Title:
FILTRATION METHOD USING POROUS MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2019/049857
Kind Code:
A1
Abstract:
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.
Inventors:
OKAMURA DAISUKE (JP)
Application Number:
PCT/JP2018/032736
Publication Date:
March 14, 2019
Filing Date:
September 04, 2018
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
International Classes:
C02F1/44; B01D65/06; B01D69/00; B01D69/08; B01D71/34; C08J9/26
Domestic Patent References:
| WO2008120509A1 | 2008-10-09 | |||
| WO2017155004A1 | 2017-09-14 |
Foreign References:
| JP2012040461A | 2012-03-01 | |||
| CN102527250A | 2012-07-04 | |||
| CN102764597A | 2012-11-07 | |||
| JP2016523698A | 2016-08-12 | |||
| JP2012511413A | 2012-05-24 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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