JPH08173772A - Hollow fiber membrane module - Google Patents
Hollow fiber membrane moduleInfo
- Publication number
- JPH08173772A JPH08173772A JP32257494A JP32257494A JPH08173772A JP H08173772 A JPH08173772 A JP H08173772A JP 32257494 A JP32257494 A JP 32257494A JP 32257494 A JP32257494 A JP 32257494A JP H08173772 A JPH08173772 A JP H08173772A
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- membrane
- fiber membrane
- membranes
- bundle
- 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.)
- Pending
Links
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、中空糸膜モジュールを
用いて水の浄化および分離を行う際に、被処理水中に混
在する気体、あるいは、断水等の事故に伴って逆流混入
した空気等の気体がモジュール内に蓄積されることに起
因する透水性能の低下ないしは停止のない改善された中
空糸膜モジュールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas mixed in water to be treated when purifying and separating water by using a hollow fiber membrane module, or air mixed backward due to an accident such as water interruption. The present invention relates to an improved hollow fiber membrane module in which the water permeation performance is not deteriorated or stopped due to the accumulation of the gas in the module.
【０００２】[0002]
【従来の技術】自然環境の悪化に伴う水質汚染が進み、
上水（飲料水）のカビ臭、トリハロメタン等の有害物質
を取り除き、おいしい安全な飲料水を提供する手段とし
て中空糸膜を用いた浄水器（清水器）が実用化されてい
る。2. Description of the Related Art As water pollution progresses with the deterioration of the natural environment,
BACKGROUND ART A water purifier (fresh water purifier) using a hollow fiber membrane has been put into practical use as a means for removing harmful substances such as mold odor and trihalomethane of drinking water (drinking water) and providing delicious safe drinking water.
【０００３】このような中空糸膜を用いた浄水器は、供
給される水中の気泡や断水時に空気が逆流するなどの原
因から浄水器のモジュール内に気体が入り込み、再度給
水しても浄化水が流出しないか、あるいは流出速度が著
しく低下する、いわゆるエアーブロッキング現象の問題
があった。In a water purifier using such a hollow fiber membrane, gas enters the module of the water purifier due to air bubbles in the supplied water or backflow of air at the time of water interruption, and even if water is supplied again, purified water is supplied. However, there is a problem of so-called air blocking phenomenon in which the air does not flow out or the outflow speed is significantly reduced.
【０００４】この対策方法として、浄水器内のモジュー
ルケースの空気滞留部分に空気抜き用バルブまたはベン
ト孔を設け、該バルブを操作して空気を抜くことが提案
されている（特開昭５８−１３３８８３号公報）。As a countermeasure against this, it has been proposed to provide an air bleeding valve or a vent hole in the air retention portion of the module case in the water purifier and operate the valve to bleed air (Japanese Patent Laid-Open No. 58-133883). Issue).
【０００５】[0005]
【発明が解決しようとする課題】上記の空気抜き用バル
ブあるいはベント孔を設ける方法は、浄水器自体の基本
的設計が複雑化すること、本体が大きくなること、コス
トアップにつながるなどのほかに、頻繁にバルブを操作
して空気を抜かねばならず、誤った操作をするとそれ以
降はエアーブロッキングによる流出不能ないしは流量の
低減に至ってしまうという不便さがあった。The above-described method of providing the air vent valve or vent hole complicates the basic design of the water purifier itself, increases the size of the main body, and leads to cost increase. It has been inconvenient that the valve has to be frequently operated to bleed air, and if an incorrect operation is performed, the air cannot be blocked or the flow rate is reduced thereafter.
【０００６】したがって、本発明の目的は、モジュール
内に空気が溜まっても水の濾過を妨げることなく直ちに
空気溜まりを自動的に系外に排出することができる中空
糸膜モジュールを提供することにある。[0006] Therefore, an object of the present invention is to provide a hollow fiber membrane module capable of automatically discharging the air pool out of the system immediately without hindering the filtration of water even if the air pools in the module. is there.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記目的
を達成するために中空糸膜モジュールを多数試作し、モ
ジュール内へ流入した空気溜まりを排出する方法を種々
試みた結果、本発明に到達したものである。In order to achieve the above-mentioned object, the inventors of the present invention made a large number of hollow fiber membrane modules as prototypes, and as a result of various trials of a method of discharging an air pool flowing into the module, the present invention was achieved. Has reached.
