JP2010126548A - Apparatus for decomposing plastic and method for decomposing plastic using the same - Google Patents

Apparatus for decomposing plastic and method for decomposing plastic using the same Download PDF

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JP2010126548A
JP2010126548A JP2008299458A JP2008299458A JP2010126548A JP 2010126548 A JP2010126548 A JP 2010126548A JP 2008299458 A JP2008299458 A JP 2008299458A JP 2008299458 A JP2008299458 A JP 2008299458A JP 2010126548 A JP2010126548 A JP 2010126548A
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decomposition
tank
plastic
steam
molded product
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Hiroshi Yano
宏 矢野
Shin Matsugi
伸 真継
Toshihiro Miyazaki
敏博 宮崎
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for decomposing a plastic, which inexpensively and simply achieves a washing treatment of a plastic molded article and a method for decomposing a plastic using the same. <P>SOLUTION: In the apparatus for decomposing a plastic, which is equipped with a decomposition tank 1 for decomposing a plastic with a solvent in a supercritical or subcritical state, a vapor discharge part 2 for discharging a vapor 50 in the decomposition tank 1 and a decomposed liquid discharge part 3 for discharging a decomposed liquid 60 in the decomposition tank 1, at least one of the discharged parts of the vapor discharge part 2 and the decomposed liquid discharge part 3 is equipped with cleaning apparatuses 23 and 33 for cleaning a plastic with the vapor 50 or the decomposed liquid 60 from the decomposition tank 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、プラスチックの分解装置とそれを用いたプラスチックの分解処理方法に関するものである。   The present invention relates to a plastic decomposing apparatus and a plastic decomposing method using the same.

ＦＲＰ（繊維強化プラスチック）に代表される強化プラスチックには一般に、炭酸カルシウム、水酸化アルミニウム等の無機粉体やガラス繊維等の無機充填材が含有されており、従来、このようなＦＲＰ等を材料とするプラスチック成形品の廃棄物を高温高圧で分解し、分解液から無機有価物や有機有価物を回収し、回収物を再利用することが検討されている。例えば、プラスチックを超臨界または亜臨界の状態で溶媒と接触させ、反応させることで無機有価物や有機有価物を分離回収する技術が提案されている（特許文献１参照）。この技術は、難水溶性の塩基の存在下に亜臨界水または超臨界水でプラスチックをモノマーやオリゴマーに分解してこれを無機有価物や有機有価物として分離回収するものである。
国際公開第２００４／０４１９１７号パンフレット Reinforced plastics represented by FRP (fiber reinforced plastics) generally contain inorganic powders such as calcium carbonate and aluminum hydroxide, and inorganic fillers such as glass fibers. It has been studied to decompose the plastic molding waste to be decomposed at high temperature and high pressure, collect inorganic valuables and organic valuables from the decomposed liquid, and reuse the recovered products. For example, a technique for separating and recovering inorganic valuables and organic valuables by bringing plastics into contact with a solvent in a supercritical or subcritical state and reacting them has been proposed (see Patent Document 1). In this technique, a plastic is decomposed into monomers and oligomers with subcritical water or supercritical water in the presence of a poorly water-soluble base, and this is separated and recovered as an inorganic valuable or organic valuable.
International Publication No. 2004/041917 Pamphlet

被分解物としてのプラスチック成形品は廃棄物であり、その使用形態によってはプラスチック成形品の表面に各種の物質が汚れとして付着している。この状態のまま分解処理を施すと分解反応の処理効率を低下させる一因となるため、分解処理に供される前に予めプラスチック成形品を洗浄しておくことが考えられる。しかしながら、このような洗浄処理を施すためには専用の設備を要し、設備の複雑化を招き、高コストになってしまう等の問題があった。   A plastic molded product as a material to be decomposed is waste, and various substances adhere to the surface of the plastic molded product as dirt depending on the form of use. If the decomposition treatment is performed in this state, it causes a reduction in the treatment efficiency of the decomposition reaction. Therefore, it is conceivable that the plastic molded product is washed in advance before being subjected to the decomposition treatment. However, in order to perform such a cleaning process, a dedicated facility is required, which causes problems such as an increase in complexity of the facility and a high cost.

本発明は、以上の通りの事情に鑑みてなされたものであり、プラスチック成形品の洗浄処理を安価にかつ簡便に実現できるプラスチックの分解装置とそれを用いたプラスチックの分解処理方法をを提供することを課題としている。   The present invention has been made in view of the circumstances as described above, and provides a plastic decomposing apparatus and a plastic decomposing method using the plastic decomposing apparatus that can easily and inexpensively implement a cleaning process for a plastic molded product. It is an issue.

本発明は以下のことを特徴としている。   The present invention is characterized by the following.

第１には、プラスチックを超臨界または亜臨界の状態で溶媒にて分解する分解槽と、分解槽内の蒸気を排出する蒸気排出部と、分解槽内の分解液を排出する分解液排出部を備えたプラスチックの分解装置において、蒸気排出部および分解液排出部のうち少なくともいずれか一方の排出部に分解槽内からの蒸気または分解液でプラスチックを洗浄する洗浄装置が設けられている。   1stly, the decomposition tank which decomposes | disassembles a plastic with a solvent in a supercritical or subcritical state, the steam discharge part which discharges | emits the vapor | steam in a decomposition tank, and the decomposition liquid discharge part which discharges | disassembles the decomposition liquid in a decomposition tank In the plastic decomposing apparatus, the cleaning apparatus for cleaning the plastic with the steam or the decomposing liquid from the decomposition tank is provided in at least one of the vapor discharging section and the decomposing liquid discharging section.

第２には、上記第１の発明において、蒸気排出部および分解液排出部は各々、分解槽に接続される排出管で形成され、前記排出管の途中に洗浄装置が設けられ、前記洗浄装置は、分解槽からの蒸気または分解液の導入口、および排出口を有する、プラスチックを収納する洗浄槽を備えている。   Secondly, in the first invention, each of the steam discharge part and the decomposition liquid discharge part is formed by a discharge pipe connected to a decomposition tank, and a cleaning device is provided in the middle of the discharge pipe. Is provided with a washing tank for storing plastic, which has an inlet for steam or decomposition liquid from the decomposition tank and an outlet.

