JP3792582B2 - Cleaning method and apparatus for chlorinated vinyl chloride resin - Google Patents

Cleaning method and apparatus for chlorinated vinyl chloride resin Download PDF

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JP3792582B2
JP3792582B2 JP2002044456A JP2002044456A JP3792582B2 JP 3792582 B2 JP3792582 B2 JP 3792582B2 JP 2002044456 A JP2002044456 A JP 2002044456A JP 2002044456 A JP2002044456 A JP 2002044456A JP 3792582 B2 JP3792582 B2 JP 3792582B2
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vinyl chloride
chloride resin
chlorinated vinyl
water
slurry
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JP2003238615A (en
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柳二 田村
隆昭 田中
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Tokuyama Sekisui Co Ltd
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Tokuyama Sekisui Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、塩素化塩化ビニル系樹脂の洗浄方法及びその装置に関する。
【０００２】
【従来の技術】
塩素化塩化ビニル系樹脂は、一般に塩化ビニル系樹脂を水懸濁状態で塩素化することにより製造されているが、塩素化する際に塩酸が副成される。
【０００３】
副成された塩酸は後工程である乾燥設備で除去することが可能であるが、塩酸耐蝕性を有する設備及び乾燥排気の塩酸処理設備が必要となり高価な設備となる。又、塩酸を中和剤を用いて中和した場合、中和後の残留金属塩が製品の品質に悪影響を及ぼすと共に、中和剤が高価なものにつくので一般に塩酸は水で洗浄除去されている。
【０００４】
従来から採用されている洗浄方法は流動洗浄法とデカンタ洗浄法である。流動洗浄法は、塩素化塩化ビニル系樹脂スラリーを洗浄槽に供給し、下部から洗浄水を通水し、攪拌して上部より塩酸排水をオーバーフローさせる方法であり、デカンタ洗浄法は塩素化塩化ビニル系樹脂スラリーを洗浄槽に供給し、水洗浄と遠心分離を繰り返す方法である。
【０００５】
【発明が解決しようとする課題】
しかし、上記洗浄方法の場合は洗浄装置が大きく設備費が非常に高く、洗浄する際には洗浄水が大量に必要であるという欠点があった。
【０００６】
本発明の目的は、上記欠点に鑑み、塩素化塩化ビニル系樹脂スラリーを小型の装置で、少量の洗浄水で洗浄することのできる洗浄方法及び洗浄装置を提供することにある。
【０００７】
【課題を解決するための手段】
すなわち、本発明は、塩素化塩化ビニル系樹脂スラリーを、濾過手段を有する洗浄槽に供給・濾過してケーキ層を形成する第１工程、ケーキ層に、洗浄槽の上部から洗浄水を供給し、洗浄・濾過し、再度ケーキ層を形成する第２工程及び洗浄されたケーキ層の下部であって、濾過手段の上部近傍に開口している塩素化塩化ビニル系樹脂スラリー移送配管から水を供給してケーキ層下部の塩素化塩化ビニル系樹脂をスラリー状にした後、洗浄槽上部から水を供給しながら洗浄された塩素化塩化ビニル系樹脂スラリーを、該塩素化塩化ビニル系樹脂スラリー移送配管で洗浄槽から抜き出す第３工程からなることを特徴とする塩素化塩化ビニル系樹脂の洗浄方法を提供するものである。
