plastic is supplied at one end side and a discharge port for discharging the plastic at the other end side, and a cylinder coaxial with the cylinder. And a screw for transferring the plastic in the cylinder toward the outlet while gradually increasing the pressure with respect to the plastic, and a heating unit for heating the plastic in the cylinder to a temperature at which chlorine is thermally decomposed. I was prepared.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, the screw is formed such that the depth of the groove portion thereof gradually becomes shallower toward the discharge port side of the cylinder. It was to so.

[0028] According to a sixth aspect of the invention, in the invention according to the fourth aspect, the screw is formed such that the width of the groove portion thereof becomes gradually narrower toward the discharge port side of the cylinder. I did it.

According to a seventh aspect of the invention, in the invention according to the fourth aspect, the screw is formed such that the pitch of the groove portion thereof becomes gradually narrower toward the discharge port side of the cylinder. I did it.

According to the invention described in claim 8, in the invention described in claim 4, the cylinder is formed such that the inner diameter thereof gradually decreases toward the discharge port side,
The screw is formed so that the outer diameter thereof gradually decreases toward the discharge port side.

According to a ninth aspect of the present invention, in a plastic oiling apparatus for melting, decomposing and oilizing a plastic containing vinyl chloride, dechlorination for thermally decomposing the vinyl chloride in the plastic to separate chlorine. Section and a plastic decomposing section for thermally decomposing the plastic from which the chlorine has been separated in the dechlorination section, the dechlorination section having a supply port to which the plastic is supplied at one end side and the other end side. A cylinder having a discharge port for discharging the plastic, and a cylinder which is arranged coaxially with the cylinder and whose outer diameter is formed along the inner wall of the cylinder and which supplies the plastic supplied to the supply port to the cylinder. A screw that transfers the plastic toward the discharge port and the plastic that heats the plastic in the cylinder. And a thermally decomposing heating unit of vinyl chloride in click, to the screw was set to projections for stirring the plastic is provided.

The invention described in claim 10 is a supply device for supplying a plastic, a dechlorination unit for recovering chlorine from the plastic supplied from the supply device, and a thermal decomposition of the dechlorinated plastic. In the plastic oil treatment apparatus including a thermal decomposition tank for recovering oil content, the dechlorination section heats the plasticizer from the plastic at a first temperature, and a first heating section that heats the plasticizer.
The second heating unit heats the plastic heated by the first heating unit at a second temperature at which the chlorine is thermally decomposed.

As a result of taking the above-mentioned means, the following actions will occur. That is, in the invention described in claim 1, in a plastic processing apparatus having a function of thermally treating a plastic such as vinyl chloride to thermally decompose chlorine and a plasticizer from the vinyl chloride, the plasticizer is thermally decomposed from the plastic. A first heating unit for heating at a first temperature and a second heating unit for heating at a second temperature at which the chlorine is thermally decomposed from the plastic heated by the first heating unit. The part is a container for keeping the temperature at the first temperature and containing the plastic, a discharge pipe for discharging the gas generated in the container, and a heating means for keeping the temperature of the discharge pipe at a phthalic acid crystallization temperature or higher. Since the waste plastic containing vinyl chloride is decomposed in the first heating section by the phthalic acid plasticizer and the vinyl chloride is not decomposed at the first temperature, Since so as to heat and melt, in the first heating portion of phthalic anhydride produced from phthalic acid plasticizers, hydrochloric acid gas is not generated from vinyl chloride. Also, heating at a second temperature where vinyl chloride is decomposed in the second heating section and waste plastic is not decomposed.
Since it was made to melt, hydrochloric acid gas is generated from vinyl chloride, but the waste plastic is not decomposed. Therefore, phthalic anhydride, hydrochloric acid gas, and plastic decomposition gas can be recovered separately.

According to the invention described in claim 2, in the invention described in claim 1, the first temperature is 200 to 270 ° C.
And the second temperature was set to 280 to 300 ° C.

The invention described in claim 3 is a plastic processing apparatus comprising a dechlorination section for thermally decomposing a plastic to separate chlorine, and a charging mechanism for charging the plastic into the dechlorination section. A first opening / closing mechanism for supplying and storing the plastic;
A first accommodation chamber for accommodating the plastic supplied from the supply means, and a first door of the first accommodation chamber covering the first door, and when the first door is opened. A second storage chamber provided with a second door for opening and closing the plastic supplied from the first storage chamber, and a gas exchange unit for ventilating the gas in the second storage chamber with a dry gas. did.

In the invention described in claim 4, the dechlorinating portion for thermally decomposing a vinyl group-containing plastic group to take out chlorine, and the thermally decomposing oil portion to be taken out from the plastic group passing through the dechlorinating portion are taken out. In a plastic processing apparatus including an oil decomposition unit, the dechlorination unit has a cylinder having a supply port to which the plastic is supplied at one end side and a discharge port for discharging the plastic at the other end side, and a cylinder coaxial with the cylinder. And a screw for transferring the plastic in the cylinder toward the outlet while gradually increasing the pressure with respect to the plastic, and a heating unit for heating the plastic in the cylinder to a temperature at which chlorine is thermally decomposed. I was prepared.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, the screw is formed such that the depth of the groove portion thereof gradually becomes shallower toward the discharge port side of the cylinder. It was to so.

In the invention described in claim 6, in the invention described in claim 4, the screw is formed such that the width of the groove portion thereof becomes gradually narrower toward the discharge port side of the cylinder. I did it.

