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1. (WO2019049857) FILTRATION METHOD USING POROUS MEMBRANE
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Pub. No.: WO/2019/049857 International Application No.: PCT/JP2018/032736
Publication Date: 14.03.2019 International Filing Date: 04.09.2018
IPC:
C02F 1/44 (2006.01) ,B01D 65/06 (2006.01) ,B01D 69/00 (2006.01) ,B01D 69/08 (2006.01) ,B01D 71/34 (2006.01) ,C08J 9/26 (2006.01)
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
44
by dialysis, osmosis or reverse osmosis
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
65
Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
02
Membrane cleaning or sterilisation
06
with special washing compositions
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
08
Hollow fibre membranes
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
71
Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06
Organic material
30
Polyalkenyl halides
32
containing fluorine atoms
34
Polyvinylidene fluoride
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
26
by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
Applicants:
旭化成株式会社 ASAHI KASEI KABUSHIKI KAISHA [JP/JP]; 東京都千代田区有楽町一丁目1番2号 1-1-2, Yurakucho, Chiyoda-ku, Tokyo 1000006, JP
Inventors:
岡村 大祐 OKAMURA, Daisuke; JP
Agent:
青木 篤 AOKI, Atsushi; JP
三橋 真二 MITSUHASHI, Shinji; JP
中村 和広 NAKAMURA, Kazuhiro; JP
齋藤 都子 SAITO, Miyako; JP
三間 俊介 MIMA, Shunsuke; JP
Priority Data:
2017-17197207.09.2017JP
Title (EN) FILTRATION METHOD USING POROUS MEMBRANE
(FR) PROCÉDÉ DE FILTRATION UTILISANT UNE MEMBRANE POREUSE
(JA) 多孔質膜を用いたろ過方法
Abstract:
(EN) Provided is a filtration method that includes a cleaning step and involves the use of a porous membrane, wherein the filtration method offers exceptional resistance to cleaning solutions (chemicals) (chemical liquid resistance) and exceptional filtration performance, and has a long service life. A filtration method comprising the following steps: a filtration step in which a liquid to be processed that contains a material to be filtered is passed through a porous membrane configured from a resin having a three-dimensional mesh structure, and a filtrate is separated from the material to be filtered; and a cleaning step in which the porous membrane has a cleaning solution passed therethrough or is immersed in the cleaning solution so that the interior of the porous membrane is cleaned, wherein the filtration method is characterized in that, in individual regions of a total of four fields of view in an SEM image of a cross-section of the porous membrane in the membrane thickness direction, which is orthogonal to the inside surface, the total of the area of a resin part having an area of at most 1 µm2 is 70% or greater of the total area of the resin part, and the cleaning solution is an oxygen-based oxidizing agent that has a standard electrode potential of at least 1 V, the four fields of view being a field of view that includes the inside surface of the porous membrane, a field of view that includes the outside surface thereof, and two fields of view imaged at equal intervals between these fields of view.
(FR) L'invention concerne un procédé de filtration qui comprend une étape de nettoyage et implique l'utilisation d'une membrane poreuse, le procédé de filtration offrant une résistance exceptionnelle à des solutions de nettoyage (produits chimiques) (résistance aux liquides chimiques) et une performance de filtration exceptionnelle, et possède une longue durée de vie. Un procédé de filtration comprend les étapes suivantes : une étape de filtration dans laquelle un liquide à traiter qui contient un matériau à filtrer traverse une membrane poreuse configurée à partir d'une résine de structure maillée tridimensionnelle, et un filtrat est séparé du matériau à filtrer; et une étape de nettoyage au cours de laquelle la membrane poreuse est traversée par une solution de nettoyage ou est immergée dans la solution de nettoyage de telle sorte que l'intérieur de la membrane poreuse est nettoyé, le procédé de filtration étant caractérisé en ce que, dans des régions individuelles d'un total de quatre champs de vision d'une image MEB d'une section transversale de la membrane poreuse dans l'épaisseur de la membrane, orthogonale à la surface intérieure, le total de la surface d'une pièce de résine ayant une superficie d'au plus 1 µm2 est de 70 % ou plus de la surface totale de la pièce de résine, et la solution de nettoyage est un agent oxydant à base d'oxygène qui a un potentiel d'électrode standard d'au moins 1 V, les quatre champs de vision étant un champ de vision comprenant la surface intérieure de la membrane poreuse, un champ de vision comprenant la surface extérieure de celle-ci, et deux champs de vision représentés à des intervalles égaux entre ces champs de vision.
(JA) 洗浄工程を含む多孔質膜を用いたろ過方法において、洗浄液(薬液)に対する耐性(薬液耐性)、ろ過性能に優れ、かつ、高寿命のろ過方法の提供。以下の工程:3次元網目構造の樹脂から構成される多孔質膜に、被ろ過物を含有する被処理液を通過させて、該被ろ過物からろ液を分離するろ過工程;及び該多孔質膜に洗浄液を通過又は浸漬させて、該多孔質膜の内部を洗浄する洗浄工程;を含むろ過方法であって、該多孔質膜の内側表面に直交する膜厚方向における膜断面のSEM画像における、該内側表面を含む視野、該膜の外側表面を含む視野、及びこれらの視野の間を等間隔で撮影した2視野の合計4視野の各領域において、1μm以下の面積を有する樹脂部の面積の合計が、該樹脂部の総面積に対して70%以上であり、かつ、該洗浄液が、標準電極電位が1V以上の酸素系酸化剤である、ことを特徴とする前記ろ過方法。
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)