【０００８】
また、本発明は、上端部付近に塩素化塩化ビニル系樹脂スラリー供給配管と洗浄水供給配管が設置され、下端部付近に洗浄水除去配管が設置されている洗浄槽の、下部であって洗浄水除去配管より上方に濾過手段が設置されると共に濾過手段の上部近傍に、塩素化塩化ビニル系樹脂ケーキ層の下部に該ケーキをスラリー化するための水を供給し、スラリ−化された塩素化塩化ビニル系樹脂スラリーを移送するための開口部を有する塩素化塩化ビニル系樹脂スラリー移送配管が設置されており、塩素化塩化ビニル系樹脂スラリー移送配管には水供給配管が接続されていることを特徴とする塩素化塩化ビニル系樹脂の洗浄装置を提供するものである。
【０００９】
【発明の実施の形態】
請求項１記載の塩素化塩化ビニル系樹脂の洗浄方法は、塩素化塩化ビニル系樹脂スラリーを、濾過手段を有する洗浄槽に供給・濾過してケーキ層を形成する第１工程、ケーキ層に、洗浄槽の上部から洗浄水を供給し、洗浄・濾過し、再度ケーキ層を形成する第２工程及び洗浄されたケーキ層の下部であって、濾過手段の上部近傍に開口している塩素化塩化ビニル系樹脂スラリー移送配管から水を供給してケーキ層下部の塩素化塩化ビニル系樹脂をスラリー状にした後、洗浄槽上部から水を供給しながら洗浄された塩素化塩化ビニル系樹脂スラリーを、該塩素化塩化ビニル系樹脂スラリー移送配管で洗浄槽から抜き出す第３工程からなることを特徴とする。
【００１０】
本発明で使用される塩素化塩化ビニル系樹脂スラリーは、塩化ビニル系樹脂の懸濁液に塩素を供給し、塩化ビニル系樹脂を塩素化して得られたスラリーであり、一般に塩素化塩化ビニル系樹脂と塩酸と水からなる。
【００１１】
上記塩化ビニル系樹脂は、塩化ビニルモノマー単独重合体若しくは塩化ビニルモノマーを主体（５０重量％以上含む）とする、塩化ビニルモノマーと共重合可能なビニルモノマーとの共重合体である。
【００１２】
上記ビニルモノマーとしては、例えば、酢酸ビニル、プロピオン酸ビニル等のビニルエステル；メチル（メタ）アクリレート、エチル（メタ）アクリレート等のアルキル（メタ）アクリレートモノマー；エチレン、プロピレン等のオレフィン；（メタ）アクリル酸、無水マレイン酸、アクリロニトリル、スチレン、塩化ビニリデンなどがあげられる。
【００１３】
本発明における第１工程は、上記塩素化塩化ビニル系樹脂スラリーを、濾過手段を有する洗浄槽に供給・濾過してケーキ層を形成する工程である。
【００１４】
上記濾過手段としては、一般に濾材が使用されるが、濾材としては上記塩素化塩化ビニル系樹脂を濾過しうるものであればよく、例えば、織布、不織布、ガラス繊維、金網、有孔金属板、セラミックス多孔体等があげられる。
【００１５】
上記洗浄槽は、濾過手段が洗浄槽の下部に設けられているのが好ましく、スラリー中には塩酸が存在するので、耐酸性の材料で製造されているのが好ましい。
【００１６】
洗浄槽に塩素化塩化ビニル系樹脂スラリーを供給すると、濾過手段により濾過されて、水及び塩酸は除去され、濾過手段の上にケーキ層が形成される。
【００１７】
本発明における第２工程は、ケーキ層に、洗浄槽の上部から洗浄水を供給し、洗浄・濾過し、再度ケーキ層を形成する工程である。この工程はケーキ層中の塩酸が除去されるまで１回又は複数回行われる。
【００１８】
濾過すると、ケーキ層中の水位は次第に低下していく。ケーキ層の水位が高い時に洗浄水を供給するとケーキ層中の塩酸が洗浄水中に拡散して洗浄効果が低下するので、ケーキ層中の水位がケーキ層表面から５ｃｍ以下に低下してから洗浄水を供給するのが好ましい。
【００１９】
本発明における第３工程は、洗浄されたケーキ層の下部であって、濾過手段の上部近傍に開口している塩素化塩化ビニル系樹脂スラリー移送配管から水を供給してケーキ層下部の塩素化塩化ビニル系樹脂をスラリー状にした後、洗浄槽上部から水を供給しながら洗浄された塩素化塩化ビニル系樹脂スラリーを、該塩素化塩化ビニル系樹脂スラリー移送配管で洗浄槽から抜き出す工程である。