According to a seventh aspect of the invention, in the invention according to the fourth aspect, the screw is formed such that the pitch of the groove portion thereof becomes gradually narrower toward the discharge port side of the cylinder. I did it.

According to an eighth aspect of the present invention, in the invention according to the fourth aspect, the cylinder is formed so that its inner diameter is gradually reduced toward the discharge port side.
The screw is formed so that the outer diameter thereof gradually decreases toward the discharge port side.

According to a ninth aspect of the present invention, in a plastic oiling device for melting, decomposing and oilizing a plastic containing vinyl chloride, dechlorination for thermally decomposing the vinyl chloride in the plastic to separate chlorine. Section and a plastic decomposing section for thermally decomposing the plastic from which the chlorine has been separated in the dechlorination section, the dechlorination section having a supply port to which the plastic is supplied at one end side and the other end side. A cylinder having a discharge port for discharging the plastic, and a cylinder which is arranged coaxially with the cylinder and whose outer diameter is formed along the inner wall of the cylinder and which supplies the plastic supplied to the supply port to the cylinder. A screw that transfers the plastic toward the discharge port and the plastic that heats the plastic in the cylinder. And a thermally decomposing heating unit of vinyl chloride in click, to the screw was set to projections for stirring the plastic is provided.

The invention described in claim 10 is a supply device for supplying plastic, a dechlorination unit for recovering chlorine from the plastic supplied from the supply device, and a thermal decomposition of the dechlorinated plastic. In the plastic oil treatment apparatus including a thermal decomposition tank for recovering oil content, the dechlorination section heats the plasticizer from the plastic at a first temperature, and a first heating section that heats the plasticizer.
The second heating unit heats the plastic heated by the first heating unit at a second temperature at which the chlorine is thermally decomposed.

As a result of taking the above-mentioned means, the following actions occur. That is, in the invention described in claim 1, the waste plastic containing vinyl chloride is heated in the first heating section at the first temperature at which the phthalic acid plasticizer is decomposed and vinyl chloride is not decomposed. Therefore, in the first heating section, phthalic anhydride is generated from the phthalic acid plasticizer, but hydrochloric acid gas is not generated from vinyl chloride. Further, since the second heating portion is heated at the second temperature at which vinyl chloride is decomposed and the waste plastic is not decomposed, hydrochloric acid gas is generated from the vinyl chloride, but the waste plastic is not decomposed. Therefore, phthalic anhydride, hydrochloric acid gas, and plastic decomposition gas can be recovered separately.

In the invention described in claim 2, the first temperature is 200 to 270 ° C. and the second temperature is 280 to 300.
Since it was made to be ℃, the first temperature is 200 ℃ ~ 270
C. and the second temperature is 280 to 300.degree. C., so that the phthalic acid plasticizer and vinyl chloride can be clearly separated.

According to the third aspect of the present invention, the waste plastic in the hopper can be put into the first storage chamber by a fixed amount by the rotary valve attached to the lower part of the hopper. In addition, a second storage chamber provided with a second damper is provided below the first storage chamber provided with the first damper, and a gas exchange unit for exchanging the gas in the second storage chamber with the dry gas is provided. Therefore, the waste plastic can be transferred from the first storage chamber to the dechlorination device without connecting the first storage chamber and the dechlorination device. Therefore, it is possible to prevent the gas generated in the dechlorination apparatus from being opened to the first storage chamber and the hopper side by replacing the gas in the second storage chamber with the exchange gas.

[0046] In the invention described in claim 4, the dechlorination part for decomposing chlorine by thermally decomposing the plastic group mixed with vinyl chloride, and the oil decomposing and decomposing oil from the plastic group passing through this dechlorination part are extracted. In a plastic processing apparatus including an oil decomposition unit, the dechlorination unit has a cylinder having a supply port to which the plastic is supplied at one end side and a discharge port for discharging the plastic at the other end side, and a cylinder coaxial with the cylinder. And a screw for transferring the plastic in the cylinder toward the outlet while gradually increasing the pressure with respect to the plastic, and a heating unit for heating the plastic in the cylinder to a temperature at which chlorine is thermally decomposed. Since the waste plastic can be stirred by applying a compressive force, It is possible to heat one, it is possible to increase the generation amount of hydrochloric acid gas.

In the invention described in claim 5, since the screw is formed such that the depth of the groove portion becomes shallower toward the discharge port side of the cylinder, the waste plastic can be compressed.

In the invention described in claim 6, since the screw is formed so that the width of the groove portion becomes narrower toward the discharge port side of the cylinder, the waste plastic can be compressed.

According to the invention described in claim 7, since the screw is formed so that the pitch of the groove portion becomes narrower toward the discharge port side of the cylinder, the waste plastic can be compressed.

In the invention described in claim 8, the cylinder is formed so that the inner diameter thereof becomes smaller toward the discharge port side, and the screw is formed so that the outer diameter thereof becomes smaller toward the discharge port side. The waste plastic can then be compressed.

In the invention described in claim 9, in the dechlorination section for thermally decomposing vinyl chloride in the plastic to separate chlorine, one end side is supplied with the waste plastic and the other end side is provided. A cylinder having a discharge port for discharging the waste plastic, and a cylinder disposed coaxially with the cylinder and having an outer diameter formed along the inner wall of the cylinder so that the waste plastic supplied to the supply port is discharged to the discharge port of the cylinder. It is equipped with a screw to transfer the waste plastic to the cylinder and a heating part that heats the waste plastic in the cylinder to pyrolyze the vinyl chloride in the waste plastic. The agitation of the waste plastic is promoted, the waste plastic can be heated uniformly, and It is possible to increase the amount of gas generated.

