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US 6,495,041 B2Granted
Method for purifying aqueous suspension
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTohru Taniguchi, Nobuhiko Suga, Takehiko Otoyo
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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTohru Taniguchi, Nobuhiko Suga, Takehiko Otoyo
Estimating the term…
A method and apparatus for purifying an aqueous suspension comprising feeding an aqueous suspension containing fine particles comprising an inorganic component from the outer surface of a wavy hollow fiber membrane having an outer diameter of from 0.5 to 3.1 mm to filter, followed by physical wash of the hollow fiber membrane. The purifying method can reduce the damage of the membrane outer surface during the physical wash step, prevent open pores on the surface from covering and achieve stable filtration. The hollow fiber membrane bundle can be produced by having a pulsation flow contacted with the hollow fiber material being extruded from the double spinning nozzle under specific conditions and cooling and solidifying or coagulating it while shaking.
A hollow fiber membrane bundle which is prepared by collecting a plurality of wavy hollow fiber membranes so as to orient in a same direction with a bulkiness of from 1.45 to 2.00, the bulkiness being defined by S1/S2, where S1 is a cross sectional area of bundle of a given number of hollow fiber membranes and S2 is a cross sectional area of a single hollow fiber membrane multiplied by the given number of hollow fiber membranes,
A method for producing a hollow fiber membrane bundle comprising the steps of:
A hollow fiber membrane module, wherein a plurality of wavy hollow fiber membranes each having an inner diameter of 0.3 to 1.7 mm, an outer diameter of 0.5 to 3.1 mm, a membrane thickness of 0.1 to 0.7 mm and a flatness of 0.8 to 1.0, where the flatness is a ratio of an inner minor axis to an inner major axis of the hollow fiber membrane, is collected so as to orient in a same direction with a bulkiness of from 1.45 to 2.00, the bulkiness being defined by S1/S2, where S1 is a cross sectional area of a bundle of a given number of hollow fiber membranes and S2 is a cross sectional area of a single hollow fiber membrane multiplied by the given number of hollow fiber membranes, and mounted with a packing ratio of from 35 to 55%.
Dependencies are inferred from the claim text.