【００２０】
洗浄された塩素化塩化ビニル系樹脂は抜き出して乾燥する必要があるが、ケーキになった塩素化塩化ビニル系樹脂は容易に抜き出すことができないので、再度スラリー状にして抜き出す。
【００２１】
ケーキになった塩素化塩化ビニル系樹脂に上部から水を供給したのでは、スラリー化に時間がかかり抜き出しにくいので、ケーキ層の下部であって、濾過手段の上部近傍に開口している塩素化塩化ビニル系樹脂スラリー移送配管から水を供給してケーキ層下部の塩素化塩化ビニル系樹脂をスラリー状にした後、洗浄槽上部から水を供給して残りのケーキ層をスラリー状にして抜き出す。
【００２２】
スラリー状になった塩素化塩化ビニル系樹脂を抜き出すには、ポンプで抜き出してもよいし、洗浄槽上部から加圧して抜き出してもよいが、濾過手段の上部近傍に開口した塩素化塩化ビニル系樹脂スラリー移送配管によって抜き出す。即ち、塩素化塩化ビニル系樹脂スラリー移送配管から供給された水によってスラリー化されたケーキ層下部の塩素化塩化ビニル系樹脂スラリーを抜き出し、次いで、洗浄槽上部から供給された水で残りのケーキ層をスラリー状にして抜き出す。
【００２３】
請求項２に記載の塩素化塩化ビニル系樹脂の洗浄装置は、上端部付近に塩素化塩化ビニル系樹脂スラリー供給配管と洗浄水供給配管が設置され、下端部付近に洗浄水除去配管が設置されている洗浄槽の、下部であって洗浄水除去配管より上方に濾過手段が設置されると共に濾過手段の上部近傍に、塩素化塩化ビニル系樹脂ケーキ層の下部に該ケーキをスラリー化するための水を供給し、スラリ−化された塩素化塩化ビニル系樹脂スラリーを移送するための開口部を有する塩素化塩化ビニル系樹脂スラリー移送配管が設置されており、塩素化塩化ビニル系樹脂スラリー移送配管には水供給配管が接続されていることを特徴とする。
【００２４】
上記塩素化塩化ビニル系樹脂の洗浄装置は、請求項１記載の洗浄方法を実施するのに好適な洗浄装置である。本発明の洗浄装置を図面を参照して説明する。図１は本発明の洗浄装置の一例を示す模式図である。
【００２５】
図中１は内面がチタンコーティングされている洗浄槽である。洗浄槽１の上端部にバルブ２１を介して塩素化塩化ビニル系樹脂の反応槽（図示せず）と接続されている塩素化塩化ビニル系樹脂スラリー供給配管２と、バルブ３１を介して洗浄水供給配管３が接続されている。
【００２６】
４は、洗浄槽１の下端部に設置されている洗浄水除去配管であり、洗浄水除去配管４の途中にもバルブ４１が設置されている。５は濾材であり、洗浄槽１内であって、洗浄水除去配管４の上部に設置されている。
【００２７】
６は、開口部６２が濾材５の上部近傍であって、塩素化塩化ビニル系樹脂ケーキ層の下部に該ケーキをスラリー化するための水を供給し、スラリ−化された塩素化塩化ビニル系樹脂スラリーを移送しうる位置に設置された塩素化塩化ビニル系樹脂スラリー移送配管であり、塩素化塩化ビニル系樹脂スラリー移送配管６はバルブ６１を介して乾燥装置（図示せず）に接続されている。
【００２８】
７は、バルブ７１を介して洗浄水供給配管３と、塩素化塩化ビニル系樹脂スラリー移送配管６のバルブ６１より開口部６２側に接続されている水供給配管である。
【００２９】
尚、８は、洗浄槽１の上部に設置された窒素供給配管であり、バルブ８１を介して窒素ボンベ（図示せず）と接続されている。
【００３０】
次に、上記洗浄装置で塩素化塩化ビニル系樹脂を洗浄する方法を説明する。
まず、バルブ３１、６１及び８１を閉鎖し、バルブ２１及び４１を開放して塩素化塩化ビニル系樹脂スラリー供給配管２から洗浄槽１に塩素化塩化ビニル系樹脂スラリーを供給する。
【００３１】
供給された塩素化塩化ビニル系樹脂スラリーは濾材５で濾過され、濾材５にケーキ層が形成され濾過された水は洗浄水除去配管４から除去される。この時、塩酸水が水供給配管７に入らないようにバルブ７１を少し開放して洗浄水を少量ずつ流し続けるのが好ましい。
【００３２】