In the invention described in claim 10, a supply device for supplying plastic, a dechlorination unit for recovering chlorine from the plastic supplied from the supply device, and the dechlorinated plastic are thermally decomposed. In a plastic oil treatment apparatus equipped with a thermal decomposition tank for recovering oil, the dechlorination section uses a first heating section for heating at a first temperature at which the plasticizer is thermally decomposed from the plastic, and the first heating section. Since a second heating unit for heating at a second temperature at which chlorine is thermally decomposed from the heated plastic is provided, the phthalic acid plasticizer decomposes the waste plastic containing vinyl chloride in the first heating unit. In addition, since the heating is performed at the first temperature at which vinyl chloride is not decomposed, phthalic anhydride is generated from the phthalic acid-based plasticizer in the first heating section, but vinyl chloride Hydrochloric gas is not generated from the Le. Further, since the second heating portion is heated at the second temperature at which vinyl chloride is decomposed and the waste plastic is not decomposed, hydrochloric acid gas is generated from the vinyl chloride, but the waste plastic is not decomposed. Therefore, phthalic anhydride, hydrochloric acid gas, and plastic decomposition gas can be recovered separately, and at the same time, oil can be recovered.

[0053]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a waste plastic oiling apparatus 30 according to a first embodiment of the present invention. Further, FIG. 2 shows a waste plastic oiling device 30.
It is sectional drawing which shows the charging mechanism incorporated in. In these figures, the same functional parts as those in FIG. 13 are designated by the same reference numerals.

The waste plastic oiling device 30 includes a hopper 11 into which pre-processed waste plastic is input, and an input mechanism 40 for sending the waste plastic from the hopper 11 to a dechlorination device 50 described later in an amount corresponding to the decomposition amount. When,
A dechlorination device 50 for removing chlorine in vinyl chloride mixed in from the waste plastic input by the input mechanism 40, and a hydrochloric acid generation tower 14 for recovering the chlorine removed by the dechlorination device 50 as hydrochloric acid, A melting tank 15 for melting the waste plastic solution P from which chlorine has been removed by the dechlorination device 50, a decomposition tank 16 for thermally decomposing the waste plastic solution P introduced from the melting tank 15 and generating decomposition gas, and A fractionating tower 17 for fractionating the cracked gas generated in the cracking tank 16 into heavy oil, medium oil, and light oil is provided. The hydrochloric acid production tower 14 is a tower in which hydrochloric acid gas is brought into contact with water and recovered as concentrated hydrochloric acid, for example, by a wet wall tube of graphite.

As shown in FIG. 2, the charging mechanism 40 includes a rotary valve 41 provided under the hopper 11 and a first accommodating chamber 42 provided under the rotary valve 41.
And a second storage chamber 43 provided under the first storage chamber
And The rotary valve 41 rotates the valve body of a cylinder having a partition to rotate the hopper 1
It has a function to put a certain amount of waste plastic in 1. In addition, 11a in FIG. 2 is a bridge breaker. The bridge breaker 11a drives a 1 cm square wire mesh in the direction indicated by W in FIG.
By vibrating or swinging the waste plastic contained therein to secure the fluidity, a bridge is formed in the hopper 11 and the transportation of the waste plastic is prevented from being hindered.

Further, reference numeral 42a in FIG. 2 denotes a first damper that hermetically covers the bottom of the first storage chamber 42, and its opening / closing is drive-controlled by a closing mechanism control unit 48 described later. Reference numeral 43a in FIG. 2 denotes a second damper that hermetically covers the bottom of the second storage chamber 43, and the opening / closing operation of the second damper is drive-controlled by the closing mechanism control unit 48.

Further, a discharge port 44 is provided on the left side wall surface of the second storage chamber 43 in FIG. 2 and an exhaust pump 45 is connected thereto. Further, an N ₂ supply port 46 is provided on the right side wall surface in FIG. 2, and a gas supply device 47 for supplying an inert gas such as nitrogen is connected to the N ₂ supply port 46. The exhaust pump 45 and the gas supply device 47 constitute a gas exchange section that exchanges the gas in the second storage chamber 43.

In FIG. 2, reference numeral 48 is a closing mechanism control section (damper drive) for opening and closing the first damper 42a and the second damper 43a at the timing described later, and operating the bridge breaker 11a, the exhaust pump 45 and the gas supply device 47. Part) is shown. Note that FIG. 3 is a timing chart showing these operation timings.

The dechlorination apparatus 50 is the first extruder 60.
A first heating / melting section and a second extruder 70 (second heating / melting section) are provided. The first extruder 60 includes a cylindrical first cylinder 61, a first screw 62 coaxially arranged with the first cylinder 61, a motor 63 that rotationally drives the first screw 62, and a first cylinder. 61 and a heater 64 which is arranged around 61 and heats at 200 to 270 ° C.

Incidentally, reference numeral 61a in FIG.
Reference numeral 61b denotes a supply port disposed below the storage chamber 43, 61b denotes a discharge port for discharging the molten plastic waste, and 61c denotes a discharge port for discharging the separated vapor phase phthalic anhydride.
Further, the exhaust port 61c is connected to a phthalic acid recovery device 65 for recovering phthalic anhydride via a pipe 66. Further, a heater 67 for heating at 150 ° C. is provided around the pipe 66. That is, the pipe 66 is kept at a temperature at which phthalic acid does not crystallize. Phthalic acid recovery unit 6
5 is for recovering crystalline phthalic anhydride from the phthalic anhydride gas by, for example, washing with air. The discharge port 61b has a pipe 68 communicating with the supply port 71a of the second extruder 70.
Is connected.

