JPH048090B2 - - Google Patents
Info
- Publication number
- JPH048090B2 JPH048090B2 JP15138882A JP15138882A JPH048090B2 JP H048090 B2 JPH048090 B2 JP H048090B2 JP 15138882 A JP15138882 A JP 15138882A JP 15138882 A JP15138882 A JP 15138882A JP H048090 B2 JPH048090 B2 JP H048090B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- fiber membrane
- permselective hollow
- membrane
- modifying
- 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.)
- Expired
Links
- 239000012528 membrane Substances 0.000 claims description 41
- 239000012510 hollow fiber Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 150000004820 halides Chemical class 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229910001508 alkali metal halide Inorganic materials 0.000 claims description 5
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 14
- 238000000926 separation method Methods 0.000 description 14
- 230000035699 permeability Effects 0.000 description 11
- 150000003839 salts Chemical class 0.000 description 11
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Chemical compound [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- HYYVCACCUFXMMU-UHFFFAOYSA-N 3-(7-azabicyclo[4.1.0]hepta-1,3,5-triene-7-carbonyl)benzamide Chemical compound NC(=O)C1=CC=CC(C(=O)N2C3=CC=CC=C32)=C1 HYYVCACCUFXMMU-UHFFFAOYSA-N 0.000 description 1
- WPBZMCGPFHZRHJ-UHFFFAOYSA-N 4-aminobenzohydrazide Chemical compound NNC(=O)C1=CC=C(N)C=C1 WPBZMCGPFHZRHJ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920001007 Nylon 4 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920002164 Polyalkylene glycol copolymer Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- IKWQWOFXRCUIFT-UHFFFAOYSA-N benzene-1,2-dicarbohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C(=O)NN IKWQWOFXRCUIFT-UHFFFAOYSA-N 0.000 description 1
- 229910001640 calcium iodide Inorganic materials 0.000 description 1
- 229940046413 calcium iodide Drugs 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- BLQJIBCZHWBKSL-UHFFFAOYSA-L magnesium iodide Chemical compound [Mg+2].[I-].[I-] BLQJIBCZHWBKSL-UHFFFAOYSA-L 0.000 description 1
- 229910001641 magnesium iodide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001447 polyvinyl benzene Polymers 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Description
【発明の詳細な説明】
本発明は混合流体中の成分の分離、濃縮に用い
られる選択透過性中空繊維膜の流体透過性を下げ
ることなく、分離性能を向上させ、かつ膜の機械
的な強度ならびに、熱、圧力、高塩濃度に対する
耐久性を向上させる改質法に関するものである。
一般に流体の成分の分離及び濃縮は選択透過膜
を使用して気体分離、有機液体分離逆浸透法また
は限外過法によつて行われる。この際の流体の
分離速度は膜面積及び操作圧に比例するため、い
かにして膜面積を大きくし溶液効率を上げると同
時に膜に耐圧性を付与するかが課題であり、其の
解決方法として中空繊維膜が開発されたが、耐久
性においては十分な結果が得られていない。一
方、選択透過膜により流体中の成分の分離、また
は濃縮を能率的に行うには、膜が高い液体透過性
と分離性能を持つと同時に長期間に亙りこれら性
能が安定であることが要求される。一般に膜の流
体透過性を高くすれば分離性能及び耐圧性が低下
し、逆に分離性能及び耐圧性を高めようとすれば
流体透過性が低下する傾向があり、高度の流体透
過性と分離性能及び耐久性を共に付与することは
困難である。
本発明は、選択透過性中空繊維膜の流体透過性
の低下を最小にして分離性能を向上させ、同時に
膜に高圧、高温、高塩濃度に対する耐久性を付与
させる方法を提供するものである。
すなわち、本発明は選択透過性中空繊維膜をア
ルカリ及び／またはアルカリ土類金属のハロゲン
化物水溶液中でその含水率がハロゲン化物水溶液
浸漬前の含水率の50〜90％になるまで熱処理する
ことを特徴とする選択透過性中空繊維膜の改質法
である。
本発明に適用しうる選択透過性中空繊維膜とし
ては、例えば二酢酸セルロース、三酢酸セルロー
ス、またはこれらの混合物、もしくは誘導体、ポ
リヒドロキシエチル（メタ）アクリレート、又は
その共重合体、ポリアクリルニトリル、又はその
共重合体、ポリアクリル酸共重合体、ナイロン
４、ナイロン６、ナイロン66、ポリエチレンオキ
シドグラフトポリアミド共重合体、Ｐ−フエニレ
ンイソフタルアミドのようなポリアミド、Ｐ−ア
ミノ安息香酸ヒドラジツト、テレ（イソ）フタル
酸ジヒドラジツド、またはそれらの誘導体のよう
なポリヒドラジツド、ポリビニルアセタール、ポ
リエステル−ポリアルキレングリコール共重合
体、ポリスチレンスルホン酸−ポリビニルベンゼ
ントリメチルアンモニウムのような高分子電解質
を主として湿式紡糸法によつて中空繊維膜に成形
したものあるいは多孔質の中空繊維の表面に選択
透過性を有する活性層を被覆した複合中空繊維膜
が使用されるがこれら物質に限定されるものでは
ない。
上記選択透過性中空繊維膜をアルカリ金属及
び／またはアルカリ土類金属のハロゲン化水溶液
中で熱処理するが使用するハロゲン化物としては
沃化リチウム、沃化ナトリウム、塩化リチウム、
塩化ナトリウム、臭化ナトリウム等のアルカリ金
属のハロゲン化物、沃化マグネシウム、沃化カル