第３には、プラスチックと溶媒を分解槽に投入して超臨界または亜臨界の状態でプラスチックを分解し、プラスチック分解後は、分解槽から高温高圧の蒸気を排出して分解槽を冷却しまたは分解槽から高温高圧の分解液を排出してこれを回収するプラスチックの分解処理方法において、分解槽から排出する高温高圧の蒸気および分解液のうち少なくともいずれか一方の媒体にプラスチックを接触させて洗浄し、洗浄したプラスチックを被分解物として前記分解槽に投入して分解する。   Third, the plastic and solvent are put into a decomposition tank to decompose the plastic in a supercritical or subcritical state. After the plastic decomposition, high-temperature and high-pressure steam is discharged from the decomposition tank to cool the decomposition tank or In the plastic decomposition method, which discharges the high-temperature and high-pressure decomposition liquid from the decomposition tank and collects it, the plastic is brought into contact with at least one of the high-temperature and high-pressure steam discharged from the decomposition tank and the decomposition liquid and washed. Then, the washed plastic is put into the decomposition tank as an object to be decomposed and decomposed.

第１または第２の発明によれば、既存の設備を利用してプラスチック分解処理後の蒸気や分解液を用いて被分解物であるプラスチック成形品を安価に洗浄することができる。また、蒸気や分解液は高温高圧状態であるため、プラスチック成形品の表面に付着した汚れ等を容易にしかも確実に洗浄除去することができる。   According to the 1st or 2nd invention, the plastic molded product which is a to-be-decomposed thing can be wash | cleaned at low cost using the vapor | steam and decomposition solution after a plastic decomposition process using the existing installation. Further, since the vapor and the decomposition liquid are in a high temperature and high pressure state, dirt and the like adhering to the surface of the plastic molded product can be easily and reliably removed by washing.

第３の発明によれば、プラスチック分解処理後の高温高圧の蒸気や分解液を用いることによりプラスチック成形品の表面に付着した汚れ等を安価にかつ簡便に除去することができる。   According to the third invention, dirt and the like adhering to the surface of the plastic molded article can be easily and inexpensively removed by using high-temperature and high-pressure steam or decomposition liquid after the plastic decomposition treatment.

図１は、本発明に係るプラスチックの分解装置の一実施形態を示した概要構成図であり、図２（ａ）はプラスチックの分解装置の蒸気排出部に設けられる洗浄装置の一実施形態を示した概要構成図であり、図２（ｂ）はプラスチックの分解装置の分解液排出部に設けられる洗浄装置の一実施形態を示した概要構成図である。   FIG. 1 is a schematic configuration diagram showing an embodiment of a plastic decomposing apparatus according to the present invention, and FIG. 2 (a) shows an embodiment of a cleaning apparatus provided in a vapor discharge portion of the plastic decomposing apparatus. FIG. 2B is a schematic configuration diagram showing an embodiment of a cleaning device provided in the decomposition liquid discharge portion of the plastic decomposition device.

この実施形態のプラスチックの分解装置は、耐圧性を有する円筒形の分解槽１を備えており、この分解槽１内で超臨界状態または亜臨界状態の流体にてプラスチック成形品の分解を行っている。   The plastic decomposing apparatus according to this embodiment includes a cylindrical decomposition tank 1 having pressure resistance, and the plastic molded product is decomposed in a supercritical or subcritical fluid in the decomposition tank 1. Yes.

分解槽１の外周にはヒーターや熱媒ジャケット等で形成される加熱手段８が設けられており、温度センサー等で形成される温度検出器９が分解槽１内に差し込んで設けられている。また、分解槽１には内部の圧力を測定する圧力ゲージなどで形成される圧力検出手段１０が設けられている。この温度検出器９および圧力検出手段１０で分解槽１の温度、圧力をそれぞれ検出しながら、加熱手段８で分解槽１内を加熱することによって、検出される温度と圧力に基づいて加熱手段８を制御して最適温度での加熱を行うようにしている。   A heating means 8 formed by a heater, a heat medium jacket or the like is provided on the outer periphery of the decomposition tank 1, and a temperature detector 9 formed by a temperature sensor or the like is provided by being inserted into the decomposition tank 1. The decomposition tank 1 is provided with a pressure detecting means 10 formed by a pressure gauge for measuring the internal pressure. While detecting the temperature and pressure of the decomposition tank 1 with the temperature detector 9 and the pressure detection means 10, the heating means 8 is heated based on the detected temperature and pressure by heating the inside of the decomposition tank 1 with the heating means 8. Is controlled to perform heating at the optimum temperature.