【０００８】即ち、本発明は、疎水性微多孔性平膜同士
をその間に中空糸膜の長手方向に空気流通可能な間隙を
保持した状態で重ね合わせた複層膜と多数の中空糸膜と
よりなる中空糸膜束であって、該複層膜が該中空糸膜の
長手方向に平行に中空糸膜と共に束ねられて中空糸膜の
長手方向から見たときに渦巻き状を形成するように配置
されており、該中空糸膜束のポッティング部の切断開口
端側に該疎水性微多孔性平膜の断面が開口してなる中空
糸膜モジュールである。That is, according to the present invention, a multi-layer membrane and a large number of hollow fiber membranes are formed by superposing hydrophobic microporous flat membranes in a state in which a space through which air can flow in the longitudinal direction of the hollow fiber membranes is held therebetween. A hollow fiber membrane bundle consisting of the multi-layer membrane, which is bundled together with the hollow fiber membrane in parallel with the longitudinal direction of the hollow fiber membrane so as to form a spiral shape when viewed from the longitudinal direction of the hollow fiber membrane. A hollow fiber membrane module that is arranged and has a cross section of the hydrophobic microporous flat membrane opened at the cutting opening end side of the potting portion of the hollow fiber membrane bundle.
【０００９】本発明に用いる中空糸膜としては、泥、ゴ
ミ、鉄サビ、有機微生物、大腸菌、一般細菌、コロイド
状不純物などを阻止できるものである。このためには、
通常、最大細孔径が１μｍ以下であり、平均孔径が０．
０１〜０．１μｍのものが好適に用いられる。また、中
空糸膜の外径は１０００μｍ以下であることが好まし
く、さらに３００〜５００μｍであることが好ましい。
膜厚は１５０μｍ以下であることが好ましく、さらに５
０〜１００μｍであることが好ましい。The hollow fiber membrane used in the present invention can prevent mud, dust, iron rust, organic microorganisms, Escherichia coli, general bacteria, colloidal impurities and the like. To do this,
Usually, the maximum pore size is 1 μm or less, and the average pore size is 0.
Those having a diameter of 01 to 0.1 μm are preferably used. The outer diameter of the hollow fiber membrane is preferably 1000 μm or less, more preferably 300 to 500 μm.
The film thickness is preferably 150 μm or less, and further 5
It is preferably 0 to 100 μm.
【００１０】中空糸膜の素材としては特に限定されるも
のではなく、ポリオレフィン系、ポリサルホン系、セル
ロース系等を用いることができる。中でもポリオレフィ
ン系は透水性能はもとより、膜の強度的性質、耐薬品性
等に優れているために好ましく用いられる。中空糸膜は
通常５００〜２０００本が束ねられて中空糸膜束を形成
する。The material of the hollow fiber membrane is not particularly limited, and polyolefin type, polysulfone type, cellulose type and the like can be used. Among them, polyolefin-based materials are preferably used because they are excellent not only in water permeability but also in strength properties, chemical resistance, etc. of the membrane. Usually, 500 to 2000 hollow fiber membranes are bundled to form a hollow fiber membrane bundle.
【００１１】本発明においては、中空糸膜束を中空糸膜
の長手方向からみたときに中空糸膜の偏平束が渦巻きを
形成するように巻かれていることが好ましい。図３は、
本発明の中空糸膜モジュールを中空糸膜の長手方向のポ
ッティング部とは反対側から見た概略図である。このよ
うな中空糸膜の束ね方としては次の方法を好適に採用し
うる。まず、図４に示したように、平行に配した二本の
可動棒６が可動ハンドル７を回すことによってその間隔
の調整可能な装置を用い、二本の可動棒６の間に中空糸
膜を折り返して引っ掛けて中空糸膜の長手方向とそれに
直角の方向に広がる中空糸膜の偏平束５を作成する。こ
の中空糸膜の偏平束５を、中空糸膜の長手方向に平行な
一辺からのり巻きのようにして巻く。このような中空糸
膜束は、中空糸膜のケース内への充填を高密度で行うこ
とができ、モジュールの単位体積当たりの中空糸膜の表
面積を大きくすることができるため、透水量を大きくす
ることができる。In the present invention, it is preferable that the flat bundle of the hollow fiber membrane is wound so as to form a spiral when the hollow fiber membrane bundle is viewed from the longitudinal direction of the hollow fiber membrane. FIG.
It is the schematic which looked at the hollow fiber membrane module of this invention from the opposite side to the potting part of the longitudinal direction of a hollow fiber membrane. As a method of bundling such hollow fiber membranes, the following method can be preferably adopted. First, as shown in FIG. 4, a device in which two movable rods 6 arranged in parallel can adjust the distance between them by turning a movable handle 7, and a hollow fiber membrane is provided between the two movable rods 6. Is folded back and hooked to form a flat bundle 5 of hollow fiber membranes which spreads in the longitudinal direction of the hollow fiber membranes and in the direction perpendicular thereto. The flat bundle 5 of the hollow fiber membrane is wound like a roll from one side parallel to the longitudinal direction of the hollow fiber membrane. In such a hollow fiber membrane bundle, the hollow fiber membranes can be packed into the case at a high density, and the surface area of the hollow fiber membranes per unit volume of the module can be increased. can do.