シウム、塩化マグネシウム、塩化カルシウム等の
アルカリ土類金属のハロゲン化物があるが、一般
的なものとしては塩化リチウム、塩化ナトリウ
ム、塩化カリウム、塩化マグネシウム、塩化カル
シウム等があげられる。
これらのハロゲン化物は好ましくは0.5〜20重
量％、更に好ましくは1.0〜10.0重量％水溶液と
して使用する。ハロゲン化物の濃度が極端に低い
と本発明の効果、すなわち、流体透過性を下げる
ことなく、分離能を向上させ、かつ膜の高温、高
塩濃度耐久性を向上させることができないし、
又、濃度が極端に高いと膜の脱水和が強く行われ
て膜のゲル構造が破壊されて脱水、吸水の可逆性
が失われ、膜の流体透過性が著しく低下する。
熱処理はアルカリ及び／又はアルカリ土類金属
のハロゲン化物水溶液中で行い、処理温度は50℃
〜100℃の範囲、好ましくは70％〜100℃である。
場合によつては、加圧によつて処理温度を100℃
以上に高めることもできる。又、処理時間に関し
ては膜素材或いはハロゲン化物によつて多少の相
違はあるが熱処理前の中空繊維膜の含水率の50％
〜90％減少するまで処理することが必要である。
本発明に供する選択透過性中空繊維膜は逆浸透
作用を有することが大切であり、3.5％食塩水溶
液、操作圧55Kg／cm2・Ｇの測定条件下で50％〜
99.8％以上の食塩の除去性能を有してなるもので
ある。除去能の低い中空繊維膜の使用では目標と
する分離性能が向上と圧力及び温度、高塩濃度に
対する耐久性が得られないばかりか、膜の流体透
過性が著るしく低下する。
本発明の処理を施こすことによつて、中空繊維
膜の流体透過速度を低下させることなく、分離性
能及び膜の温度、圧力に対する耐久性が向上し、
長期間安定した状態で使用できることから、流体
分離素子として極めて有利である。
本発明の処理を施こした中空繊維膜を組込んだ
流体分離素子は水中の各種、塩類、有機低分子化
合物の分離、濃縮に使用されて著るしい効果を発
揮するが、この用途に限定されるものではない。
以下、実施例について本発明を更に詳細に説明
する。
実施例及び比較例
三酢酸セルロースからなる選択透過性中空繊維
膜、（外径165μ、内径80μ、含水率55％、塩除去
率70％、透水量55／m2・Ｄ）を第１表のような
各種濃度の食塩水中で各種温度条件で20分間熱処
理を行い、得られた中空繊維膜を濃度3.5重量％
食塩水を用いて操作圧55Kg／cm2・Ｇ、温度25℃回
収率５％で性能を測定した結果、塩除去率、透水
性は第１表のようになりいづれも塩除去率及び耐
久性は向上した（実施例１〜３）。尚、中空繊維
膜の耐久性は2000HVS後の性能の変化を初期と
比較した。
また、単に熱水処理のみを施したもの、処理温
度の低いもの、食塩水濃度の低いものの結果を比
較例１〜３として掲げた。
塩除去率及び耐久性は実施例１〜３のものに比
較して悪かつた。
【表】Detailed Description of the Invention The present invention improves the separation performance of a permselective hollow fiber membrane used for separating and concentrating components in a mixed fluid without reducing the fluid permeability, and improves the mechanical strength of the membrane. It also relates to a modification method that improves durability against heat, pressure, and high salt concentrations. Generally, the separation and concentration of fluid components is carried out using a selectively permeable membrane for gas separation, organic liquid separation by reverse osmosis or ultrafiltration. The separation rate of the fluid in this case is proportional to the membrane area and operating pressure, so the challenge is how to increase the membrane area and increase the solution efficiency while at the same time imparting pressure resistance to the membrane. Hollow fiber membranes have been developed, but satisfactory results have not been achieved in terms of durability. On the other hand, in order to efficiently separate or concentrate components in a fluid using a selectively permeable membrane, it is required that the membrane has high liquid permeability and separation performance, and that these performances are stable over a long period of time. Ru. In general, if the fluid permeability of a membrane is increased, the separation performance and pressure resistance will decrease, and conversely, if you try to increase the separation performance and pressure resistance, the fluid permeability will tend to decrease. It is difficult to provide both durability and durability. The present invention provides a method for minimizing the decrease in fluid permeability of a permselective hollow fiber membrane, improving separation performance, and at the same time imparting durability to high pressure, high temperature, and high salt concentration to the membrane. That is, the present invention involves heat-treating a permselective hollow fiber membrane in an aqueous solution of an alkali and/or alkaline earth metal halide until its water content becomes 50 to 90% of the water content before immersion in the aqueous halide solution. This is a method for modifying permselective hollow fiber membranes. Examples of permselective hollow fiber