分解槽１には、分解槽１内に投入されるプラスチック成形品と流体とを混合する攪拌装置１１が設けられている。攪拌装置１１は、回転軸１１１と、回転軸１１１に取り付けられた攪拌翼１１２を有しており、分解槽１の上部に設けたモータ１１３で回転軸１１１を回転駆動することにより、分解槽１内のプラスチック成形品と流体を攪拌混合する。本実施形態において用いられるプラスチック成形品は、特に制限されるものではないが、不飽和ポリエステル樹脂等の熱硬化性樹脂成形品の廃棄物である。プラスチック成形品は分解反応がし易くなるように粉粒状に粉砕されて水等の流体と共に分解槽１に投入されるが、プラスチック成形品は通常疎水性であるため、水等の流体と馴染みにくくしかも粉砕したプラスチック成形品の粉粒体は空気を噛んでいるために液面に浮き易い。このようにプラスチック成形品と流体との混合が不十分であると、プラスチック成形品の分解の効率が悪くなる。このために本実施形態では、プラスチック成形品と流体との混合を十分なものとするために、攪拌装置１２１を備えた前処理槽１２を設けている。この前処理槽１２は、原料供給配管１３を介して分解槽１に接続されている。プラスチック成形品の粉粒体と水等の流体とを前処理槽１２に投入し、攪拌装置１２１で十分に攪拌して流体中にプラスチック成形品を混合して、流体中にプラスチック成形品が馴染んだスラリ状にした後、液送ポンプ１４で原料供給配管１３を通してプラスチック成形品と流体のスラリを分解槽１に供給するようにしている。これによって、プラスチック成形品の分解が効率良くおこなわれるようにしている。   The decomposition tank 1 is provided with a stirrer 11 for mixing the plastic molded product and the fluid to be introduced into the decomposition tank 1. The stirring device 11 has a rotating shaft 111 and a stirring blade 112 attached to the rotating shaft 111, and the rotating shaft 111 is rotationally driven by a motor 113 provided on the upper portion of the disassembling tank 1. Stir and mix the plastic molding and fluid inside. The plastic molded product used in the present embodiment is not particularly limited, but is a waste of a thermosetting resin molded product such as an unsaturated polyester resin. The plastic molded product is pulverized in a granular form so as to facilitate the decomposition reaction and is put into the decomposition tank 1 together with a fluid such as water. However, since the plastic molded product is usually hydrophobic, it is difficult to be familiar with a fluid such as water. In addition, the pulverized plastic molded product powder is easy to float on the liquid surface because it is in the air. Thus, when mixing of a plastic molded product and a fluid is insufficient, the efficiency of decomposition | disassembly of a plastic molded product will worsen. For this reason, in this embodiment, in order to sufficiently mix the plastic molded product and the fluid, the pretreatment tank 12 including the stirring device 121 is provided. The pretreatment tank 12 is connected to the decomposition tank 1 through a raw material supply pipe 13. A powder of plastic molded product and a fluid such as water are put into the pretreatment tank 12, and sufficiently stirred by the agitator 121 to mix the plastic molded product into the fluid, so that the plastic molded product becomes familiar with the fluid. After forming the slurry, the liquid feed pump 14 supplies the plastic molded product and fluid slurry to the decomposition tank 1 through the raw material supply pipe 13. As a result, the plastic molded product is efficiently decomposed.

分解槽１の上部には、分解槽１内の分解液６０の高温高圧の蒸気５０を排出するための蒸気排出用配管２１が接続され、蒸気排出部２を形成している。蒸気排出用配管２１の途中には開度の調整が可能な減圧弁２２が設けられており、プラスチック成形品の分解が終了した後、減圧弁２２を開放することにより、高温高圧の蒸気５０が蒸気排出用配管２１を通じて分解槽１の外部に放出され、分解槽１内の圧力が減圧する。このように分解槽１内の圧力が減圧すると分解槽１内の分解液６０が気化し、その際の気化熱によって分解液６０の温度が下がり、分解液６０が冷却される（フラッシュ冷却）。蒸気排出用配管２１に放出された蒸気５０は、分解槽１とは反対側の蒸気排出用配管２１の一端に接続される、冷却水等の冷媒が循環している凝縮器４に送られて熱交換され、さらに凝縮水として回収槽５に移送されて回収されるようになっている。   A steam discharge pipe 21 for discharging the high-temperature and high-pressure steam 50 of the decomposition solution 60 in the decomposition tank 1 is connected to the upper part of the decomposition tank 1 to form a steam discharge part 2. A decompression valve 22 whose opening degree can be adjusted is provided in the middle of the steam discharge pipe 21. After the decomposition of the plastic molded product is finished, the decompression valve 22 is opened, so that the high-temperature and high-pressure steam 50 is generated. It is discharged to the outside of the decomposition tank 1 through the steam discharge pipe 21 and the pressure in the decomposition tank 1 is reduced. When the pressure in the decomposition tank 1 is thus reduced, the decomposition liquid 60 in the decomposition tank 1 is vaporized, and the temperature of the decomposition liquid 60 is lowered by the heat of vaporization at that time, and the decomposition liquid 60 is cooled (flash cooling). The steam 50 discharged to the steam discharge pipe 21 is sent to the condenser 4 connected to one end of the steam discharge pipe 21 on the side opposite to the decomposition tank 1 and circulating a refrigerant such as cooling water. Heat exchange is performed, and the condensed water is transferred to the recovery tank 5 and recovered.