次に、バルブ２１を閉鎖すると共にバルブ３１を開放し、洗浄水供給配管３からケーキ層に洗浄水を供給して塩素化塩化ビニル樹脂を洗浄し、濾過して再度ケーキ層を形成する。洗浄水の供給は塩素化塩化ビニル樹脂から塩酸が除去されるまで１回若しくは複数回行う。
【００３３】
尚、前述の通り、洗浄水の供給はケーキ層中の水位がケーキ層表面から５ｃｍ以下に低下してから行うのが好ましく、この工程中も、塩酸水が水供給配管７に入らないようにバルブ７１を少し開放して洗浄水を少量ずつ流し続けるのが好ましい。又、濾過を速やかに行うために、バルブ８１を開放して窒素を供給し加圧してもよい。
【００３４】
洗浄された塩素化塩化ビニル系樹脂は乾燥装置に移送され乾燥されるが、移送するには、まず、バルブ３１及び４１を閉鎖し、バルブ７１をゆるめ水供給配管７からの水の供給量を増加し、濾材５の上部近傍であって、塩素化塩化ビニル系樹脂ケーキ層の下部にである、塩素化塩化ビニル系樹脂スラリー移送配管６の開口部６２付近のケーキをスラリー化する。
【００３５】
次に、バルブ７１を閉鎖すると共にバルブ３１を開放して水を供給してケーキ層全体をスラリー化する。バルブ３１の開放と同時若しくは直後にバルブ６１を開放して、再度スラリー化された塩素化塩化ビニル系樹脂スラリーを塩素化塩化ビニル系樹脂スラリー移送配管６を通して乾燥装置に移送する。
【００３６】
スラリーの移送は、塩素化塩化ビニル系樹脂スラリー移送配管６の途中にポンプを設けてもよいし、バルブ８１を開放して窒素で加圧することによって行ってもよい。
【００３７】
【発明の効果】
請求項１記載の塩素化塩化ビニル系樹脂の洗浄方法は、上述の通りであるから、塩素化塩化ビニル系樹脂スラリーを小型の装置で、少量の洗浄水で洗浄することのできる。
【００３８】
又、請求項２記載の塩素化塩化ビニル系樹脂の洗浄装置は、上述の通りであるから、装置が小型であり設備コストが安価であり、少量の洗浄水で効率よく洗浄することができる。
【００３９】
【図面の簡単な説明】
【図１】 本発明の洗浄装置の一例を示す模式図である。
【符号の説明】
１ 洗浄槽
２ 塩素化塩化ビニル系樹脂スラリー供給配管
３ 洗浄水供給配管
４ 洗浄水除去配管
５ 濾材
６ 塩素化塩化ビニル系樹脂スラリー移送配管
７ 水供給配管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for cleaning a chlorinated vinyl chloride resin.
[0002]
[Prior art]
A chlorinated vinyl chloride resin is generally produced by chlorinating a vinyl chloride resin in a water suspension state, and hydrochloric acid is by-produced when chlorinated.
[0003]
The by-produced hydrochloric acid can be removed by a drying facility, which is a post-process, but a facility having hydrochloric acid corrosion resistance and a hydrochloric acid treatment facility for dry exhaust are required, resulting in an expensive facility. In addition, when neutralizing hydrochloric acid with a neutralizing agent, the residual metal salt after neutralization adversely affects the quality of the product and the neutralizing agent is expensive, so hydrochloric acid is generally washed away with water. ing.