【００１２】一方、本発明において使用される複層膜
は、中空糸膜の長手方向に平行に中空糸膜と共に束ねら
れて中空糸膜の長手方向から見たときに渦巻き状を形成
するように配置されている。図１および図２は、本発明
の中空糸膜モジュールの代表的な態様を示す斜視図およ
び部分破断斜視図である。ここで、複層膜３は中空糸膜
２の長手方向に平行に中空糸膜２と共に束ねられてお
り、中空糸膜の長手方向から見たときに渦巻き状を形成
するように配置されている。On the other hand, the multi-layer membrane used in the present invention is bundled together with the hollow fiber membrane in parallel with the longitudinal direction of the hollow fiber membrane so as to form a spiral shape when viewed from the longitudinal direction of the hollow fiber membrane. It is arranged. 1 and 2 are a perspective view and a partially cutaway perspective view showing a typical embodiment of the hollow fiber membrane module of the present invention. Here, the multi-layer membrane 3 is bundled together with the hollow fiber membranes 2 in parallel to the longitudinal direction of the hollow fiber membranes 2, and is arranged so as to form a spiral shape when viewed from the longitudinal direction of the hollow fiber membranes. .
【００１３】ここで使用される複層膜は、疎水性微多孔
性平膜同士をその間に中空糸膜の長手方向に空気流通可
能な間隙を保持した状態で重ね合わせたものである。複
層膜は、水のみならず各種のコロイド状不純物も透過さ
せず空気を通過させ、モジュール内の処理水を漏洩する
ことなく滞留した空気をモジュール外に排出する機能を
有する。即ち、複層膜はモジュール内において、中空糸
膜と共に束ねられており、中空糸膜束のポッティング部
の切断開口端側にその断面が開口している。したがっ
て、モジュール内に滞留した空気は、複層膜を構成する
疎水性微多孔性平膜の表面の微細孔から膜内に入って膜
を透過した後、疎水性微多孔性平膜同士を重ね合わせて
形成される空気流通可能な間隙を通過してポッティング
部の切断開口端側に開口した複層膜の断面からモジュー
ル外に排出される。The multi-layer membrane used here is a stack of hydrophobic microporous flat membranes with a space between them which allows air to flow in the longitudinal direction of the hollow fiber membrane. The multilayer film has a function of passing not only water but also various colloidal impurities and allowing air to pass therethrough, and discharging the accumulated air to the outside of the module without leaking the treated water in the module. That is, the multi-layer membrane is bundled together with the hollow fiber membrane in the module, and its cross section is open to the cutting opening end side of the potting portion of the hollow fiber membrane bundle. Therefore, the air staying in the module enters the membrane through the fine pores on the surface of the hydrophobic microporous flat membrane that constitutes the multilayer membrane, permeates through the membrane, and then the hydrophobic microporous flat membranes are superposed on each other. It passes through the air-flowable gap formed together and is discharged to the outside of the module from the cross section of the multilayer film opened on the cutting opening end side of the potting portion.
【００１４】疎水性微多孔性平膜を一枚で使用したとき
は、モジュール内に滞留した空気は疎水性微多孔性平膜
の表面の微細孔から膜内に入り、膜平面に平行に膜内を
通過し、ポッティング部の切断開口端側に開口した膜の
断面からモジュール外に排出される。しかし、疎水性微
多孔性平膜は、一般に一方の面から他方の面への空気透
過性には優れているが、平膜表面に平行な方向に平膜内
部を透過するときの空気透過性は小さい。このため、モ
ジュール内に滞留した空気は短時間で系外に排出されな
いという問題がある。When a single sheet of hydrophobic microporous flat membrane is used, the air retained in the module enters the membrane through the fine pores on the surface of the hydrophobic microporous flat membrane and is parallel to the plane of the membrane. After passing through the inside, it is discharged out of the module from the cross section of the membrane opened on the cutting opening end side of the potting portion. However, the hydrophobic microporous flat membrane is generally excellent in air permeability from one surface to the other surface, but the air permeability when permeating inside the flat membrane in a direction parallel to the flat membrane surface. Is small. Therefore, there is a problem that the air staying in the module is not discharged out of the system in a short time.
【００１５】しかし、本発明においては、疎水性微多孔
性平膜同士をその間に中空糸膜の長手方向に空気流通可
能な間隙を保持した状態で重ね合わせた複層膜が使用さ
れる。空気は平膜を重ねることによって形成される空気
流通可能な間隙を通過する方が、平膜表面に平行な方向
に平膜内部を透過するよりも通りやすい。このため、モ
ジュール内に滞留した空気は短時間で系外に排出され
る。However, in the present invention, a multi-layer membrane is used in which hydrophobic microporous flat membranes are superposed on each other while holding a gap between them which allows air to flow in the longitudinal direction of the hollow fiber membrane. It is easier for air to pass through an air flowable gap formed by stacking flat membranes than to pass through the inside of the flat membranes in a direction parallel to the surface of the flat membranes. Therefore, the air accumulated in the module is discharged out of the system in a short time.