本実施形態では、減圧弁２２の下流側の蒸気排出用配管２１に洗浄装置２３が設けられている。この洗浄装置２３は、図２（ａ）に示すように、上部に蒸気導入口２５を備え底部に蒸気排出口２６を備えた円筒形の耐圧容器からなる洗浄槽２４で構成されており、分解槽１からの高温高圧の蒸気５０が上部の蒸気導入口２５を介して洗浄槽２４内に導入され、洗浄槽２４内に導入された蒸気５０が底部の蒸気排出口２６を介して排出されるように蒸気排出用配管２１に接続されている。洗浄槽２４内には試料設置板２７が配設されており、分解処理が施されていないプラスチック成形品が前記試料設置板２７上に載置されて洗浄槽２４内に収納される。減圧弁２２を開放すると、分解槽１からの高温高圧の蒸気５０が洗浄槽２４の上方から下方に向かって洗浄槽２４内を通過する。その際、洗浄槽２４内に収納されたプラスチック成形品がこの高温高圧の蒸気５０に接触することによりプラスチック成形品の表面に付着した汚れ等が除去される。汚れ等が除去されたプラスチック成形品は、被分解物として分解槽１に投入されるか、あるいは前処理槽１２を設けている場合には前処理槽１２に投入される。高温高圧の蒸気５０と洗浄槽２４内に収納されたプラスチック成形品との接触効率を高めるために、例えば、回転軸２８１と回転軸２８１に取り付けられた攪拌翼２８２を有する攪拌装置２８を設け、洗浄槽２４に蒸気５０を通過させている期間中、前記攪拌装置２８で試料設置板２７上のプラスチック成形品を攪拌するようにしてもよい。また、プラスチック成形品を、粒径２〜２０ｍｍ程度、好ましくは最大粒子径が５ｍｍ以下の粉粒体に予め粉砕しておくことも効果的である。このようにプラスチック成形品を粉砕しておくことは、分解槽１に投入されたプラスチック成形品の粉粒体が分解槽１下部に沈降して分解反応が受け難くなることを防止したり、また加熱時にプラスチック成形品の粉粒体が分解槽１内面に固着したりすることを防止する等、流体におけるプラスチック成形品の粉粒体の攪拌混合性を高めて流体との反応効率を向上させる観点からも好ましい。なお、試料設置板２７は、蒸気５０を通過させるために、網状体のものまたは上下方向に貫通する孔を多数設けた板状体のものが用いられる。その孔の大きさはプラスチック成形品の粉粒体の粒径よりも小さいことが考慮される。   In the present embodiment, a cleaning device 23 is provided in the steam discharge pipe 21 on the downstream side of the pressure reducing valve 22. As shown in FIG. 2 (a), the cleaning device 23 includes a cleaning tank 24 composed of a cylindrical pressure vessel having a steam inlet 25 at the top and a steam outlet 26 at the bottom. The high-temperature and high-pressure steam 50 from the tank 1 is introduced into the cleaning tank 24 through the upper steam inlet 25, and the steam 50 introduced into the cleaning tank 24 is discharged through the bottom steam outlet 26. In this way, it is connected to the steam discharge pipe 21. A sample setting plate 27 is disposed in the cleaning tank 24, and a plastic molded product that has not been subjected to a decomposition process is placed on the sample setting plate 27 and stored in the cleaning tank 24. When the pressure reducing valve 22 is opened, the high-temperature and high-pressure steam 50 from the decomposition tank 1 passes through the cleaning tank 24 from the upper side to the lower side of the cleaning tank 24. At that time, the plastic molded product housed in the cleaning tank 24 comes into contact with the high-temperature and high-pressure steam 50, thereby removing dirt and the like attached to the surface of the plastic molded product. The plastic molded product from which dirt and the like have been removed is put into the decomposition tank 1 as an object to be decomposed, or into the pretreatment tank 12 when the pretreatment tank 12 is provided. In order to increase the contact efficiency between the high-temperature and high-pressure steam 50 and the plastic molded product stored in the cleaning tank 24, for example, a stirring device 28 having a rotating shaft 281 and a stirring blade 282 attached to the rotating shaft 281 is provided. During the period when the vapor 50 is passed through the cleaning tank 24, the plastic molded product on the sample setting plate 27 may be stirred by the stirring device 28. It is also effective to previously pulverize the plastic molded product into a granular material having a particle size of about 2 to 20 mm, preferably a maximum particle size of 5 mm or less. By crushing the plastic molded article in this manner, it is possible to prevent the powder particles of the plastic molded article charged in the decomposition tank 1 from sinking to the lower part of the decomposition tank 1 and making the decomposition reaction difficult. The viewpoint of improving the reaction efficiency with the fluid by increasing the stirring and mixing of the powder of the plastic molded product in the fluid, such as preventing the powder of the plastic molded product from adhering to the inner surface of the decomposition tank 1 during heating. Is also preferable. The sample placement plate 27 is a net-like body or a plate-like body provided with a number of holes penetrating in the vertical direction in order to allow the vapor 50 to pass therethrough. It is considered that the size of the hole is smaller than the particle size of the granular material of the plastic molded product.

回収槽５で回収した凝縮水には、洗浄装置２３の洗浄処理によってプラスチック成形品から除去された汚れを含んでいるため廃棄してもよいし、別途汚れを取り除く処理を行った後、プラスチック成形品の分解処理に用いる流体として後工程で活用してもよい。   The condensed water collected in the collection tank 5 contains dirt removed from the plastic molded product by the washing process of the washing device 23, and therefore may be discarded. You may utilize in a post process as a fluid used for the decomposition | disassembly process of goods.

分解槽１の底部には、分解槽１内の高温高圧の分解液６０を排出するための分解液排出用配管３１が接続され、分解液排出部３を形成している。分解液排出用配管３１の途中には開度の調整が可能な開閉弁３２が設けられており、プラスチック成形品の分解が終了した後、開閉弁３２を開放することにより、高温高圧の分解液６０が分解液排出用配管３１を通じて分解槽１の外部に排出される。分解液排出用配管３１に排出された分解液６０は、分解槽１とは反対側の分解液排出用配管３１の一端に接続される、分解液回収槽６に移送されて回収されるようになっている。   A decomposition liquid discharge pipe 31 for discharging the high-temperature and high-pressure decomposition liquid 60 in the decomposition tank 1 is connected to the bottom of the decomposition tank 1 to form a decomposition liquid discharge portion 3. An opening / closing valve 32 whose opening degree can be adjusted is provided in the middle of the decomposition liquid discharge pipe 31. After the decomposition of the plastic molded product is finished, the opening / closing valve 32 is opened, so that a high temperature / high pressure decomposition liquid is obtained. 60 is discharged to the outside of the decomposition tank 1 through the decomposition liquid discharge pipe 31. The decomposition liquid 60 discharged to the decomposition liquid discharge pipe 31 is transferred to the decomposition liquid recovery tank 6 connected to one end of the decomposition liquid discharge pipe 31 opposite to the decomposition tank 1 so as to be recovered. It has become.