[0004]
Conventionally employed cleaning methods are a fluidized cleaning method and a decanter cleaning method. The fluid cleaning method is a method in which a chlorinated vinyl chloride resin slurry is supplied to a cleaning tank, the cleaning water is passed from the lower part, and stirred to allow the hydrochloric acid waste water to overflow from the upper part. The decanter cleaning method is a chlorinated vinyl chloride method. This is a method in which a system resin slurry is supplied to a washing tank and water washing and centrifugation are repeated.
[0005]
[Problems to be solved by the invention]
However, in the case of the above-described cleaning method, the cleaning device is large and the equipment cost is very high, and there is a drawback that a large amount of cleaning water is required for cleaning.
[0006]
In view of the above-described drawbacks, an object of the present invention is to provide a cleaning method and a cleaning apparatus that can clean a chlorinated vinyl chloride resin slurry with a small amount of cleaning water using a small-sized apparatus.
[0007]
[Means for Solving the Problems]
That is, the present invention is a first step of supplying and filtering a chlorinated vinyl chloride resin slurry to a washing tank having a filtering means to form a cake layer, and supplying washing water from the upper part of the washing tank to the cake layer. Water is supplied from a chlorinated vinyl chloride resin slurry transfer pipe which is opened in the lower part of the cleaned cake layer and in the vicinity of the upper part of the filter means, after washing and filtering to form a cake layer again. The slurry of the chlorinated vinyl chloride resin at the bottom of the cake layer is made into a slurry, and then the chlorinated vinyl chloride resin slurry washed while supplying water from the upper part of the washing tank is transferred to the chlorinated vinyl chloride resin slurry transfer pipe. The present invention provides a method for cleaning a chlorinated vinyl chloride resin characterized by comprising a third step of extracting from a cleaning tank.
[0008]
Further, the present invention is a cleaning method in the lower part of the washing tank in which the chlorinated vinyl chloride resin slurry supply pipe and the washing water supply pipe are installed near the upper end and the washing water removal pipe is installed near the lower end. A filtration means is installed above the water removal pipe, and water for slurrying the cake is supplied to the lower part of the chlorinated vinyl chloride resin cake layer in the vicinity of the upper part of the filtration means. A chlorinated vinyl chloride resin slurry transfer pipe having an opening for transferring the chlorinated vinyl chloride resin slurry is installed, and a water supply pipe is connected to the chlorinated vinyl chloride resin slurry transfer pipe A cleaning device for chlorinated vinyl chloride resin characterized by the above.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The method for cleaning a chlorinated vinyl chloride resin according to claim 1 is a first step of forming a cake layer by supplying and filtering a chlorinated vinyl chloride resin slurry to a cleaning tank having a filtering means. The second step of supplying washing water from the upper part of the washing tank, washing and filtering, and forming the cake layer again, and the lower part of the washed cake layer, which is opened near the upper part of the filtering means After supplying water from the vinyl resin slurry transfer pipe to make the chlorinated vinyl chloride resin at the bottom of the cake layer into a slurry state, the chlorinated vinyl chloride resin slurry washed while supplying water from the upper part of the washing tank, It consists of the 3rd process extracted from a washing tank by this chlorinated vinyl chloride resin slurry transfer piping.
[0010]
The chlorinated vinyl chloride resin slurry used in the present invention is a slurry obtained by supplying chlorine to a suspension of vinyl chloride resin and chlorinating the vinyl chloride resin, and is generally a chlorinated vinyl chloride resin slurry. Consists of resin, hydrochloric acid and water.
[0011]
The vinyl chloride resin is a vinyl chloride monomer homopolymer or a copolymer of vinyl chloride monomer and a vinyl monomer copolymerizable with a vinyl chloride monomer mainly (including 50% by weight or more).
[0012]
Examples of the vinyl monomer include vinyl esters such as vinyl acetate and vinyl propionate; alkyl (meth) acrylate monomers such as methyl (meth) acrylate and ethyl (meth) acrylate; olefins such as ethylene and propylene; (meth) acrylic Examples thereof include acid, maleic anhydride, acrylonitrile, styrene, and vinylidene chloride.