【００１６】疎水性微多孔性平膜は、このような機能を
有するものであれば公知のものを何等制限されることな
く使用することができる。一般には、上記した機能を発
揮させるために最大細孔径が１μｍ〜５μｍ、平均孔径
が０．２μｍ〜２．０μｍ、平面間の空気透過性１０〜
１００秒／１００ｃｃであるものを好適に使用できる。
疎水性微多孔性平膜の材質は特に制限されないが、疎水
性微多孔性平膜を被処理水が透過することによる漏洩を
防止するためには疎水性の材質でなければならない。し
たがって、かかる疎水性微多孔性平膜の材質はポリエチ
レン、ポリプロピレン、ポリテトラフルオロエチレンな
どの疎水性の高分子材料が好適に用いられる。もちろ
ん、親水性材料を用いることもできるが、その場合には
予め疎水化処理が必要となる。As the hydrophobic microporous flat membrane, known ones can be used without any limitation as long as they have such a function. Generally, the maximum pore size is 1 μm to 5 μm, the average pore size is 0.2 μm to 2.0 μm, and the air permeability between planes is 10 to achieve the above functions.
Those having 100 seconds / 100 cc can be preferably used.
The material of the hydrophobic microporous flat membrane is not particularly limited, but it must be a hydrophobic material in order to prevent leakage of water to be treated through the hydrophobic microporous flat membrane. Therefore, a hydrophobic polymer material such as polyethylene, polypropylene or polytetrafluoroethylene is preferably used as the material of the hydrophobic microporous flat membrane. Of course, a hydrophilic material can be used, but in that case, a hydrophobic treatment is required in advance.
【００１７】以上のような疎水性微多孔性平膜として
は、特公昭６０−２６６０号公報に記載されたような、
膜厚５０〜５００μｍのポリプロピレン製の平膜を特に
好適に用いることができる。The hydrophobic microporous flat membrane as described above is described in Japanese Patent Publication No. 60-2660.
A flat polypropylene film having a film thickness of 50 to 500 μm can be particularly preferably used.
【００１８】本発明における複層膜は、疎水性微多孔性
平膜を単に重ね合わせるだけでもよいが、作業性を向上
させるために疎水性微多孔性平膜同士を部分的に接合す
る方法を採用することが好ましい。部分的に接合する方
法は特に制限されず、例えば、熱融着、接着剤による接
着等の公知の方法を採用することができる。また、平膜
同士をその間に中空糸膜の長手方向に空気流通可能な間
隙を保持した状態とするためには、疎水性微多孔性平膜
を二層以上積層し、これらを点接合する方法、接合部分
が中空糸膜の長手方向に平行に走るように部分的に接合
する方法、疎水性微多孔性平膜の周囲のみを接合する方
法等を挙げることができる。The multilayer membrane in the present invention may be formed by simply superposing hydrophobic microporous flat membranes, but in order to improve workability, a method of partially joining the hydrophobic microporous flat membranes is used. It is preferable to adopt. The method of partially joining is not particularly limited, and for example, a known method such as heat fusion or adhesion with an adhesive can be adopted. Further, in order to keep the flat membranes in a state in which a space through which air can flow in the longitudinal direction of the hollow fiber membrane is held, two or more layers of hydrophobic microporous flat membranes are laminated, and these are point-joined. Examples of the method include a method of partially bonding so that the bonding portion runs parallel to the longitudinal direction of the hollow fiber membrane, and a method of bonding only the periphery of the hydrophobic microporous flat membrane.
【００１９】複層膜は、両表面層が疎水性微多孔性平膜
で構成されていればよい。複層膜の具体的な構成として
は、例えば、疎水性微多孔性平膜を二枚重ね合わせた構
造、両表面層を疎水性微多孔性平膜として内部層を無孔
平膜にした三層構造、両表面層を疎水性微多孔性平膜と
して内部層を有孔平膜にした三層構造等を挙げることが
できる。ここで、無孔平膜および有孔平膜の材質は特に
制限されず、前記した疎水性微多孔性平膜と同様のもの
を使用することができる。無孔平膜としては平面間の空
気透過性を実質的に有しない一般のフィルムやシートを
挙げることができ、また、有孔平膜としては、直径０．
１〜５ｍｍ程度の比較的大きな孔を穿孔されたフィルム
やシート、さらには、割布等を挙げることができる。In the multi-layer film, both surface layers may be composed of a hydrophobic microporous flat film. The specific structure of the multi-layer membrane is, for example, a structure in which two hydrophobic microporous flat membranes are stacked, a three-layer structure in which both surface layers are hydrophobic microporous flat membranes and the inner layer is a non-porous flat membrane. A three-layer structure in which both surface layers are hydrophobic microporous flat membranes and inner layers are porous flat membranes can be mentioned. Here, the material of the non-porous flat film and the porous flat film is not particularly limited, and the same material as the above-mentioned hydrophobic microporous flat film can be used. The non-porous flat membrane may be a general film or sheet having substantially no air permeability between planes, and the perforated flat membrane may have a diameter of 0.