本実施形態では、開閉弁３２の下流側の分解液排出用配管３１に洗浄装置３３が設けられている。この洗浄装置３３は、蒸気排出用配管２１に設けられる洗浄装置２３と同様の構成のものが考慮される。すなわち、分解液排出用配管３１に設けられる洗浄装置３３は、図２（ｂ）に示すように、上部に分解液導入口３５を備え底部に分解液排出口３６を備えた円筒形の耐圧容器からなる洗浄槽３４で構成されており、分解槽１からの高温高圧の分解液６０が上部の分解液導入口３５を介して洗浄槽３４内に導入され、洗浄槽３４内に導入された分解液６０が底部の分解液排出口３６を介して排出されるように分解液排出用配管３１に接続されている。洗浄槽３４内には試料設置板３７が配設されており、分解処理が施されていないプラスチック成形品が前記試料設置板３７上に載置されて洗浄槽３４内に収納される。分解槽１内から分解液６０を排出するに際して、分解槽１内が１００℃以上の高温状態であれば槽内圧が大気圧以上であるため、槽内の系を外部の系に開放することにより特別な排出手段を設けることなく分解槽１から分解液６０を排出させることが可能である。分解液６０は亜臨界または超臨界の状態で溶解しない無機充填材を含有するスラリ状となっており、開閉弁３２を開放すると、分解槽１からの高温高圧のスラリ状の分解液６０が洗浄槽３４の上方から下方に向かって洗浄槽３４内を通過する。その際、洗浄槽３４内に収納されたプラスチック成形品がこの高温高圧の分解液６０に接触することにより、分解液６０がもつ運動エネルギおよび熱エネルギによりプラスチック成形品の表面に付着した汚れ等が除去される。汚れ等が除去されたプラスチック成形品は、被分解物として分解槽１に投入されるか、あるいは前処理槽１２を設けている場合には前処理槽１２に投入される。   In the present embodiment, a cleaning device 33 is provided in the decomposition liquid discharge pipe 31 on the downstream side of the on-off valve 32. This cleaning device 33 is considered to have the same configuration as the cleaning device 23 provided in the steam discharge pipe 21. That is, as shown in FIG. 2 (b), the cleaning device 33 provided in the decomposition liquid discharge pipe 31 is a cylindrical pressure vessel having a decomposition liquid inlet 35 at the top and a decomposition liquid outlet 36 at the bottom. The high-temperature and high-pressure decomposition liquid 60 from the decomposition tank 1 is introduced into the cleaning tank 34 through the upper decomposition liquid inlet 35, and the decomposition introduced into the cleaning tank 34. The liquid 60 is connected to the decomposition liquid discharge pipe 31 so as to be discharged through the decomposition liquid discharge port 36 at the bottom. A sample setting plate 37 is disposed in the cleaning tank 34, and a plastic molded product that has not been subjected to decomposition treatment is placed on the sample setting plate 37 and stored in the cleaning tank 34. When the decomposition solution 60 is discharged from the decomposition tank 1, if the decomposition tank 1 is in a high temperature state of 100 ° C. or higher, the internal pressure of the tank is equal to or higher than the atmospheric pressure. Therefore, by opening the system in the tank to an external system It is possible to discharge the decomposition solution 60 from the decomposition tank 1 without providing any special discharge means. The cracked liquid 60 is in the form of a slurry containing an inorganic filler that does not dissolve in a subcritical or supercritical state. It passes through the cleaning tank 34 from above the tank 34 downward. At that time, the plastic molded product stored in the cleaning tank 34 comes into contact with the high-temperature and high-pressure decomposition solution 60, so that dirt or the like attached to the surface of the plastic molded product due to the kinetic energy and thermal energy of the decomposition solution 60. Removed. The plastic molded product from which dirt and the like have been removed is put into the decomposition tank 1 as an object to be decomposed, or into the pretreatment tank 12 when the pretreatment tank 12 is provided.

この洗浄装置３３に設けられる試料設置板３７とそこに載置されるプラスチック成形品は、上記した蒸気排出用配管２１における洗浄装置２３の試料設置板２７とプラスチック成形品と同様であるため説明を省略する。また高温高圧の分解液６０と洗浄槽３４内に収納されたプラスチック成形品との接触効率を高めるために、この洗浄装置３３においても攪拌装置３８を設けてもよい。攪拌装置３８は、上記した蒸気排出用配管２１における洗浄装置２３に設けられる攪拌装置２８と同様の構成のものが考慮される。   The sample mounting plate 37 provided in the cleaning device 33 and the plastic molded product placed thereon are the same as the sample mounting plate 27 and the plastic molded product of the cleaning device 23 in the steam discharge pipe 21 described above, so that the description will be given. Omitted. In order to improve the contact efficiency between the high-temperature and high-pressure decomposition solution 60 and the plastic molded product stored in the cleaning tank 34, the cleaning device 33 may also be provided with a stirring device 38. As the stirring device 38, the same configuration as the stirring device 28 provided in the cleaning device 23 in the steam discharge pipe 21 is considered.

分解液回収槽６で回収した分解液６０には、洗浄装置３３の洗浄処理によってプラスチック成形品から除去された汚れを含んでいるため廃棄してもよいし、別途汚れを取り除く処理を行った後、後工程で活用してもよい。   The decomposition solution 60 collected in the decomposition solution collection tank 6 contains dirt removed from the plastic molded product by the washing process of the washing device 33, and therefore may be discarded, or after performing a separate removal process. It may be used in a later process.

以上の構成を備えたプラスチックの分解装置を用いて、次にようにしてプラスチック成形品の分解処理をおこなう。   Using the plastic disassembling apparatus having the above configuration, the plastic molded product is disassembled as follows.

まずプラスチック成形品と水等の流体とを前処理槽１２に投入して十分に攪拌し、分解槽１に供給する。このようにプラスチック成形品と流体とを分解槽１に供給した後、分解槽１を密閉状態にし、プラスチック成形品と流体を攪拌装置１１で攪拌しながら加熱手段８で加熱する。   First, a plastic molded product and a fluid such as water are introduced into the pretreatment tank 12 and sufficiently stirred and supplied to the decomposition tank 1. After the plastic molded product and the fluid are supplied to the decomposition tank 1 in this manner, the decomposition tank 1 is sealed, and the plastic molded product and the fluid are heated by the heating unit 8 while being stirred by the stirring device 11.

そして、温度検出器９で分解槽１内の温度を、圧力検出手段１０で分解槽１内の圧力を、それぞれ検出しながら加熱手段８による加熱をおこない、検出された温度と圧力に応じて加熱を制御することによって、分解槽１内の流体が超臨界状態または亜臨界状態になる温度・圧力を維持し、この超臨界状態または亜臨界状態の流体を反応触媒としてプラスチック成形品を分解する。例えばプラスチック成形品として不飽和ポリエステル樹脂成形品を用い、流体として水を用いる場合、プラスチック成形品濃度１０〜５０ｗｔ％、分解温度１８０〜２６０℃、圧力１．０〜４．０ＭＰａに調整し、水を超臨界状態または亜臨界状態に維持して３０分〜４時間反応させる。これによって不飽和ポリエステル樹脂をエステル交換反応させ、スチレンマレイン酸共重合体や多価アルコール等のモノマーに加水分解することができる。   Then, heating is performed by the heating means 8 while detecting the temperature in the decomposition tank 1 by the temperature detector 9 and the pressure in the decomposition tank 1 by the pressure detection means 10, and heating is performed according to the detected temperature and pressure. By controlling the above, the temperature and pressure at which the fluid in the decomposition tank 1 becomes supercritical or subcritical is maintained, and the plastic molded product is decomposed using the fluid in the supercritical or subcritical state as a reaction catalyst. For example, when an unsaturated polyester resin molded product is used as the plastic molded product and water is used as the fluid, the concentration of the plastic molded product is adjusted to 10 to 50 wt%, the decomposition temperature is 180 to 260 ° C., and the pressure is 1.0 to 4.0 MPa. Is maintained in a supercritical state or a subcritical state and allowed to react for 30 minutes to 4 hours. Thus, the unsaturated polyester resin can be transesterified and hydrolyzed to a monomer such as a styrene maleic acid copolymer or a polyhydric alcohol.