The second extruder 70 has a cylindrical second cylinder 71, a second screw 72 arranged coaxially with the second cylinder 71, and a motor 73 for rotationally driving the second screw 72. The heater 74 is arranged around the first cylinder 71 and heats at 280 to 300 ° C. In FIG. 1, 71a is a supply port arranged below the discharge port 61b of the first cylinder 61, 71b is a discharge port for discharging molten waste plastic, and 71c is a discharge port for discharging separated hydrochloric acid gas. There is. The exhaust port 71c is connected to the hydrochloric acid production tower 14 via a pipe 75. Further, the melting tank 15 is connected below the discharge port 71b through a pipe 76. Piping 75 is SUS
It is made of highly corrosion resistant material such as 316 material.

The first screw 62 is shown in FIG.
As shown in, the depth of the groove portion 62a is formed to be constant. On the other hand, the second screw 72 is formed so that the depth of the groove 72a becomes shallower toward the discharge port 71b as shown in FIG. 4B, and the waste plastic extruded by the second screw 72 is compressed. , The compressive force is working.

In the waste plastic oiling apparatus 30 having the above structure, the waste plastic is oiled as follows.

That is, the waste plastic crushed into about 10 mm square is put into the hopper 11. The closing mechanism controller 48 operates the bridge breaker 11a and the rotary valve 41. The waste plastic given the fluidity by the bridge breaker 11a is sent to the rotary valve 41 without delay. The rotary valve 41 has the volume surrounded by the partition of the valve body,
Scrape away the waste plastic from. Therefore,
The waste plastic is conveyed to the first storage chamber 42 without being compressed.

Next, after stopping the bridge breaker 11a and the rotary valve 41, the first damper 42a is opened.
Therefore, the waste plastic in the first storage chamber 42 is
It falls into the storage chamber 43. Subsequently, after closing the first damper 42a, the second damper 43a is opened. Therefore, the waste plastic in the second storage chamber 43 is the first plastic of the dechlorination device 50.
It is put into the supply port 61a of the extruder 60. At this time, the inside of the first cylinder 61 of the first extruder 60 and the inside of the second accommodation chamber 43 communicate with each other, and the gas generated in the first extruder 60 flows into the second accommodation chamber 43.

Next, after closing the second damper 43a, the exhaust pump 45 is operated to exhaust the gas in the second storage chamber 43. Then, the gas supply device 47 is operated to supply the nitrogen gas into the second storage chamber 43 up to the atmospheric pressure. As a result, the gas in the second storage chamber 43 is replaced with nitrogen gas.

The waste plastic supplied into the first cylinder 61 is heated at 200 to 270 ° C. by the heater 64. Here, the principle of separating only DOP in PVC will be described. FIG. 5 shows a thermogravimetric-mass simultaneous analyzer (ThermoGravity-MassSpec).
3 is a graph showing the results of measuring the decomposition temperatures of PVC and DOP by an analyzer that is composed of a precision balance, a heating device, and a mass device, and that can accurately measure the decomposition temperature of substances. DOP is about 2 from this graph
It can be seen that decomposition started at 00 ° C and ended at about 270 ° C. On the other hand, PVC is about 280 ℃ ~ 300 ℃
It can be seen that decomposition occurs within the range.

Therefore, as described above, in the first extruder 60, only DOP is thermally decomposed to form vapor phase phthalic anhydride, which is exhausted from the exhaust port 61c. The exhausted gas-phase phthalic anhydride is transferred to the phthalic acid recovery unit 65,
Since the pipe 66 is kept warm, the pipe 66 does not crystallize in the pipe 66 and is not blocked. On the other hand, PV
C is not decomposed and is extruded from the outlet 61b to the second extruder 70.

The waste plastic supplied into the second cylinder 71 is heated at 280 to 300 ° C. by the heater 74. PVC is approximately 280-300 as described above.
Hydrochloric acid gas is generated at about ° C. In addition, since the temperature at which the oil component decomposes is 350 ° C. or higher, it is not thermally decomposed in the first extruder 60 and the second extruder 70.

Since the groove 72a of the second screw 72 is formed so as to reduce its volume toward the discharge port 71b as shown in FIG. 4B, the molten waste plastic in the groove 72a is compressed. It receives force and is stirred. Therefore, the amount of hydrochloric acid gas generated in the waste plastic increases. Then, it is extruded from the discharge port 71b into the melting tank 15. The dechlorination rate of the waste plastic at this time is as shown in Table 2.

[0071]

[Table 2]

Waste plastic dechlorinated is melted in tank 1.
It is melted at 5, and then sent to the decomposition tank 16. In the decomposition tank 16, the waste plastic is heated to, for example, about 450 ° C. to be thermally decomposed, and a decomposed gas and a residue from which oil is removed are generated. The heating is performed from the outside of the decomposition tank 16 with an electric heater or a heavy oil burner. The cracked gas generated in the cracking tank 16 is sent to the fractionation tower 17, where heavy oil, medium oil,
Fractionated to light oil. Finally, the residue remaining in the decomposition tank 16 is removed.