[0013]
The first step in the present invention is a step of forming a cake layer by supplying and filtering the chlorinated vinyl chloride resin slurry to a washing tank having a filtering means.
[0014]
As the filtering means, a filter medium is generally used, but any filter medium that can filter the chlorinated vinyl chloride resin may be used. For example, woven cloth, non-woven cloth, glass fiber, wire mesh, perforated metal plate And ceramic porous bodies.
[0015]
In the washing tank, the filtering means is preferably provided in the lower part of the washing tank, and since hydrochloric acid is present in the slurry, the washing tank is preferably made of an acid-resistant material.
[0016]
When the chlorinated vinyl chloride resin slurry is supplied to the washing tank, it is filtered by the filtering means, water and hydrochloric acid are removed, and a cake layer is formed on the filtering means.
[0017]
The second step in the present invention is a step of supplying the cake layer with washing water from the upper part of the washing tank, washing and filtering, and forming the cake layer again. This step is performed once or a plurality of times until hydrochloric acid in the cake layer is removed.
[0018]
When filtered, the water level in the cake layer gradually decreases. If washing water is supplied when the water level of the cake layer is high, the hydrochloric acid in the cake layer diffuses into the washing water and the washing effect is lowered. Therefore, the washing water is lowered after the water level in the cake layer is lowered to 5 cm or less from the cake layer surface. Is preferably supplied.
[0019]
The third step in the present invention is the chlorination of the lower portion of the cake layer by supplying water from the chlorinated vinyl chloride resin slurry transfer pipe which is open in the vicinity of the upper portion of the filtered cake layer. This is a step of making a chlorinated vinyl chloride resin slurry washed while supplying water from the upper part of the washing tank and then extracting the chlorinated vinyl chloride resin slurry from the washing tank through the chlorinated vinyl chloride resin slurry transfer pipe after making the vinyl chloride resin into a slurry state. .
[0020]
The washed chlorinated vinyl chloride resin needs to be extracted and dried. However, since the chlorinated vinyl chloride resin in the form of cake cannot be easily extracted, it is extracted again as a slurry.
[0021]
If water is supplied from the top to the chlorinated vinyl chloride resin in the form of a cake, it takes a long time to make a slurry and it is difficult to pull out, so chlorination is open at the bottom of the cake layer and near the top of the filtration means. Water is supplied from the vinyl chloride resin slurry transfer pipe to make the chlorinated vinyl chloride resin in the lower part of the cake layer into a slurry, and then water is supplied from the upper part of the washing tank to remove the remaining cake layer in the form of a slurry.
[0022]
To extract the chlorinated vinyl chloride resin in the form of a slurry, it may be extracted with a pump, or it may be extracted with pressure from the upper part of the washing tank, but the chlorinated vinyl chloride system opened near the upper part of the filtration means Extracted by resin slurry transfer piping. That is, the chlorinated vinyl chloride resin slurry at the bottom of the cake layer slurried with water supplied from the chlorinated vinyl chloride resin slurry transfer pipe is extracted, and then the remaining cake layer with the water supplied from the top of the washing tank Is extracted as a slurry.
[0023]
The cleaning device for chlorinated vinyl chloride resin according to claim 2 has a chlorinated vinyl chloride resin slurry supply pipe and a wash water supply pipe installed near the upper end, and a wash water removal pipe installed near the lower end. A filtration means is installed in the lower part of the washing tank and above the washing water removing pipe, and the cake is slurried in the vicinity of the upper part of the filtration means at the lower part of the chlorinated vinyl chloride resin cake layer. A chlorinated vinyl chloride resin slurry transfer pipe having an opening for supplying water and transferring the slurryed chlorinated vinyl chloride resin slurry is installed. A water supply pipe is connected to the.
[0024]
The chlorinated vinyl chloride resin cleaning device is a cleaning device suitable for carrying out the cleaning method according to claim 1. The cleaning apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an example of the cleaning apparatus of the present invention.
