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Hollow-fiber membrane and process for production of hollow-fiber membrane

A manufacturing method and silk membrane technology, applied in the field of hollow fiber membranes, can solve the problems of reducing the diameter of double-ring nozzles and unrealistic industry, and achieve the effects of increasing the filling membrane area, low exchange frequency, and reducing energy load

Active Publication Date: 2011-08-10
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, reducing the diameter of the double-ring nozzle forces each desired hollow fiber membrane to be replaced once, which is not practical in industry
In addition, when the hollow fiber membrane manufactured by only reducing the diameter of the double-ring nozzle and the low spinning draft ratio is assembled into the module at the same filling rate as the module filled with the existing thick-diameter hollow fiber membrane, the turbidity removal performance can only be improved Membrane area increase component

Method used

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  • Hollow-fiber membrane and process for production of hollow-fiber membrane
  • Hollow-fiber membrane and process for production of hollow-fiber membrane
  • Hollow-fiber membrane and process for production of hollow-fiber membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0088]15 parts by weight of polysulfone (hereinafter PSf, manufactured by BASF Corporation: ULTRASONE S6010), 7 parts by weight of polyvinylpyrrolidone (hereinafter PVP, manufactured by ISP Corporation K-90: ​​molecular weight 1.2 million), 75 parts by weight of dimethylacetamide ( The following DMAc) and 3 parts by weight of water were dissolved and stirred to prepare a membrane-forming stock solution. The viscosity of the membrane-forming stock solution at 40° C. was 3.4 Pa·s. This film-forming stock solution was discharged from a double-ring nozzle with a peripheral slit width of 0.15 mm kept at 40° C., passed through a predetermined dry length, and was wound up at 36 m / min after coagulation and water washing. In this case, the discharge amount of the membrane-forming stock solution was adjusted so that the thickness of the hollow fiber membrane was 0.07 mm and the outer diameter was 0.36 mm. In addition, the discharge linear velocity in the double ring nozzle obtained by ...

Embodiment 2

[0093] A hollow fiber membrane was produced by the same method as in Example 1, and the discharge amount of the membrane-forming stock solution was adjusted so that the thickness of the hollow fiber membrane was 0.065 mm and the outer diameter was 0.35 mm. The spinning draft ratio at this time was 7.0. The obtained hollow fiber membrane has an asymmetric structure, and a dense structure is formed on the outer surface. 2-a and 2-b are SEM photographs of the outer surface and inner surface of the film obtained in Example 2. When the porosity was measured based on this, the porosity of the outer surface was 13.7%, the porosity of the inner surface was 17.1%, and no large voids were formed on both surfaces of the film.

[0094] Based on the thick white dotted line in Figure 2-a, the pores formed on the outer surface of the hollow fiber membrane were extracted in the same manner as in Example 1 (Figure 2-c), and when the aspect ratio was measured, the aspect ratio was 3.7 and the ...

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Abstract

A module provided with a hollow-fiber membrane which has a dense layer either on the inside or on the outside and in which the aspect ratios of pores formed on the dense-layer-side surface of the membrane are 3 to 5. The module exerts purification performance higher than that expected to be attained by an increase in membrane area and can reduce the frequency of cartridge replacement.

Description

technical field [0001] The present invention relates to a hollow fiber membrane that can be suitably used as a separation membrane of a water purifier or the like, and a method for producing the hollow fiber membrane. Background technique [0002] At present, hollow fiber membrane modules that perform filtration or dialysis of substances contained in the liquid to be treated are used in water treatment such as precision filtration and ultrafiltration because the effective membrane area per unit volume increases, nitrogen, oxygen, hydrogen, etc. Such as gas separation, pharmaceuticals, biology and many other fields. [0003] The hollow fiber membranes used were mainly homogeneous membranes at first, but with the pursuit of permeability, membranes with asymmetric structures provided with dense layers are becoming mainstream. [0004] Hollow fiber membranes with an asymmetric structure are formed using a double-ring nozzle, and a liquid is injected into the center tube to form...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/68C02F1/44
CPCB01D2325/02B01D71/68B01D69/08B01D2325/021B01D69/087
Inventor 上阪努谷典浩
Owner TORAY IND INC
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