Examples thereof include films and sheets having relatively large holes of about 1 to 5 mm, and split cloth.
【００２０】これら疎水性微多孔性平膜、無孔平膜また
は有孔平膜によって形成される空気流通可能な間隙は、
空気が流通可能な幅であれば目視で確認できなくても良
く、また、目視できる程度に大きな間隙が形成されてい
ても良い。The air-permeable gap formed by these hydrophobic microporous flat membranes, non-porous flat membranes or perforated flat membranes is
It may not be visually confirmed as long as the air can flow, and a large gap may be formed so that it can be visually observed.
【００２１】複層膜の膜厚は、あまり薄いと膜の腰が弱
く作業性に劣り、あまりに厚いとケース内の中空糸膜束
の占める所定の容積スペースを狭めることになるため
に、通常は１００μｍ〜１０００μｍが好ましい。When the thickness of the multi-layer membrane is too thin, the workability of the membrane is weak and the workability is poor, and when it is too thick, the predetermined volume space occupied by the hollow fiber membrane bundle in the case is narrowed. 100 μm to 1000 μm is preferable.
【００２２】上記した複層膜は、その両面の表面積が中
空糸膜の有効面積に対して１〜２０％、好ましくは５〜
１５％になるように調節されることが好ましい。通常は
中空糸膜の表面積は０．１５〜３．０ｍ2程度であり、
複層膜の両面の表面積を０．００１５〜０．６ｍ2とす
ることが好ましい。The surface area of both surfaces of the above-mentioned multi-layer membrane is 1 to 20%, preferably 5 to the effective area of the hollow fiber membrane.
It is preferably adjusted to be 15%. Usually, the surface area of the hollow fiber membrane is about 0.15 to 3.0 m 2 ,
The surface area of both surfaces of the multilayer film is preferably 0.0015 to 0.6 m 2 .
【００２３】また、中空糸膜束のポッティング部の切断
開口端に渦巻き状に開口した複層膜の長さは、あまりに
短いと空気の排出に時間がかかりすぎ、また、あまりに
長いと、中空糸膜束の占める所定の容積スペースを狭め
ることになるため、通常は、中空糸膜束の側面外周の長
さの１〜３倍の範囲、さらに１．２〜２．５倍の範囲で
あることが好ましい。Further, if the length of the multilayer membrane spirally opened at the cutting opening end of the potting portion of the hollow fiber membrane bundle is too short, it takes too much time to discharge air, and if it is too long, the hollow fiber is too long. Since the predetermined volume space occupied by the membrane bundle is narrowed, it is usually in the range of 1 to 3 times, further 1.2 to 2.5 times, the length of the outer circumference of the side surface of the hollow fiber membrane bundle. Is preferred.
【００２４】上記の複層膜の中空糸膜長手方向の長さは
特に限定されるものではなく、中空糸膜の長さの１／２
以上もあれば十分であり、また、ケースの長さまでの範
囲で適宜選択できる。The length of the multi-layer membrane in the longitudinal direction of the hollow fiber membrane is not particularly limited, and is 1/2 the length of the hollow fiber membrane.
The above is sufficient, and can be appropriately selected within the range up to the length of the case.
【００２５】複層膜のモジュール内の端部は、モジュー
ル内の被処理水のモジュール外への漏洩を防ぐために、
熱融着、接着剤等の方法で閉塞されている。In order to prevent the treated water in the module from leaking out of the module,
It is closed by a method such as heat fusion or an adhesive.
【００２６】次に本発明の中空糸膜モジュールを図面に
て説明する。図１および図２は、それぞれ本発明の中空
糸膜モジュールの代表的な態様を示す斜視図および部分
破断斜視図である。中空糸膜モジュールは、ケース１の
内部に中空糸膜の偏平束と複層膜３とが束ねられた中空
糸膜束２を挿入し、その一端を接着剤４で固定したもの
である。接着剤で固定された部分は一般にポッティング
部と呼ばれている。Next, the hollow fiber membrane module of the present invention will be described with reference to the drawings. 1 and 2 are a perspective view and a partially cutaway perspective view showing a typical embodiment of the hollow fiber membrane module of the present invention. In the hollow fiber membrane module, a hollow fiber membrane bundle 2 in which a flat bundle of hollow fiber membranes and a multilayer membrane 3 are bundled is inserted into a case 1, and one end thereof is fixed with an adhesive 4. A portion fixed with an adhesive is generally called a potting portion.
