JP4484635B2 - スパイラル型逆浸透膜エレメント、およびその製造方法 - Google Patents
スパイラル型逆浸透膜エレメント、およびその製造方法 Download PDFInfo
- Publication number
- JP4484635B2 JP4484635B2 JP2004255779A JP2004255779A JP4484635B2 JP 4484635 B2 JP4484635 B2 JP 4484635B2 JP 2004255779 A JP2004255779 A JP 2004255779A JP 2004255779 A JP2004255779 A JP 2004255779A JP 4484635 B2 JP4484635 B2 JP 4484635B2
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- Prior art keywords
- reverse osmosis
- spiral
- membrane element
- osmosis membrane
- porous support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
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- B01D2325/26—Electrical properties
Description
即ち、本発明によれば、封止樹脂を分離膜に於けるスキン層の少なくとも近傍にまで含浸させることにより、封止部のシール性を向上させる。その結果、供給側流路から透過側流路に原流体が微小リークするのを効果的に防止することができ、分離対象物質の阻止率を向上させて分離性能を良好なものとすることができる。
(実施例1)
(実施例2)
(比較例1)
(比較例2)
図4に示すグラフから明らかな様に、実施例1及び2に係るスパイラル型逆浸透膜エレメントの場合、封止部分近傍(封止部分からの距離が0〜5cmの範囲内)の透過水の電気伝導率は、内部(封止部分からの距離が5〜90cmの範囲内)の透過水の電気伝導率の2倍以内であり、良好な塩阻止率を示していることが分かる。その一方、比較例1及び2に係るスパイラル型逆浸透膜エレメントの場合、封止部分近傍の透過水の電気伝導率は、内部の透過水の電気伝導率と比較して2倍を超えており、塩阻止率が高く分離性能が劣っていることが分かる。
2 供給側流路材
3 透過側流路材
4 接着剤
5 中心管
6 接着剤
11 両端封止部
12 外周側封止部
R 円筒状巻回体
U 分離膜ユニット
Claims (9)
- 分離膜と供給側流路材と透過側流路材とが積層状態で有孔の中心管の周囲にスパイラル状に巻回された円筒状巻回体を備えると共に、供給側流体と透過側流体の混合を防ぐための封止部が設けられているスパイラル型逆浸透膜エレメントであって、
前記透過側流路材を介して対向する分離膜は、不織布層上に多孔性支持体及びスキン層が順次積層された構造を有し、
前記分離膜の縁部には封止樹脂により封止された封止部が設けられており、
前記封止樹脂は、多孔性支持体に於いてスキン層まで含浸されており、
前記不織布層の外側面、及び不織布層が複数層からなる場合には各層間には、前記封止樹脂の含浸を阻害するバリア部が設けられておらず、
かつ、前記不織布層の前記多孔性支持体と接する側には、当該多孔性支持体を構成するポリマーが3〜6g/m 2 の含浸量で含浸されていることを特徴とするスパイラル型逆浸透膜エレメント。 - 請求項1に記載のスパイラル型逆浸透膜エレメントであって、
前記不織布層の平均孔径は8〜12μmであり、かつ平均孔径と最大孔径の比(最大孔径/平均孔径)は1〜4であることを特徴とするスパイラル型逆浸透膜エレメント。 - 請求項1又は2に記載のスパイラル型逆浸透膜エレメントであって、
前記多孔性支持体の厚さは30〜60μmであることを特徴とするスパイラル型逆浸透膜エレメント。 - 請求項1〜3の何れか1項に記載のスパイラル型逆浸透膜エレメントであって、
前記分離膜は、前記封止部のスキン層側に於ける面の画像データをしきい値230で二値化処理した場合に、処理後の画像データの黒レベルが60%以上となるまで前記ポリマーを前記多孔性支持体に含浸したものであることを特徴とするスパイラル型逆浸透膜エレメント。 - 請求項1〜4の何れか1項に記載のスパイラル型逆浸透膜エレメントであって、
前記分離膜は、前記封止部の不織布層側に於ける面のヘイズ値が20%以上になるまで前記ポリマーを前記多孔性支持体に含浸したものであることを特徴とするスパイラル型逆浸透膜エレメント。 - 不織布層上に多孔性支持体及びスキン層が順次積層された分離膜と供給側流路材と透過側流路材とが積層状態で有孔の中心管の周囲にスパイラル状に巻回された円筒状巻回体を備えると共に、供給側流体と透過側流体の混合を防ぐための封止部が設けられているスパイラル型逆浸透膜エレメントの製造方法であって、