所定の分解時間経過後、蒸気排出用配管２１の減圧弁２２を微開とし、分解槽１内の分解液６０の蒸気５０を蒸気排出用配管２１を通じて放出させ、分解槽１内の圧力を減圧していく。このように分解槽１内の圧力が減圧すると、上述したように、分解槽１内の分解液６０が気化し、その際の気化熱によって分解液６０の温度が下がり、分解液６０が冷却される。分解槽１内の液温が低下するにつれて、減圧弁２２の弁開度を大きくし、冷却効率の向上を図る。減圧弁２２の開放により分解槽１から放出された蒸気５０は洗浄槽２４内を通過するが、その際に洗浄槽２４内に収納されたプラスチック成形品を攪拌装置２８で攪拌しつつ蒸気５０と接触させ、プラスチック成形品の表面に付着した汚れ等を除去する。汚れ等を除去したプラスチック成形品は、被分解物として分解槽１に投入して上述した分解処理を施すようにする。前処理槽１２を設けている場合には前処理槽１２に投入して十分に攪拌した後、分解槽１に移送して上述した分解処理を施すようにする。洗浄槽２４内を通過した蒸気５０は、凝縮器４により冷却されて回収槽５に移送され、凝縮水として回収される。   After a predetermined decomposition time has elapsed, the pressure reducing valve 22 of the steam discharge pipe 21 is slightly opened, the vapor 50 of the decomposition liquid 60 in the decomposition tank 1 is released through the steam discharge pipe 21, and the pressure in the decomposition tank 1 is reduced. I will do it. When the pressure in the decomposition tank 1 is thus reduced, as described above, the decomposition liquid 60 in the decomposition tank 1 is vaporized, and the temperature of the decomposition liquid 60 is lowered by the vaporization heat at that time, and the decomposition liquid 60 is cooled. The As the liquid temperature in the decomposition tank 1 decreases, the valve opening degree of the pressure reducing valve 22 is increased to improve the cooling efficiency. The steam 50 released from the decomposition tank 1 by opening the pressure reducing valve 22 passes through the cleaning tank 24. At this time, the plastic 50 accommodated in the cleaning tank 24 is stirred by the stirring device 28 with the steam 50. Contact to remove dirt and the like adhering to the surface of the plastic molded product. The plastic molded product from which dirt and the like have been removed is put into the decomposition tank 1 as an object to be decomposed and subjected to the above-described decomposition process. In the case where the pretreatment tank 12 is provided, the mixture is introduced into the pretreatment tank 12 and sufficiently stirred, and then transferred to the decomposition tank 1 to perform the above-described decomposition treatment. The steam 50 that has passed through the cleaning tank 24 is cooled by the condenser 4, transferred to the recovery tank 5, and recovered as condensed water.

このようにして分解槽１内の分解液６０を冷却し、分解槽１の圧力が常圧またはその付近になった時点で分解液排出用配管３１の開閉弁３２を開放して分解槽１から分解液６０を排出する。開閉弁３２の開放により分解槽１から排出した分解液６０は洗浄槽３４内を通過する。その際に洗浄槽３４内に収納されたプラスチック成形品を攪拌装置３８で攪拌しつつ分解液６０と接触させ、プラスチック成形品の表面に付着した汚れ等を除去する。汚れ等を除去したプラスチック成形品は、被分解物として分解槽１に投入して上述した分解処理を施すようにする。前処理槽１２を設けている場合には前処理槽１２に投入して十分に攪拌した後、分解槽１に移送して上述した分解処理を施すようにする。洗浄槽３４内を通過した分解液６０は、分解液回収槽６に移送されて回収される。   In this way, the cracking liquid 60 in the cracking tank 1 is cooled, and when the pressure in the cracking tank 1 reaches normal pressure or in the vicinity thereof, the on-off valve 32 of the cracking liquid discharge pipe 31 is opened to remove the cracking liquid 1 from the cracking tank 1. The decomposition liquid 60 is discharged. The decomposition solution 60 discharged from the decomposition tank 1 by opening the on-off valve 32 passes through the cleaning tank 34. At that time, the plastic molded product accommodated in the cleaning tank 34 is brought into contact with the decomposition solution 60 while being stirred by the stirring device 38 to remove dirt and the like adhering to the surface of the plastic molded product. The plastic molded product from which dirt and the like have been removed is put into the decomposition tank 1 as an object to be decomposed and subjected to the above-described decomposition process. In the case where the pretreatment tank 12 is provided, the mixture is introduced into the pretreatment tank 12 and sufficiently stirred, and then transferred to the decomposition tank 1 to perform the above-described decomposition treatment. The decomposition liquid 60 that has passed through the cleaning tank 34 is transferred to the decomposition liquid recovery tank 6 and recovered.

図３は、本発明に係るプラスチックの分解装置における洗浄装置の別の一実施形態を示した概要構成図である。なお、図２に示した部分と同一の部分については同じ符号を付し、説明を省略する。   FIG. 3 is a schematic configuration diagram showing another embodiment of the cleaning device in the plastic decomposing apparatus according to the present invention. In addition, the same code | symbol is attached | subjected about the part same as the part shown in FIG. 2, and description is abbreviate | omitted.