[0025]
In the figure, reference numeral 1 denotes a cleaning tank whose inner surface is coated with titanium. A chlorinated vinyl chloride resin slurry supply pipe 2 connected to a reaction tank (not shown) of a chlorinated vinyl chloride resin via a valve 21 at the upper end of the cleaning tank 1 and a wash water via a valve 31. A supply pipe 3 is connected.
[0026]
4 is a washing water removing pipe installed at the lower end of the washing tank 1, and a valve 41 is also installed in the middle of the washing water removing pipe 4. Reference numeral 5 denotes a filter medium, which is installed in the cleaning tank 1 and above the cleaning water removing pipe 4.
[0027]
6, the opening 62 is in the vicinity of the upper part of the filter medium 5, and water for slurrying the cake is supplied to the lower part of the chlorinated vinyl chloride resin cake layer to form a slurry of the chlorinated vinyl chloride system. This is a chlorinated vinyl chloride resin slurry transfer pipe installed at a position where the resin slurry can be transferred. The chlorinated vinyl chloride resin slurry transfer pipe 6 is connected to a drying device (not shown) via a valve 61. Yes.
[0028]
7 is a water supply pipe connected to the opening 62 side from the valve 61 of the cleaning water supply pipe 3 and the chlorinated vinyl chloride resin slurry transfer pipe 6 via the valve 71.
[0029]
Reference numeral 8 denotes a nitrogen supply pipe installed in the upper part of the cleaning tank 1, and is connected to a nitrogen cylinder (not shown) via a valve 81.
[0030]
Next, a method for cleaning the chlorinated vinyl chloride resin with the above-described cleaning apparatus will be described.
First, the valves 31, 61 and 81 are closed, the valves 21 and 41 are opened, and the chlorinated vinyl chloride resin slurry is supplied to the cleaning tank 1 from the chlorinated vinyl chloride resin slurry supply pipe 2.
[0031]
The supplied chlorinated vinyl chloride resin slurry is filtered by the filter medium 5, a cake layer is formed on the filter medium 5, and the filtered water is removed from the washing water removing pipe 4. At this time, it is preferable that the valve 71 is opened a little and the washing water is kept flowing little by little so that the hydrochloric acid water does not enter the water supply pipe 7.
[0032]
Next, the valve 21 is closed and the valve 31 is opened, washing water is supplied to the cake layer from the washing water supply pipe 3 to wash the chlorinated vinyl chloride resin, and the cake layer is formed again by filtration. The cleaning water is supplied once or a plurality of times until hydrochloric acid is removed from the chlorinated vinyl chloride resin.
[0033]
As described above, the washing water is preferably supplied after the water level in the cake layer is lowered to 5 cm or less from the surface of the cake layer. During this process, the hydrochloric acid water does not enter the water supply pipe 7. It is preferable that the valve 71 is opened a little and the washing water is kept flowing little by little. Further, in order to perform filtration quickly, the valve 81 may be opened and nitrogen may be supplied and pressurized.
[0034]
The washed chlorinated vinyl chloride resin is transferred to a drying device and dried. To transfer, the valves 31 and 41 are closed, the valve 71 is loosened, and the amount of water supplied from the water supply pipe 7 is reduced. The cake near the opening 62 of the chlorinated vinyl chloride resin slurry transfer pipe 6, which is near the upper part of the filter medium 5 and below the chlorinated vinyl chloride resin cake layer, is slurried.
[0035]
Next, the valve 71 is closed and the valve 31 is opened to supply water to make the entire cake layer into a slurry. Simultaneously with or immediately after the opening of the valve 31, the valve 61 is opened, and the chlorinated vinyl chloride resin slurry that has been slurried again is transferred to the drying device through the chlorinated vinyl chloride resin slurry transfer pipe 6.
[0036]
The slurry may be transferred by providing a pump in the middle of the chlorinated vinyl chloride resin slurry transfer pipe 6, or by opening the valve 81 and pressurizing with nitrogen.