前記不織布層上に前記多孔性支持体を構成するポリマーを塗布し、かつ、当該ポリマーを含浸量が3〜6g/m2の範囲内になる様に含浸させた後、乾燥させて多孔性支持体を形成する工程と、
前記多孔性支持体上にスキン層を製膜して分離膜を形成する工程と、
前記分離膜と供給側流路材と透過側流路材とを積層状態で有孔の中心管の周囲にスパイラル状に巻回して円筒状巻回体を形成する工程と、
前記供給側流体と透過側流体の混合を防ぐため、透過側流路材を介して対向する分離膜の縁部に、多孔性支持体側から封止樹脂を塗布し、かつ封止樹脂をスキン層まで含浸させて封止する工程とを有し、
前記不織布層として、その外側面、及び不織布層が複数層からなる場合には各層間に、前記封止樹脂の含浸を阻害するバリア部が設けられていないものを使用することを特徴とするスパイラル型逆浸透膜エレメントの製造方法。 - 請求項6に記載のスパイラル型逆浸透膜エレメントの製造方法であって、
前記分離膜の形成工程の前に、2以上の反応性のアミノ基を有する多官能性アミノ化合物を含む溶液を調製する工程と、
2以上の反応性の酸ハライド基を有する多官能性酸ハライド化合物を含む溶液を調製する工程とを行い、
前記分離膜の形成工程は、前記多官能性アミノ化合物と多官能性酸ハライド化合物とを界面重合させて前記スキン層としてのポリアミド層を形成する工程であることを特徴とするスパイラル型逆浸透膜エレメントの製造方法。 - 請求項6または7に記載のスパイラル型逆浸透膜エレメントの製造方法であって、
前記封止樹脂として、含浸の際の粘度が10〜40Pa・sの範囲内のものを使用することを特徴とするスパイラル型逆浸透膜エレメントの製造方法。 - 請求項6〜8の何れか1項に記載のスパイラル型逆浸透膜エレメントの製造方法であって、
前記封止樹脂の塗布量は0.2〜1g/cm 2 の範囲内であることを特徴とするスパイラル型逆浸透膜エレメントの製造方法。
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JP2004255779A JP4484635B2 (ja) | 2004-09-02 | 2004-09-02 | スパイラル型逆浸透膜エレメント、およびその製造方法 |
US11/216,051 US8608964B2 (en) | 2004-09-02 | 2005-09-01 | Spiral reverse osmosis membrane element, method of manufacturing the same, and its use method |
KR1020050081271A KR100809178B1 (ko) | 2004-09-02 | 2005-09-01 | 나선형 역삼투막 요소, 그의 제조 방법 및 그의 사용 방법 |
EP05019120.4A EP1637214B1 (en) | 2004-09-02 | 2005-09-02 | Spiral reverse osmosis membrane element and method of manufacturing the same |
ES05019120.4T ES2446920T3 (es) | 2004-09-02 | 2005-09-02 | Elemento de membrana de ósmosis en espiral y procedimiento de fabricación del mismo |
US12/173,694 US8591684B2 (en) | 2004-09-02 | 2008-07-15 | Spiral reverse osmosis membrane element, method of manufacturing the same, and its use method |
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KR20060050930A (ko) | 2006-05-19 |
ES2446920T3 (es) | 2014-03-10 |
KR100809178B1 (ko) | 2008-02-29 |
EP1637214B1 (en) | 2013-12-25 |
US20080295951A1 (en) | 2008-12-04 |
EP1637214A1 (en) | 2006-03-22 |
US20060043013A1 (en) | 2006-03-02 |
US8591684B2 (en) | 2013-11-26 |
US8608964B2 (en) | 2013-12-17 |
JP2006068644A (ja) | 2006-03-16 |
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