図３（ａ）は蒸気排出用配管２１に設けられる洗浄装置２３であり、底部に蒸気導入口２５を備え上部に蒸気排出口２６を備えた洗浄槽２４で構成される。このような構成の洗浄装置２３においては、分解槽（図３（ａ）では図示なし）からの高温高圧の蒸気５０は蒸気排出用配管２１を通じて底部の蒸気導入口２５を介して洗浄槽２４内に導入され、洗浄槽２４内に導入された蒸気５０は上部の蒸気排出口２６を介して蒸気排出用配管２１を通じて排出される。洗浄槽２４内には試料設置板２７とその上方に試料流出防止板２９が配設されており、試料設置板２７と試料流出防止板２９とによって区画される空間に分解処理が施されていないプラスチック成形品が収納される。減圧弁（図３（ａ）では図示なし）を開放すると、分解槽からの高温高圧の蒸気５０が洗浄槽２４の下方から上方に向かって洗浄槽２４内を通過して収納されたプラスチック成形品と接触するが、その際、洗浄槽２４内に配設された試料流出防止板２９の存在により、蒸気排出口２６からのプラスチック成形品の流出が防止される。この試料流出防止板２９は、試料設置板２７と同様の構成のものが用いられる。   FIG. 3A shows a cleaning device 23 provided in the steam discharge pipe 21, which includes a cleaning tank 24 having a steam inlet 25 at the bottom and a steam outlet 26 at the top. In the cleaning device 23 having such a configuration, the high-temperature and high-pressure steam 50 from the decomposition tank (not shown in FIG. 3A) passes through the steam discharge pipe 21 and enters the cleaning tank 24 through the steam inlet 25 at the bottom. The steam 50 introduced into the cleaning tank 24 is discharged through the steam discharge pipe 21 through the upper steam discharge port 26. A sample installation plate 27 and a sample outflow prevention plate 29 are disposed above the cleaning tank 24, and the space defined by the sample installation plate 27 and the sample outflow prevention plate 29 is not decomposed. Plastic molded products are stored. When the pressure reducing valve (not shown in FIG. 3 (a)) is opened, a high-temperature and high-pressure steam 50 from the decomposition tank passes through the cleaning tank 24 from below to above and is stored in the cleaning tank 24. In this case, the presence of the sample outflow prevention plate 29 disposed in the cleaning tank 24 prevents the plastic molded product from flowing out of the vapor outlet 26. The sample outflow prevention plate 29 has the same configuration as the sample installation plate 27.

本実施形態では分解槽からの蒸気５０が洗浄槽２４内を下方から上方に向かって流れるが、この流れに接触する洗浄槽２４内のプラスチック成形品はその蒸気５０の流れに伴い上昇する一方でプラスチック成形品の重力により下降する力も働くため、洗浄槽２４内ではプラスチック成形品が効果的に攪拌される。これによって、プラスチック成形品と蒸気５０との接触効率が高まり、プラスチック成形品の表面の汚れ等が効果的に除去される。プラスチック成形品と蒸気５０との接触効率をさらに高めるために、攪拌装置２８を設けてもよい。   In the present embodiment, the steam 50 from the decomposition tank flows from the lower side to the upper side in the cleaning tank 24, but the plastic molded product in the cleaning tank 24 that contacts this flow rises with the flow of the steam 50. Since the force descending due to the gravity of the plastic molded product also works, the plastic molded product is effectively agitated in the cleaning tank 24. As a result, the contact efficiency between the plastic molded product and the vapor 50 is increased, and the surface of the plastic molded product is effectively removed. In order to further improve the contact efficiency between the plastic molded product and the steam 50, a stirring device 28 may be provided.

図３（ｂ）は分解液排出用配管３１に設けられる洗浄装置３３であり、底部に分解液導入口３５を備え上部に分解液排出口３６を備えた洗浄槽３４で構成される。洗浄槽３４内には試料設置板３７とその上方に、上述した試料流出防止板２９と同様の構成の試料流出防止板３９が配設されており、試料設置板３７と試料流出防止板３９とによって区画される空間に分解処理が施されていないプラスチック成形品が収納される。このような構成の洗浄装置３３においては、分解槽（図３（ｂ）では図示なし）からの分解液６０が洗浄槽３４内を下方から上方に向かって流れるため、上述した図３（ａ）の洗浄装置２３と同様、洗浄槽３４内ではプラスチック成形品が効果的に攪拌され、プラスチック成形品の表面の汚れ等が効果的に除去される。本実施形態においても、プラスチック成形品と分解液６０との接触効率をさらに高めるために、攪拌装置３８を設けてもよい。   FIG. 3B shows a cleaning device 33 provided in the decomposition liquid discharge pipe 31, which includes a cleaning tank 34 having a decomposition liquid inlet 35 at the bottom and a decomposition liquid outlet 36 at the top. In the cleaning tank 34, a sample installation plate 37 and a sample outflow prevention plate 39 having the same configuration as the sample outflow prevention plate 29 described above are disposed above the sample installation plate 37. A plastic molded product that has not been subjected to a decomposition process is accommodated in the space defined by. In the cleaning device 33 having such a configuration, the decomposition solution 60 from the decomposition tank (not shown in FIG. 3B) flows in the cleaning tank 34 from below to above, so that the above-described FIG. Like the cleaning device 23, the plastic molded product is effectively stirred in the cleaning tank 34, and the surface of the plastic molded product is effectively removed. Also in this embodiment, in order to further improve the contact efficiency between the plastic molded product and the decomposition solution 60, a stirring device 38 may be provided.

