Porous hollow fiber membrane and method for producing porous hollow fiber membrane
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsYuki MIKI, Daisuke OKAMURA
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Abstract
Provided is a porous hollow fiber membrane made of a thermoplastic resin, wherein a membrane thickness is 0.050 mm or larger and 0.25 mm or smaller, and when a strength coefficient is defined as K=(compressive strength)/((membrane thickness)/(inside diameter/2))3, K=1.7 or more.
Claims20
A porous hollow fiber membrane made of a thermoplastic resin, wherein a membrane thickness is 0.050 mm or larger and 0.25 mm or smaller, and when a strength coefficient is defined as K=(compressive strength)/((membrane thickness)/(inside diameter/2))3, K=1.7 or more.
A hollow fiber membrane module having a hollow fiber membrane bundle and fixing parts at both ends of the hollow fiber membrane bundle, wherein:
- the end of one of the fixing parts seals a hollow part of the hollow fiber membrane, and the end of the other fixing part opens the hollow part;
- the hollow fiber membrane module is of external pressure type in which filtration is performed from the outside of the hollow fiber membrane where the hollow fiber membrane is exposed, to the inside thereof;
- and
- when a strength coefficient of the hollow fiber membrane is defined as K=(compressive strength)/((membrane thickness)/(inside diameter/2))3, K=1.7 or more.
A method for filtering a medium to be filtered through a hollow fiber membrane module, comprising the steps of:
- dipping the hollow fiber membrane module having an exposed hollow fiber membrane in a tank having the medium to be filtered;
- and
- filtering the medium to be filtered from the outside to the inside of the hollow fiber membrane, wherein
- when a strength coefficient of the hollow fiber membrane is defined as K=(compressive strength)/((membrane thickness)/(inside diameter/2))3, K=1.7 or more.
Dependencies are inferred from the claim text.