Title:
FILTRATION METHOD USING POROUS MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2019/049858
Kind Code:
A1
Abstract:
A filtration method that includes a cleaning step using a chemical agent, wherein provided is the filtration method with excellent chemical resistance performance. The filtration method pertaining to the present invention comprises a filtration step in which a liquid to be filtered is filtered by being passed through a porous membrane formed of a resin, and a cleaning step in which the membrane interior of the porous membrane is cleaned after the filtration step, wherein a porous membrane for which the area ratio of a resin part having an area of 1 µm2 or less included in a cross section of the membrane interior is at least 70% of the total area of the entire resin part included in the cross section, and said cleaning step includes a step in which an aqueous solution of at least 1% sodium hydroxide is passed through the porous membrane.
Inventors:
OKAMURA DAISUKE (JP)
Application Number:
PCT/JP2018/032737
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 | |||
| JP2013075294A | 2013-04-25 | |||
| CN102527250A | 2012-07-04 | |||
| CN102764597A | 2012-11-07 | |||
| JP2012511413A | 2012-05-24 | |||
| JP2016523698A | 2016-08-12 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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