As described above, in the waste plastic oiling device 30 according to the first embodiment of the present invention, when the waste plastic is put into the dechlorination device 50, the waste plastic is not compacted, so that a bridge is generated. Since it does not occur, it can be easily added in a fixed amount. Moreover, since vibration was applied, the waste plastic could not be bridged, and the discharge was facilitated.

On the other hand, in the dechlorination apparatus 50, since the DOP and PVC are thermally decomposed by separate extruders by utilizing the difference in the temperature at which they are thermally decomposed, phthalic anhydride and hydrochloric acid are further separated. There is no need to separate according to the process. Further, since the phthalic anhydride in the vapor phase is transferred while being maintained at the temperature, the pipe is not blocked.

Further, since the waste plastic melted in the second extruder 70 is put into the groove portion for gradually reducing the volume and the compressive force is applied, the amount of hydrochloric acid gas generated is increased and the dechlorination rate is improved.

FIG. 6 is a sectional view showing a closing mechanism 80 according to a first modification of the present invention. The charging mechanism 80 is different from the above-described charging mechanism 40 in that a screw feeder 81 and a stirring blade 82 are used instead of the rotary valve 41. The screw feeder 81 and the stirring blade 82 are attached to the same rotating shaft 83, and are continuously driven to rotate by a drive motor 84 for continuously supplying the dechlorination device 50.

Even with such a charging mechanism 80, crushed waste plastic, which is likely to have a bridge, can be continuously charged into the dechlorination apparatus 50 without causing a bridge.

FIGS. 7A to 7C are side views showing second screws 91 to 93 according to second to fourth modifications of the present invention. The second screw 72 described above compresses the waste plastic by gradually decreasing the depth of the groove portion 72a, but as shown in FIG.
The screw 91 is formed such that the width of the groove portion 91a is gradually narrowed to reduce the volume of waste plastic.

As shown in FIG. 7B, the second screw 92 is formed so that the pitch of the groove portion is gradually narrowed to compress the waste plastic.

As shown in FIG. 7C, the second screw 93 is formed so that the outer diameter of its blade portion 93a becomes gradually smaller. In FIG. 7C, reference numeral 94 denotes a cylinder, and the cylinder 94 is also formed so that the inner diameter thereof becomes gradually smaller like the second screw 93, so that the waste plastic is compressed.

8 to 11 are views showing second screws 101 to 103 according to fifth to seventh modifications of the present invention.

As shown in FIGS. 8 (a) and 8 (b), a projection 101b is attached to the blade 101a of the second screw 101 along the outer periphery of the blade 101a by welding or bolting. It is preferable that about six protrusions 101b are attached per rotation. The protrusion 101b is formed in a substantially L-shaped cross section as shown in FIGS. 9 (a) to 9 (c). The shape of the protrusion 101b is determined by the amount and viscosity of the waste plastic to be heated. The axial length of the second screw 101 of the protrusion 101b is preferably formed to be 1/2 or more of the length of the groove 101c in order to ensure stirring efficiency. The second screw 101 is suitable when the amount of the waste plastic P is relatively small and has a low viscosity, and is collected on the bottom side. The two-dot chain line R1 in FIG. 8 (b) shows the movement of the waste plastic.

As shown in FIGS. 10A and 10B, the second
A protrusion 102b is attached to the blade 102a of the screw 102 by welding or bolting from the outer periphery of the blade 102a toward the rotating shaft side. The protrusion 10
It is preferable that about 4 to 6 2b are attached per rotation. The protrusion 102b is formed to have a substantially L-shaped cross section. The shape of the protrusion 102b is determined by the amount and viscosity of the waste plastic to be heated. Protrusion 10
The axial length of the second screw 102 of 2b is equal to the groove portion 1
It is desirable that it is formed to be 1/2 or more of the length of 02c. The second screw 102 is a waste plastic P
Is suitable for the case where the amount is relatively small and the viscosity is low and the amount is accumulated on the bottom side. The two-dot chain line R2 in FIG. 10B shows the movement of the waste plastic.

As shown in FIGS. 11A and 11B, the second
Four protrusions 103b are attached to the blade 103a of the screw 103 by welding or bolting from the outer periphery of the blade 103a in a row along the rotation axis side. In addition,
It is preferable that the protrusions 103b are attached in about 4 to 6 rows per rotation. The protruding portion 103b is formed in a substantially L-shaped cross section. The shape of the protrusion 103b is determined by the amount and viscosity of the waste plastic to be heated.
The length of the protrusion 103b in the axial direction of the second screw 103 is preferably 1/2 or more of the length of the groove 103c. The second screw 103 is suitable when the amount of waste plastic P is large and the viscosity is high and the waste plastic P is accumulated on the bottom side. In addition, FIG. 11B
The middle two-dot chain line R3 shows the movement of the waste plastic.

In the second screws 101 to 103 of these fifth to seventh modifications, the groove portions 101c, 102c, 10 are formed.
Since the waste plastic in 3c is agitated, the waste plastic can be heated uniformly and the amount of hydrochloric acid gas generated increases.

12 to 14 are views showing second screws 104 to 106 according to eighth to tenth modifications of the present invention.

As shown in FIGS. 12 (a) and 12 (b), the second
A protrusion 104b is attached to the blade 104a of the screw 104 along the outer circumference of the blade 104a by welding or bolting. It is preferable that about six protrusions 104b are attached per rotation. The length of the protrusion 104b in the axial direction of the second screw 104 is preferably the same as the length of the groove 104c in order to ensure stirring efficiency.