【００２７】複層膜３は、疎水性微多孔性平膜同士を重
ね、熱融着等の方法で中空糸膜の長手方向に平行に一定
幅のヒートシール部が一定間隔となるように接合したも
のであり、また、その端部は閉口状態にされている。こ
の複層膜は、上記中空糸膜の扁平束と共にのり巻きのよ
うに巻かれてケース内に収納され接着剤で固定後にポッ
ティング部が切断される。したがって、該複層膜は、ケ
ースの内部側は端面が閉口状態であり、ポッティング部
の切断面側は開口状態に保たれている。ポッティング部
の切断面では、上記複層膜と共に中空糸膜も開口してい
る。The multi-layer membrane 3 is formed by stacking hydrophobic microporous flat membranes on top of each other and joining them by a method such as heat fusion so that the heat-sealing portions having a constant width are parallel to the longitudinal direction of the hollow fiber membrane at regular intervals. In addition, its end is closed. The multi-layer membrane is wound together with the flat bundle of the hollow fiber membrane like a roll, housed in a case, fixed with an adhesive, and then the potting portion is cut. Therefore, in the multilayer film, the end surface is closed on the inner side of the case, and the cut surface side of the potting portion is kept open. On the cut surface of the potting portion, the hollow fiber membrane is opened together with the multilayer membrane.
【００２８】モジュール内に水を導入すると、水は中空
糸膜の外側から内側へ透過するが、水に混入した空気な
どの気体はモジュール内部に溜まる。この滞留した空気
は、中空糸膜束内に渦巻き状に配置された複層膜を構成
する疎水性微多孔性平膜の表面から膜内に入って膜を透
過した後、疎水性微多孔性平膜同士を重ね合わせること
によって形成される空気流通可能な間隙を通過してポッ
ティング部の切断開口端側に開口した複層膜の断面から
モジュール外に排出される。When water is introduced into the module, the water permeates from the outer side to the inner side of the hollow fiber membrane, but gas such as air mixed in the water accumulates inside the module. The accumulated air enters the membrane from the surface of the hydrophobic microporous flat membrane that constitutes the multilayer membrane spirally arranged in the hollow fiber membrane bundle, permeates through the membrane, and then the hydrophobic microporous membrane The flat membranes are passed through a gap in which air can flow and are discharged from the module from the cross section of the multilayer membrane opened on the cutting opening end side of the potting portion.
【００２９】[0029]
【発明の効果】以上のように、本発明の中空糸膜モジュ
ールは複層膜を中空糸膜と共に束ねて渦巻き状に配置す
ることによって、ケースの内部に溜まった空気等の気体
を直ちに自動的に外部へ排出することができ、従来問題
とされていたケース内へ空気が混入したときに生じる濾
過効率の低下等を解消することができる。さらに、疎水
性微多孔性平膜またはそれより構成された複層膜と中空
糸膜の面積比を常に一定に保持することができ、空気等
の気体の除去性能及び水の濾過性能に優れた中空糸膜モ
ジュールを提供できる。As described above, according to the hollow fiber membrane module of the present invention, the multi-layer membrane is bundled together with the hollow fiber membrane and arranged in a spiral shape, so that gas such as air accumulated inside the case is automatically automatically generated. Therefore, it is possible to eliminate a decrease in filtration efficiency that occurs when air is mixed into the case, which has been a problem in the past. Furthermore, the area ratio of the hydrophobic microporous flat membrane or the multi-layer membrane composed thereof and the hollow fiber membrane can be always kept constant, and the performance of removing gas such as air and the performance of filtering water are excellent. A hollow fiber membrane module can be provided.
【００３０】[0030]
【実施例】以下、本発明を実施例によりさらに具体的に
説明するが、本発明は、これら実施例により何ら限定さ
れるものではない。EXAMPLES The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００３１】なお、本発明において、中空糸膜、疎水性
微多孔性平膜および複層膜の物性は下記の方法により測
定した。In the present invention, the physical properties of the hollow fiber membrane, the hydrophobic microporous flat membrane and the multilayer membrane were measured by the following methods.
【００３２】（１）最大細孔径 ＡＳＴＭ Ｆ３１６ エタノールバブルポイント法によ
り測定した。(1) Maximum Pore Diameter Measured by ASTM F316 ethanol bubble point method.
【００３３】（２）空気透過性 ＪＩＳ Ｐ８１１７ ガーレ式により測定した。(2) Air permeability Measured by JIS P8117 Gurley method.