[0037]
【The invention's effect】
Since the cleaning method of the chlorinated vinyl chloride resin according to claim 1 is as described above, the chlorinated vinyl chloride resin slurry can be cleaned with a small amount of cleaning water by a small apparatus.
[0038]
Further, since the cleaning apparatus for chlorinated vinyl chloride resin according to claim 2 is as described above, the apparatus is small in size and the equipment cost is low, and can be efficiently cleaned with a small amount of cleaning water.
[0039]
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a cleaning apparatus of the present invention.
[Explanation of symbols]
1 Washing tank 2 Chlorinated vinyl chloride resin slurry supply pipe 3 Wash water supply pipe 4 Wash water removal pipe 5 Filter medium 6 Chlorinated vinyl chloride resin slurry transfer pipe 7 Water supply pipe

Claims (2)

塩素化塩化ビニル系樹脂スラリーを、濾過手段を有する洗浄槽に供給・濾過してケーキ層を形成する第１工程、ケーキ層に、洗浄槽の上部から洗浄水を供給し、洗浄・濾過し、再度ケーキ層を形成する第２工程及び洗浄されたケーキ層の下部であって、濾過手段の上部近傍に開口している塩素化塩化ビニル系樹脂スラリー移送配管から水を供給してケーキ層下部の塩素化塩化ビニル系樹脂をスラリー状にした後、洗浄槽上部から水を供給しながら洗浄された塩素化塩化ビニル系樹脂スラリーを、該塩素化塩化ビニル系樹脂スラリー移送配管で洗浄槽から抜き出す第３工程からなることを特徴とする塩素化塩化ビニル系樹脂の洗浄方法。A first step of supplying and filtering a chlorinated vinyl chloride resin slurry to a washing tank having a filtering means to form a cake layer, supplying washing water from the upper part of the washing tank to the cake layer, washing and filtering, The second step of forming the cake layer again and the lower part of the washed cake layer, water is supplied from a chlorinated vinyl chloride resin slurry transfer pipe opened near the upper part of the filtering means, After the chlorinated vinyl chloride resin is made into a slurry, the chlorinated vinyl chloride resin slurry washed while supplying water from the upper part of the washing tank is extracted from the washing tank by the chlorinated vinyl chloride resin slurry transfer pipe . A cleaning method for a chlorinated vinyl chloride resin characterized by comprising three steps. 上端部付近に塩素化塩化ビニル系樹脂スラリー供給配管と洗浄水供給配管が設置され、下端部付近に洗浄水除去配管が設置されている洗浄槽の、下部であって洗浄水除去配管より上方に濾過手段が設置されると共に濾過手段の上部近傍に、塩素化塩化ビニル系樹脂ケーキ層の下部に該ケーキをスラリー化するための水を供給し、スラリ−化された塩素化塩化ビニル系樹脂スラリーを移送するための開口部を有する塩素化塩化ビニル系樹脂スラリー移送配管が設置されており、塩素化塩化ビニル系樹脂スラリー移送配管には水供給配管が接続されていることを特徴とする塩素化塩化ビニル系樹脂の洗浄装置。A chlorinated vinyl chloride resin slurry supply pipe and a wash water supply pipe are installed near the upper end, and a wash water removal pipe is installed near the lower end of the wash tank, above the wash water removal pipe A slurry of chlorinated vinyl chloride resin slurry is provided by supplying water for slurrying the cake to the lower part of the chlorinated vinyl chloride resin cake layer in the vicinity of the upper part of the filter means while the filtration means is installed. A chlorinated vinyl chloride resin slurry transfer pipe having an opening for transferring water is installed, and a water supply pipe is connected to the chlorinated vinyl chloride resin slurry transfer pipe. Cleaning equipment for vinyl chloride resin.
JP2002044456A 2002-02-21 2002-02-21 Cleaning method and apparatus for chlorinated vinyl chloride resin Expired - Lifetime JP3792582B2 (en)

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US7345114B2 (en) 2006-01-26 2008-03-18 Kaneka Corporation Method for producing chlorinated vinyl chloride resin
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