As shown in FIGS. 13 (a) and 13 (b), the second
A projection 105b is attached to the blade 105a of the screw 105 by welding or bolting from the outer periphery of the blade 105a toward the rotary shaft side. The protrusion 10
It is preferable that about 5 to 5 b are attached per rotation. The protrusion 105b is formed in a substantially L-shaped cross section. The shape of the protrusion 105b is determined by the amount and viscosity of the waste plastic to be heated. Protrusion 10
The axial length of the second screw 105 of 5b is the groove portion 1
It is desirable that the length is the same as that of 05c.
The second screw 105 is suitable when the amount of the waste plastic P is relatively small and has a low viscosity and is accumulated on the bottom side.

As shown in FIGS. 14A and 14B, the second
Four protrusions 106b are attached to the blade 106a of the screw 106 in a row from the outer circumference of the blade 106a along the rotation axis side by welding or bolting. In addition,
It is preferable that the protrusions 106b are attached in about 4 to 6 rows per rotation. The protrusion 106b is formed in a substantially L-shaped cross section. The shape of the protrusion 106b is determined by the amount and viscosity of the waste plastic to be heated.
The length of the protrusion 106b in the axial direction of the second screw 106 is preferably formed to be the same as the length of the groove 106c.

Also in the second screws 104 to 106 of these eighth to tenth modified examples, the same effects as those of the above fifth to seventh modified examples can be obtained.

FIG. 12 is a view showing a waste plastic oiling apparatus 110 according to the second embodiment of the present invention. In addition,
In this figure, the same functional parts as those in FIG. 1 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

The waste plastic oiling device 110 differs from the waste plastic oiling device 30 described above in that a dechlorination device 120 is provided in place of the dechlorination device 50.

The dechlorination apparatus 120 is equipped with an extruder 130. The extruder 130 includes a cylindrical cylinder 131, a screw 132 coaxially arranged with the cylinder 131, a motor 133 that rotationally drives the screw 132, and the periphery of the cylinder 131.
200 to 2 cylinders 131 are arranged in the middle left M
A heating heater 134 that heats at 70 ° C. and a heating heater 135 that heats the cylinder 131 at 280 to 300 ° C., which is arranged in the right portion N in FIG. 12, are provided.

In FIG. 1, 131a is a supply port arranged below the second storage chamber 43 of the charging mechanism 40, 131b is a discharge port for discharging molten plastic waste, and 131c is a separated vapor phase phthalic anhydride. Exhaust port for discharging air, 131
Reference numeral d denotes an exhaust port for discharging the separated hydrochloric acid gas.
Further, the exhaust port 131c is connected to a phthalic acid recovery device 136 for recovering phthalic anhydride via a pipe 137.
Further, a heater 138 for heating at 150 ° C. is provided around the pipe 137. Furthermore, exhaust port 1
31d is connected to a hydrochloric acid production tower 14 for recovering hydrochloric acid via a pipe 139.

As shown in FIG. 4B, the screw 131 is formed so that the depth of the groove becomes shallower toward the discharge port 161d, and the waste plastic pushed out by the screw 132 is reduced in volume. Compressive force is working. Further, since the pitch is formed to be large at the portion facing the exhaust port 131c, the liquid level of the waste plastic melted at that portion is lowered, and the vapor phase phthalic anhydride is easily discharged. .

In the dechlorination apparatus 120 incorporated in the waste plastic oiling apparatus 110 thus constructed, the waste plastic is dechlorinated as follows.

That is, the waste plastic supplied into the cylinder 61 is heated to 200 to 27 by the heater 67.
Heat at 0 ° C. As mentioned above, DOP begins to decompose at 200 ° C and ends at 270 ° C, and PVC decomposes at 280 ° C.
Decomposes in the range of ℃ to 300 ℃.

Therefore, as described above, the extruder 1
In the portion M on the left side of FIG. 12 in FIG. 30, only DOP is thermally decomposed to become vapor-phase phthalic anhydride and exhausted from the exhaust port 131c. The exhausted vapor phase phthalic anhydride is transferred to the phthalic acid recovery device 136, but since the pipe 137 is kept at a temperature higher than the crystallization temperature, the pipe 137 is not crystallized and the pipe 137 is blocked. There is no. On the other hand, PVC is not decomposed in the part M on the left side in FIG. The hydrochloric acid gas generated by the decomposition of PVC is supplied from the exhaust port 131d through the pipe 139 to the hydrochloric acid production tower 1.
Transferred to 4. The dechlorinated waste plastic is transferred from the discharge port 131b to the melting tank 15 via the pipe 140.

Since the groove portion of the screw 132 is formed so as to reduce its volume toward the discharge port 131b like the above-mentioned second screw 72, the molten waste plastic in the groove portion receives a compressive force, Be stirred. Therefore, the amount of hydrochloric acid gas generated in the waste plastic increases.

As described above, in the waste plastic oiling apparatus 110 according to the second embodiment of the present invention, the same effect as in the above-described first embodiment can be obtained, and the dechlorination apparatus 120 is a single unit. Since the dechlorination can be performed by the extruder 130, the device can be manufactured at low cost.

