Composite porous hollow fiber membrane and preparation method, membrane module and operation method
An operation method and fiber membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of rising filtration pressure and difficulty in maintaining filtration volume, and achieve the effect of inhibiting occlusion
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Embodiment 1
[0390] 35% by weight of 1,1-difluoroethylene homopolymer with a weight average molecular weight of 417,000 (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 65% by weight of γ-butyrolactone Dissolved at 150°C. The crystallization temperature Tc of the 1,1-vinylidene fluoride homopolymer solution (ie, raw material solution) obtained in this way was 46°C.
[0391] For the pressurization and discharge of the raw material liquid, an apparatus including a double pipe die, a pipe connected to the die, and two gear pumps arranged on the pipe was used. In the piping between the gear pumps, the above-mentioned raw material solution was retained at 99 to 101° C. for 15 seconds while being pressurized to 2.5 MPa. Then, while discharging an 85% by weight aqueous solution of γ-butyrolactone from the inner tube of the double tube die, the raw material solution was discharged from the outer tube. The raw materia...
Embodiment 2
[0401] A raw material liquid was prepared in the same manner as in Example 1, except that the concentration of the 1,1-vinylidene fluoride homopolymer was 36% by weight. The Tc of the raw material liquid was 48°C.
[0402] After pressurizing the raw material liquid in the same manner as in Example 1, it was discharged from the double pipe die. Make the discharged raw material solution stay in the first cooling bath at a temperature of 10° C. made of 85% by weight of γ-butyrolactone aqueous solution for 10 seconds, and further, make it cool at a temperature of 20°C made of 85% by weight of γ-butyrolactone aqueous solution ℃ in the second cooling bath for 20 seconds to solidify.
[0403] The obtained hollow fiber had a columnar structure with a thickness uniformity of 0.64, a columnar structure occupancy rate of 87%, and a spherical structure occupancy rate of 13%.
[0404] Next, the hollow fiber obtained above was stretched 2.4 times at a stretching rate of 44% / sec in water at ...
Embodiment 3
[0410] A raw material liquid was prepared in the same manner as in Example 1, except that the concentration of the 1,1-vinylidene fluoride homopolymer was 39% by weight. The Tc of the raw material liquid was 52°C.
[0411] While pressurizing the raw material solution to 2.5 MPa with the same apparatus as in Example 1, it was allowed to stay at 99 to 101° C. for 20 seconds. Then, it discharged|emitted from the double pipe type die similarly to Example 1. Make the discharged raw material liquid stay in the 1st cooling bath of the temperature 5 ℃ that is made of 85% by weight aqueous solution of γ-butyrolactone for 10 seconds, then, make it be made in the temperature 30 ℃ that is made of 85% by weight aqueous solution of γ-butyrolactone ℃ in the second cooling bath for 40 seconds to solidify.
[0412] The obtained hollow fiber had a columnar structure with a thickness uniformity of 0.69, a columnar structure occupancy rate of 91%, and a spherical structure occupancy rate of 9%....
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