发明授权
- 专利标题: Porous hollow fiber membranes and method of making the same
- 专利标题(中): 多孔中空纤维膜及其制造方法
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申请号: US09884084申请日: 2001-06-20
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公开(公告)号: US06890436B2公开(公告)日: 2005-05-10
- 发明人: Kensaku Komatsu , Ichirou Kawata , Shigenobu Ishii , Yoshio Sato , Seiichi Nakahara
- 申请人: Kensaku Komatsu , Ichirou Kawata , Shigenobu Ishii , Yoshio Sato , Seiichi Nakahara
- 申请人地址: JP Kurashiki
- 专利权人: Kuraray Co., Ltd.
- 当前专利权人: Kuraray Co., Ltd.
- 当前专利权人地址: JP Kurashiki
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权: JP2000-186034 20000621; JP2000-190739 20000626
- 主分类号: B01D63/02
- IPC分类号: B01D63/02 ; B01D67/00 ; B01D69/02 ; B01D69/08 ; B01D71/68 ; C02F1/44 ; D01D5/24 ; D01D5/247 ; D01F6/26 ; B01D39/14
摘要:
A porous hollow fiber membrane having a particle cutoff within the range of 1 to 10 μm and a pure water permeate flow equal to or higher than 30,000 L/m2/hr/100 kPa. This porous hollow fiber membrane can be prepared by a method including, while a spinning dope containing a base polymer as a material for forming the porous hollow fiber membrane, an additive used for facilitating a phase separation of the spinning dope, a solvent compatible with both the base polymer and the additive and a mass of microparticles insoluble to the compatible solvent and uniformly dispersed in a liquid medium and having an average particle size within the range of 1 to 20 μm, and a coagulating liquid for forming the hollow fiber membrane is used, a step of forming the hollow fiber membrane according to a dry-wet spinning method or a wet spinning method, and a step of extracting and removing the microparticles by immersing the hollow fiber membrane, which has been spun, into an extracting solution effective to dissolve the microparticles, but ineffective to dissolve the base polymer.