The present invention is not limited to the above embodiments. That is, in the above embodiment,
I explained the case of converting waste plastic into oil,
It may be applied to the case where the waste plastic after dechlorination is used as a solid fuel or the case where it is incinerated as it is. In addition, it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0102]

According to the invention described in claim 1, the waste plastic containing vinyl chloride is decomposed in the first heating section at the first temperature at which the phthalic acid plasticizer is decomposed and the vinyl chloride is not decomposed. Since heating is performed, phthalic anhydride is generated from the phthalic acid plasticizer in the first heating section, but hydrochloric acid gas is not generated from vinyl chloride. Also,
Since the second heating portion is heated at the second temperature at which vinyl chloride is decomposed and the waste plastic is not decomposed, hydrochloric acid gas is generated from the vinyl chloride, but the waste plastic is not decomposed. Therefore, phthalic anhydride, hydrochloric acid gas, and plastic decomposition gas can be recovered separately.

According to the invention described in claim 2, the first
The temperature is 200 to 270 ° C., and the second temperature is 280 to 3
Since the temperature is set to 00 ° C, the first temperature is 200 ° C to 2 ° C.
Since the temperature is 70 ° C. and the second temperature is 280 ° C. to 300 ° C., the phthalic acid plasticizer and vinyl chloride can be clearly separated.

According to the third aspect of the present invention, the waste plastic in the hopper can be put into the first storage chamber in a fixed amount by the rotary valve attached to the lower part of the hopper. In addition, a second storage chamber provided with a second damper is provided below the first storage chamber provided with the first damper, and a gas exchange unit for exchanging the gas in the second storage chamber with the dry gas is provided. Therefore, the waste plastic can be transferred from the first storage chamber to the dechlorination device without connecting the first storage chamber and the dechlorination device. For this reason,
By replacing the gas generated in the dechlorination device with the exchange gas in the second storage chamber, it is possible to prevent the gas from opening to the first storage chamber and the hopper side.

According to the invention described in claim 4, the dechlorinating part for decomposing chlorine by thermally decomposing the plastic group mixed with vinyl chloride and the oil decomposing from the plastic group passing through this dechlorinating part are pyrolyzed. In the plastic processing apparatus including an oil decomposing unit for taking out the oil, the dechlorination unit has a cylinder having a supply port to which the plastic is supplied at one end side and a discharge port for discharging the plastic at the other end side, and the cylinder. A screw which is arranged coaxially with the plastic in the cylinder and transfers the plastic toward the discharge port while gradually increasing the pressure, and heating for heating the plastic in the cylinder to a temperature at which chlorine is thermally decomposed. Since it is possible to stir the waste plastic by applying a compressive force, the waste plastic It is possible to uniformly heat, it is possible to increase the generation amount of hydrochloric acid gas.

According to the invention described in claim 5, since the screw is formed such that the depth of the groove portion becomes shallower toward the discharge port side of the cylinder, the waste plastic can be compressed.

According to the invention described in claim 6, since the screw is formed so that the width of the groove becomes narrower toward the discharge port side of the cylinder, the waste plastic can be compressed.

According to the invention described in claim 7, since the screw is formed so that the pitch of the groove portion becomes narrower toward the discharge port side of the cylinder, the waste plastic can be compressed.

According to the invention described in claim 8, the cylinder is formed so that the inner diameter thereof becomes smaller toward the discharge port side, and the screw is formed so that the outer diameter thereof becomes smaller toward the discharge port side. By doing so, the waste plastic can be compressed.

According to the invention described in claim 9, in the dechlorination section for thermally decomposing vinyl chloride in the plastic to separate chlorine, one end side of the dechlorination section is provided with the waste plastic and the other end. A cylinder having a discharge port for discharging the waste plastic on the side and a cylinder arranged coaxially with the cylinder and having an outer diameter formed along the inner wall of the cylinder to discharge the waste plastic supplied to the supply port of the cylinder. Equipped with a screw that transfers the waste plastic toward the outlet and a heating part that heats the waste plastic in the cylinder and thermally decomposes the vinyl chloride in the waste plastic, and the screw should have a protrusion that stirs the waste plastic. As a result, the agitation of the waste plastic is promoted, and the waste plastic can be heated uniformly. It is possible to increase the generation amount of hydrochloric acid gas.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a waste plastic oiling apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a hopper and a charging mechanism incorporated in the waste plastic oiling apparatus apparatus.

FIG. 3 is a timing chart showing the operation of the closing mechanism.

FIG. 4 is a side view showing a screw incorporated in a dechlorination device of the waste plastic oil conversion device.

FIG. 5 is a graph showing decomposition temperatures measured by a thermogravimetric-mass simultaneous analyzer for DOP and PVC.

FIG. 6 is a cross-sectional view showing a hopper and a feeding mechanism according to a first modified example of the present invention.

FIG. 7 is a sectional view showing a screw and a cylinder according to second to fourth modifications of the present invention.

8A and 8B are views showing a screw according to a fifth modified example of the present invention, in which FIG. 8A is a side view of a main part, and FIG. 8B is a sectional view taken along line AA in FIG. Sectional view seen.

FIG. 9 is a view showing a protrusion attached to the screw, (a) is an upper side view, (b) is a front side view,
(C) is sectional drawing which cut | disconnected by the BB line | wire in (b), and was seen in the arrow direction.

10A and 10B are views showing a screw according to a sixth modified example of the present invention, in which FIG. 10A is a side view of a main part, and FIG. 10B is a sectional view taken along line C-C in FIG. Sectional view seen.

11A and 11B are views showing a screw according to a seventh modified example of the present invention, in which FIG. 11A is a side view of a main part, and FIG. 11B is a sectional view taken along line D-D in FIG. Sectional view seen.

12A and 12B are views showing a screw according to an eighth modification of the present invention, in which FIG. 12A is a side view of a main part, and FIG. 12B is a sectional view taken along line EE in FIG. Sectional view seen.