【００３４】実施例 外径４５０μｍ、内径３００μｍ、膜厚７５μｍ、最大
細孔径０．８μｍのポリプロピレン製中空糸膜を用い、
図４に示す方法で１０ｃｍの間隔で平行に配した二本の
棒の間を折り返して引っ掛け、中空糸膜の長手方向（折
り返し部間の間隔）が１０ｃｍ、それに直角方向が２５
ｃｍの１０００本の中空糸膜の偏平束を作成した。Example A polypropylene hollow fiber membrane having an outer diameter of 450 μm, an inner diameter of 300 μm, a film thickness of 75 μm, and a maximum pore diameter of 0.8 μm was used.
In the method shown in Fig. 4, two rods arranged in parallel at intervals of 10 cm were folded back and hooked, and the longitudinal direction of the hollow fiber membrane (interval between folded portions) was 10 cm, and the direction perpendicular thereto was 25 cm.
A flat bundle of 1000 hollow fiber membranes of 1000 cm was prepared.
【００３５】一方、疎水性微多孔性平膜として、最大細
孔径２．５μｍ、平面間の空気透過性が４０秒／１００
ｃｃ、膜厚１２０μｍであるＮＦシート（商品名、
（株）トクヤマ製）を１５ｃｍ（中空糸膜束のポッティ
ング部の切断開口端に渦巻き状に開口した複層膜の長さ
に相当する。）×１０ｃｍ（中空糸膜の長手方向とな
る。）の大きさに切断し、これを二枚重ね、ヒートシー
ラーで中空糸膜の長手方向に平行に２ｍｍ幅のヒートシ
ール部が７ｍｍ間隔となるようにヒートシールし、複層
膜を作成した。さらに、複層膜の端部をヒートシールし
た。この複層膜の厚みは２４０〜５００μｍであった。On the other hand, the hydrophobic microporous flat membrane has a maximum pore diameter of 2.5 μm and an air permeability between planes of 40 seconds / 100.
cc sheet with a film thickness of 120 μm (trade name,
15 cm (made by Tokuyama Corp.) (corresponding to the length of the multilayer membrane spirally opened at the cutting opening end of the potting portion of the hollow fiber membrane bundle) × 10 cm (in the longitudinal direction of the hollow fiber membrane). Was cut into two pieces, and two sheets were stacked and heat-sealed in parallel with the longitudinal direction of the hollow fiber membrane so that the heat-sealed portions having a width of 2 mm were spaced by 7 mm to form a multi-layer membrane. Further, the end of the multilayer film was heat-sealed. The thickness of this multilayer film was 240 to 500 μm.
【００３６】次に、上記の中空糸膜の長手方向が１０ｃ
ｍ、それに直角方向が２５ｃｍの中空糸膜の偏平束の上
に複層膜を重ねて中空糸膜の長手方向に平行な一辺から
のり巻きのようにして巻き、中空糸膜の扁平束と複層膜
が中空糸膜の長手方向から見たときに渦巻き状を形成し
た中空糸膜束（側面の外周１０ｃｍ）を作成した。これ
をケース内に収納した。その後、一端をポリウレタン接
着剤でポッティングし、モジュールカッターで中空糸膜
束のポッティング部を切断し、浄水器用の中空糸膜モジ
ュールを得た。中空糸膜の有効膜面積は０．２５ｍ2で
あり、複層膜の有効膜面積は０．０２ｍ2であった。Next, the longitudinal direction of the hollow fiber membrane is 10c.
m, the orthogonal direction is 25 cm, and the multi-layer membrane is stacked on a flat bundle of hollow fiber membranes and wound like a tape from one side parallel to the longitudinal direction of the hollow fiber membranes to form a flat bundle of hollow fiber membranes. A hollow fiber membrane bundle (outer circumference of the side surface 10 cm) was formed in which the layer membrane formed a spiral shape when viewed from the longitudinal direction of the hollow fiber membrane. This was stored in the case. Then, one end was potted with a polyurethane adhesive, and the potting portion of the hollow fiber membrane bundle was cut with a module cutter to obtain a hollow fiber membrane module for a water purifier. The effective membrane area of the hollow fiber membrane was 0.25 m 2 , and the effective membrane area of the multi-layer membrane was 0.02 m 2 .
【００３７】上記の中空糸膜モジュールのポッティング
部が上向きとなるように中空糸膜モジュールを固定し、
下部から水圧１ｋｇ／ｃｍ2の上水を供給すると、透水
量は約２０Ｌ／分であった。次いで、中空糸膜モジュー
ルの下部から約５００ｃｃの空気を注入し、再度給水し
たところ約７秒間で空気は複層膜から中空糸膜モジュー
ル系外へ排出されて再び約２０Ｌ／分の透水量が回復し
た。Fix the hollow fiber membrane module so that the potting portion of the hollow fiber membrane module faces upward,
When water pressure of 1 kg / cm 2 was supplied from the bottom, the water permeation rate was about 20 L / min. Then, about 500 cc of air was injected from the lower part of the hollow fiber membrane module, and water was supplied again, and in about 7 seconds, the air was discharged from the multilayer membrane to the outside of the hollow fiber membrane module system, and the water permeation rate of about 20 L / min was again obtained. Recovered.