membranes that can be applied to the present invention include cellulose diacetate, cellulose triacetate, or mixtures or derivatives thereof, polyhydroxyethyl (meth)acrylate or copolymers thereof, polyacrylonitrile, or copolymers thereof, polyacrylic acid copolymers, nylon 4, nylon 6, nylon 66, polyethylene oxide grafted polyamide copolymers, polyamides such as P-phenylene isophthalamide, P-aminobenzoic acid hydrazide, tele( Polyhydrazides such as iso)phthalic acid dihydrazide or their derivatives, polyelectrolytes such as polyvinyl acetal, polyester-polyalkylene glycol copolymers, polystyrene sulfonic acid-polyvinylbenzene trimethylammonium, etc., are mainly hollow-spun by wet spinning. A composite hollow fiber membrane formed into a fiber membrane or a composite hollow fiber membrane in which the surface of porous hollow fibers is coated with an active layer having selective permeability is used, but the material is not limited to these materials. The permselective hollow fiber membrane is heat-treated in an aqueous alkali metal and/or alkaline earth metal halide solution, and the halides used include lithium iodide, sodium iodide, lithium chloride,
There are halides of alkali metals such as sodium chloride and sodium bromide, halides of alkaline earth metals such as magnesium iodide, calcium iodide, magnesium chloride, and calcium chloride, but the common ones are lithium chloride and chloride. Examples include sodium, potassium chloride, magnesium chloride, and calcium chloride. These halides are preferably used as an aqueous solution of 0.5 to 20% by weight, more preferably 1.0 to 10.0% by weight. If the concentration of halide is extremely low, the effects of the present invention cannot be achieved, that is, the separation ability can be improved without reducing fluid permeability, and the durability of the membrane at high temperatures and high salt concentrations cannot be improved.
Furthermore, if the concentration is extremely high, the membrane will be strongly dehydrated, the gel structure of the membrane will be destroyed, the reversibility of dehydration and water absorption will be lost, and the fluid permeability of the membrane will be significantly reduced. Heat treatment is performed in an aqueous solution of alkali and/or alkaline earth metal halides, and the treatment temperature is 50°C.
-100°C, preferably 70% - 100°C.
In some cases, the treatment temperature may be increased to 100℃ by applying pressure.
It is also possible to increase it further. In addition, the treatment time varies slightly depending on the membrane material or halide, but the treatment time is 50% of the water content of the hollow fiber membrane before heat treatment.
It is necessary to treat until ~90% reduction. It is important that the permselective hollow fiber membrane used in the present invention has a reverse osmosis effect, and under the measurement conditions of a 3.5% saline solution and an operating pressure of 55 kg/cm 2 G, 50% to
It has a salt removal performance of 99.8% or more. The use of hollow fiber membranes with low removal capacity not only fails to achieve the desired improvement in separation performance and durability against pressure, temperature, and high salt concentrations, but also significantly reduces the fluid permeability of the membrane. By applying the treatment of the present invention, the separation performance and the membrane's durability against temperature and pressure are improved without reducing the fluid permeation rate of the hollow fiber membrane.