13A and 13B are views showing a screw according to a ninth modified example of the present invention, in which FIG. 13A is a side view of a main part, and FIG. 13B is a sectional view taken along line FF in FIG. Sectional view seen.

FIG. 14 is a diagram showing a screw according to a tenth modified example of the present invention, in which (a) is a side view of a main part and (b) is (a).
Sectional drawing cut | disconnected by the GG line in FIG.

FIG. 15 is a configuration diagram showing an outline of a waste plastic oiling device according to a second embodiment of the present invention.

FIG. 16 is a configuration diagram showing an outline of a conventional waste plastic oiling device.

FIG. 17 is a view showing an example of a charging mechanism incorporated in the waste plastic oiling device.

[Explanation of symbols]

11 ... Hopper 14 ... Hydrochloric acid generation tower 15 ... Decomposition tank 40, 80 ... Input mechanism 42 ... 1st storage chamber 42a ... 1st damper 43 ... 2nd storage chamber 43a ... 2nd damper 50, 120 ... Dechlorination apparatus 60 ... 1 Extruder 61 ... 1st cylinder 62 ... 1st screw 70 ... 2nd extruder 71 ... 2nd cylinder 72 ... 2nd screw 64,74,67,134,135,138 ... Heater 65,136 ... Phthalic acid recovery Department

Claims (10)

[Claims] 1. A plastic processing apparatus having a function of thermally decomposing a plastic such as vinyl chloride to thermally decompose chlorine and a plasticizer from the vinyl chloride, and heating at a first temperature at which the plasticizer is thermally decomposed from the plastic. A first heating unit and a second heating unit that heats at a second temperature at which the chlorine is pyrolyzed from the plastic heated by the first heating unit are provided, and the first heating unit sets the temperature to the first temperature. It is characterized by comprising: a container that holds the temperature of 1 and encloses the plastic; a discharge pipe that discharges gas generated in the container; and a heating unit that maintains the temperature of the discharge pipe at a phthalic acid crystallization temperature or higher. And plastic processing equipment. 2. The first temperature is 200 to 270 ° C.,
The plastic processing apparatus according to claim 1, wherein the second temperature is 280 to 300 ° C. 3. A plastic processing apparatus comprising a dechlorination unit for thermally decomposing plastic to separate chlorine, and a charging mechanism for charging the plastic to the dechlorination unit, wherein the charging mechanism is the plastic. And a supply means for storing and supplying the plastic, a first door for opening and closing, and a first storage chamber for storing the plastic supplied from the supply means, and a first cover for the first storage chamber. Provided above the first
A second storage chamber provided with a second door that opens and closes when the door is opened and the plastic is supplied from the first storage chamber; and a gas for ventilating the gas in the second storage chamber with a dry gas. A plastic processing apparatus comprising: a replacement means. 4. A plastic treatment comprising a dechlorination unit for thermally decomposing chlorine by decomposing a plastic group mixed with vinyl chloride, and an oil decomposing unit for thermally decomposing and extracting an oil component from the plastic group passing through the dechlorination unit. In the apparatus, the dechlorination section has a cylinder having a supply port for supplying the plastic at one end side and a discharge port for discharging the plastic at the other end side, and is arranged coaxially with the cylinder, A screw for transferring the plastic toward the discharge port while gradually increasing the pressure, and a heating unit for heating the plastic in the cylinder to a temperature at which chlorine is thermally decomposed. Plastic processing equipment. 5. The plastic oiling apparatus according to claim 4, wherein the screw is formed so that the depth of the groove portion thereof gradually becomes shallower toward the discharge port side of the cylinder. 6. The plastic oiling apparatus according to claim 4, wherein the screw is formed so that the width of the groove portion thereof becomes gradually narrower toward the discharge port side of the cylinder. 7. The plastic oiling apparatus according to claim 4, wherein the screw is formed so that the pitch of its groove portion becomes gradually narrower toward the discharge port side of the cylinder. 8. The cylinder is formed so that its inner diameter is gradually reduced toward the discharge port side, and the screw is formed so that its outer diameter is gradually reduced toward the discharge port side. The plastic oiling apparatus according to claim 4, wherein 9. A plastic oiling device for melting, decomposing and oilizing a plastic containing vinyl chloride, comprising: a dechlorination unit for thermally decomposing the vinyl chloride in the plastic to separate chlorine; A plastic decomposition part for thermally decomposing the plastic from which the chlorine has been separated, and the dechlorination part has a supply port to which the plastic is supplied at one end and a discharge port for discharging the plastic to the other end. A cylinder having the same, the outer diameter of which is formed along the inner wall of the cylinder, and the plastic supplied to the supply port is directed toward the discharge port of the cylinder. The screw to be transferred and the plastic in the cylinder are heated to heat the vinyl chloride in the plastic. And a heating section for, plastic Yuka device, characterized in that the said screw has projections for stirring the plastic is provided. 10. A supply device for supplying a plastic, a dechlorination unit for recovering chlorine from the plastic supplied from the supply device, and a thermal decomposition for thermally decomposing the dechlorinated plastic to recover an oil component. In a plastic oil treatment apparatus including a tank, the dechlorination section is a first heating section that is heated at a first temperature at which the plasticizer is thermally decomposed from the plastic, and the first heating section that is heated by the first heating section. And a second heating unit that heats the plastic at a second temperature at which the chlorine is thermally decomposed.