【００３８】比較例 複層膜を中空糸膜束の内部に配置せず、中空糸膜束の側
面外周を包囲させたこと以外は実施例と全く同様にして
中空糸膜モジュールを作成した。この中空糸膜モジュー
ルを用いて実施例と同様に試験を行ったところ、透水量
が２０Ｌ／分に回復するまでに２０秒を要した。Comparative Example A hollow fiber membrane module was prepared in exactly the same manner as in the Example except that the multilayer membrane was not placed inside the hollow fiber membrane bundle but the side surface outer circumference of the hollow fiber membrane bundle was surrounded. When a test was conducted using this hollow fiber membrane module in the same manner as in the example, it took 20 seconds for the water permeation rate to recover to 20 L / min.
【図１】 図１は、本発明の中空糸膜モジュールの代表
的な態様を示す斜視図である。FIG. 1 is a perspective view showing a typical embodiment of a hollow fiber membrane module of the present invention.
【図２】 図２は、本発明の中空糸膜モジュールの代表
的な態様を示す部分破断斜視図である。FIG. 2 is a partially cutaway perspective view showing a typical embodiment of the hollow fiber membrane module of the present invention.
【図３】 図３は、本発明の中空糸膜モジュールを中空
糸膜の長手方向のポッティング部とは反対側から見た概
略図である。FIG. 3 is a schematic view of the hollow fiber membrane module of the present invention viewed from the side opposite to the potting portion in the longitudinal direction of the hollow fiber membrane.
【図４】 図４は、本発明における中空糸膜の偏平束の
製造方法を示す概略図である。FIG. 4 is a schematic view showing a method for producing a flat bundle of hollow fiber membranes according to the present invention.
１：中空糸膜モジュールのケース ２：中空糸膜 ３：複層膜 ４：接着剤 ５：中空糸膜の扁平束 ６：可動棒 ７：可動ハンドル 1: Case of hollow fiber membrane module 2: Hollow fiber membrane 3: Multilayer membrane 4: Adhesive 5: Flat bundle of hollow fiber membranes 6: Movable rod 7: Movable handle
Claims (1)
膜の長手方向に空気流通可能な間隙を保持した状態で重
ね合わせた複層膜と多数の中空糸膜とよりなる中空糸膜
束であって、該複層膜が該中空糸膜の長手方向に平行に
中空糸膜と共に束ねられて中空糸膜の長手方向から見た
ときに渦巻き状を形成するように配置されており、該中
空糸膜束のポッティング部の切断開口端側に該疎水性微
多孔性平膜の断面が開口してなる中空糸膜モジュール。1. A hollow fiber comprising a multi-layered membrane and a large number of hollow fiber membranes, wherein hydrophobic microporous flat membranes are superposed on each other with a space between the hollow microfiber membranes in the longitudinal direction of the hollow fiber membrane to allow air flow. A membrane bundle, wherein the multi-layer membrane is bundled in parallel with the longitudinal direction of the hollow fiber membrane together with the hollow fiber membrane so as to form a spiral when viewed from the longitudinal direction of the hollow fiber membrane. A hollow fiber membrane module in which the cross section of the hydrophobic microporous flat membrane is open at the cutting opening end side of the potting portion of the hollow fiber membrane bundle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32257494A JPH08173772A (en) | 1994-12-26 | 1994-12-26 | Hollow fiber membrane module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32257494A JPH08173772A (en) | 1994-12-26 | 1994-12-26 | Hollow fiber membrane module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08173772A true JPH08173772A (en) | 1996-07-09 |
Family
ID=18145210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32257494A Pending JPH08173772A (en) | 1994-12-26 | 1994-12-26 | Hollow fiber membrane module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08173772A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030029373A (en) * | 2001-10-08 | 2003-04-14 | 주식회사 새 한 | Method for manufacturing a cylinder-shaped cartridge filter |
| CN114632423A (en) * | 2022-04-06 | 2022-06-17 | 创脉医疗科技(上海)有限公司 | Membrane module system, gas exchange and desorption system and blood oxygenator |
-
1994
- 1994-12-26 JP JP32257494A patent/JPH08173772A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030029373A (en) * | 2001-10-08 | 2003-04-14 | 주식회사 새 한 | Method for manufacturing a cylinder-shaped cartridge filter |
| CN114632423A (en) * | 2022-04-06 | 2022-06-17 | 创脉医疗科技(上海)有限公司 | Membrane module system, gas exchange and desorption system and blood oxygenator |
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