Since it can be used in a stable state for a long period of time, it is extremely advantageous as a fluid separation element. Fluid separation elements incorporating hollow fiber membranes treated according to the present invention can be used to separate and concentrate various types of salts and organic low-molecular compounds in water, and exhibit remarkable effects, but are limited to this application. It is not something that will be done. Hereinafter, the present invention will be explained in more detail with reference to Examples. Examples and Comparative Examples A permselective hollow fiber membrane made of cellulose triacetate (outer diameter 165μ, inner diameter 80μ, water content 55%, salt removal rate 70%, water permeability 55/m 2 ·D) was used as shown in Table 1. Heat treatment was performed for 20 minutes at various temperature conditions in saline solution with various concentrations, and the resulting hollow fiber membrane was heated to a concentration of 3.5% by weight.
The performance was measured using salt water at an operating pressure of 55 kg/cm 2 G and a temperature of 25°C with a recovery rate of 5%. The salt removal rate and water permeability were as shown in Table 1. Both salt removal rate and durability were measured. was improved (Examples 1 to 3). Furthermore, regarding the durability of the hollow fiber membrane, the change in performance after 2000HVS was compared with the initial state. In addition, the results of those subjected to only hot water treatment, those treated at a low treatment temperature, and those treated with a low saline concentration are listed as Comparative Examples 1 to 3. The salt removal rate and durability were worse than those of Examples 1-3. 【table】
Claims (1)
アルカリ土類金属のハロゲン化物水溶液中で、そ
の含水率がハロゲン化物水溶液浸漬前の含水率の
50〜90％になるまで熱処理することを特徴とする
選択透過性中空繊維膜の改質法。 ２ アルカリ及び／又はアルカリ土類金属ハロゲ
ン化物の水溶液での濃度が0.5〜20.0重量％であ
る特許請求の範囲第１項記載の選択透過性中空繊
維膜の改質法。 ３ 熱処理温度が50〜100℃である特許請求の範
囲第１項記載の選択透過性中空繊維膜の改質法。 ４ 熱処理前の選択透過性中空繊維膜の除去性能
が3.5％Nacl水溶液、操作圧55Kg／cm2・Ｇ、回収
率５％以下の測定条件で50〜99.8％である特許請
求の範囲第１項記載の選択透過性中空繊維膜の改
質法。[Scope of Claims] 1. A permselective hollow fiber membrane is placed in an aqueous solution of an alkali and/or alkaline earth metal halide, and its water content is lower than the water content before immersion in the aqueous halide solution.
A method for modifying a permselective hollow fiber membrane, which is characterized by heat-treating the permselective hollow fiber membrane until it becomes 50 to 90%. 2. The method for modifying a permselective hollow fiber membrane according to claim 1, wherein the concentration of the alkali and/or alkaline earth metal halide in the aqueous solution is 0.5 to 20.0% by weight. 3. The method for modifying a permselective hollow fiber membrane according to claim 1, wherein the heat treatment temperature is 50 to 100°C. 4. Claim 1, wherein the removal performance of the permselective hollow fiber membrane before heat treatment is 50 to 99.8% under measurement conditions of 3.5% NaCl aqueous solution, operating pressure 55 Kg/cm 2 G, and recovery rate of 5% or less. The method for modifying the permselective hollow fiber membrane described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15138882A JPS5942008A (en) | 1982-08-31 | 1982-08-31 | Reforming method of permselective hollow fiber membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15138882A JPS5942008A (en) | 1982-08-31 | 1982-08-31 | Reforming method of permselective hollow fiber membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5942008A JPS5942008A (en) | 1984-03-08 |
| JPH048090B2 true JPH048090B2 (en) | 1992-02-14 |
Family
ID=15517488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15138882A Granted JPS5942008A (en) | 1982-08-31 | 1982-08-31 | Reforming method of permselective hollow fiber membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5942008A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4503117B2 (en) * | 1999-08-03 | 2010-07-14 | 旭化成ケミカルズ株式会社 | Hydrophilic porous membrane |
| JP4872800B2 (en) * | 2007-05-25 | 2012-02-08 | 東レ株式会社 | Method for treating composite semipermeable membrane and method for producing salt-treated composite semipermeable membrane |
| JP5418739B1 (en) * | 2012-02-09 | 2014-02-19 | 東洋紡株式会社 | Hollow fiber type semipermeable membrane, manufacturing method and module thereof, and water treatment method |
| DK2818228T3 (en) | 2012-02-24 | 2020-09-07 | Toyo Boseki | Hollow fiber type cellulose triacetate semipermeable membrane, process for the production of the same, modulus and water treatment process |
-
1982
- 1982-08-31 JP JP15138882A patent/JPS5942008A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5942008A (en) | 1984-03-08 |
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