以上、実施形態に基づき本発明を説明したが、本発明は上記の実施形態に何ら限定されるものではなく、その要旨を逸脱しない範囲内において各種の変更が可能である。例えば、上記の実施形態では蒸気排出用配管と分解液排出用配管のそれぞれに洗浄装置を設けているが、蒸気排出用配管のみに洗浄装置を設けてもよいし、あるいは分解液排出用配管のみに洗浄装置を設けてもよい。また洗浄装置では洗浄槽の上部もしくは底部に導入口を設けて洗浄槽内に上方もしくは下方から蒸気や分解液を導入しているが、洗浄槽内に収納されたプラスチック成形品に蒸気や分解液を接触させることが可能であれば特に導入口の設置位置は限定されず、例えば、洗浄槽の側面に設けるようにしてもよい。さらに洗浄槽において攪拌装置のかわりにスライド式のプッシャを設置してプラスチック成形品を攪拌するようにしてもよい。   While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the cleaning device is provided for each of the steam discharge pipe and the decomposition liquid discharge pipe, but the cleaning device may be provided only for the steam discharge pipe, or only the decomposition liquid discharge pipe. A cleaning device may be provided. In the cleaning device, an inlet is provided at the top or bottom of the cleaning tank to introduce steam or decomposition liquid into the cleaning tank from above or below, but the steam or decomposition liquid is introduced into the plastic molded product stored in the cleaning tank. If it is possible to contact, the installation position of the introduction port is not particularly limited, and for example, it may be provided on the side surface of the cleaning tank. Further, instead of the stirring device, a slide type pusher may be installed in the washing tank to stir the plastic molded product.

本発明に係るプラスチックの分解装置の一実施形態を示した概要構成図である。It is the outline | summary block diagram which showed one Embodiment of the plastics decomposition | disassembly apparatus based on this invention. （ａ）はプラスチックの分解装置の蒸気排出部に設けられる洗浄装置の一実施形態を示した概要構成図であり、（ｂ）はプラスチックの分解装置の分解液排出部に設けられる洗浄装置の一実施形態を示した概要構成図である。(A) is a schematic block diagram which showed one Embodiment of the washing | cleaning apparatus provided in the vapor | steam discharge part of a plastics decomposition apparatus, (b) is one of the washing | cleaning apparatuses provided in the decomposition liquid discharge part of a plastics decomposition apparatus. It is the outline | summary block diagram which showed embodiment. （ａ）はプラスチックの分解装置の蒸気排出部に設けられる洗浄装置の別の一実施形態を示した概要構成図であり、（ｂ）はプラスチックの分解装置の分解液排出部に設けられる洗浄装置の別の一実施形態を示した概要構成図である。(A) is a schematic block diagram which showed another one Embodiment of the washing | cleaning apparatus provided in the vapor | steam discharge part of a plastics decomposition apparatus, (b) is the washing | cleaning apparatus provided in the decomposition liquid discharge part of a plastics decomposition apparatus It is the outline | summary block diagram which showed another one Embodiment of this.

符号の説明Explanation of symbols

１ 分解槽
２ 蒸気排出部
２１ 蒸気排出用配管
２２ 減圧弁
２３ 洗浄装置
２４ 洗浄槽
３ 分解液排出部
３１ 分解液排出用配管
３２ 開閉弁
３３ 洗浄装置
３４ 洗浄槽
５０ 蒸気
６０ 分解液 DESCRIPTION OF SYMBOLS 1 Decomposition tank 2 Steam discharge part 21 Steam discharge piping 22 Pressure reducing valve 23 Cleaning device 24 Cleaning tank 3 Decomposition liquid discharge part 31 Decomposition liquid discharge pipe 32 On-off valve 33 Cleaning apparatus 34 Cleaning tank 50 Steam 60 Decomposition liquid

Claims (3)

プラスチックを超臨界または亜臨界の状態で溶媒にて分解する分解槽と、分解槽内の蒸気を排出する蒸気排出部と、分解槽内の分解液を排出する分解液排出部を備えたプラスチックの分解装置において、
蒸気排出部および分解液排出部のうち少なくともいずれか一方の排出部に分解槽内からの蒸気または分解液でプラスチックを洗浄する洗浄装置が設けられていることを特徴とするプラスチックの分解装置。 A plastic tank equipped with a decomposition tank that decomposes the plastic with a solvent in a supercritical or subcritical state, a vapor discharge section that discharges the vapor in the decomposition tank, and a decomposition liquid discharge section that discharges the decomposition liquid in the decomposition tank In the decomposition device,
A plastic decomposing apparatus, wherein at least one of the steam discharging section and the decomposition liquid discharging section is provided with a cleaning device for cleaning the plastic with steam or decomposition liquid from the decomposition tank. 蒸気排出部および分解液排出部は各々、分解槽に接続される排出管で形成され、前記排出管の途中に洗浄装置が設けられ、前記洗浄装置は、分解槽からの蒸気または分解液の導入口、および排出口を有する、プラスチックを収納する洗浄槽を備えていることを特徴とする請求項１に記載のプラスチックの分解装置。   Each of the steam discharge section and the decomposition liquid discharge section is formed by a discharge pipe connected to the decomposition tank, and a cleaning device is provided in the middle of the discharge pipe. The cleaning apparatus introduces steam or decomposition liquid from the decomposition tank. The plastic disassembling apparatus according to claim 1, further comprising a cleaning tank that stores a plastic and has a mouth and a discharge port. プラスチックと溶媒を分解槽に投入して超臨界または亜臨界の状態でプラスチックを分解し、プラスチック分解後は、分解槽から高温高圧の蒸気を排出して分解槽を冷却しまたは分解槽から高温高圧の分解液を排出してこれを回収するプラスチックの分解処理方法において、
分解槽から排出する高温高圧の蒸気および分解液のうち少なくともいずれか一方の媒体にプラスチックを接触させて洗浄し、洗浄したプラスチックを被分解物として前記分解槽に投入して分解することを特徴とするプラスチックの分解処理方法。 Plastic and solvent are put into the decomposition tank and the plastic is decomposed in a supercritical or subcritical state. After the plastic is decomposed, high-temperature and high-pressure steam is discharged from the decomposition tank and the decomposition tank is cooled or high-temperature and high-pressure from the decomposition tank. In the plastic decomposition method of discharging and recovering the decomposition liquid,
The plastic is brought into contact with at least one of the high-temperature and high-pressure steam discharged from the decomposition tank and the decomposition liquid and washed, and the washed plastic is thrown into the decomposition tank as an object to be decomposed. How to disassemble plastic.
JP2008299458A 2008-11-25 2008-11-25 Apparatus for decomposing plastic and method for decomposing plastic using the same Pending JP2010126548A (en)

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