Composite porous hollow fiber membrane, composite porous hollow fiber membrane module and operating method thereof
An operating method and fiber membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of rising filtration pressure, difficulty in maintaining filtration volume, etc., and achieve the effect of inhibiting occlusion and excellent chemical durability.
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Embodiment 1
[0365] 36% by weight of 1,1-vinylidene fluoride homopolymer (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 64% by weight of γ-butyrolactone were dissolved at 150°C. The crystallization temperature Tc of this 1,1-vinylidene fluoride homopolymer solution was 48°C.
[0366] For the pressurization and discharge of the film-forming stock solution, an apparatus including a double pipe die, a pipe connected to the die, and two gear pumps arranged on the pipe was used.
[0367] The membrane-forming stock solution was kept at 99 to 101° C. for 20 seconds while pressurizing it to 2.0 MPa in the piping between the gear pumps. Then, while discharging an 85% by weight aqueous solution of γ-butyrolactone from the inner tube of the double-tube die, the film-forming stock solution was discharged from the outer tube. The film-forming stock solution discharged in this way was allowed to stay in a cooling bath at ...
Embodiment 2
[0378] 36% by weight of 1,1-vinylidene fluoride homopolymer (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 64% by weight of γ-butyrolactone were dissolved at 150°C. The Tc of this 1,1-vinylidene fluoride homopolymer solution was 48°C.
[0379] Using the same apparatus as in Example 1, the film-forming stock solution was pressurized to 2.0 MPa and allowed to stay at 99 to 101° C. for 20 seconds. Then, while discharging an 85% by weight aqueous solution of γ-butyrolactone from the inner tube of the double tube die, the film-forming stock solution was discharged from the outer tube of the double tube die. Make the discharged film-forming stock solution stay in the first cooling bath at a temperature of 5° C. consisting of an 85% by weight aqueous solution of γ-butyrolactone for 10 seconds, and then place it in a temperature of 25° C. Solidification was carried out by staying in the second cooling b...
Embodiment 3
[0387] 38% by weight of 1,1-vinylidene fluoride homopolymer (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 62% by weight of γ-butyrolactone were dissolved at 150°C. The Tc of this 1,1-vinylidene fluoride homopolymer solution was 51°C.
[0388] Using the same apparatus as in Example 1, the film-forming stock solution was pressurized to 2.0 MPa and allowed to stay at 99 to 101° C. for 20 seconds. Then, while discharging an 85% by weight aqueous solution of γ-butyrolactone from the inner tube of the double-tube die, the film-forming stock solution was discharged from the outer tube. The discharged film-forming stock solution was allowed to stay in the first cooling bath at a temperature of 5°C consisting of an 85% by weight aqueous solution of γ-butyrolactone for 10 seconds, and then placed in a temperature of 35°C consisting of an 85% by weight aqueous solution of γ-butyrolactone. Solidified by st...
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