Highly asymmetric ultrafiltration membranes

B - Operations – Transporting – 01 – D

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B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/68 (2006.01)

Patent

CA 2293802

The present invention relates to highly asymmetric polymer membranes for ultrafiltration (UF), and to a simplified method of their manufacture. Disclosed herein are UF membranes with a high degree of asymmetry between the size of pores at the skin face of the membrane and the size of pores at the opposite face of the membrane. Asymmetry ratios of these membranes range from about 20 to about 1000. The porous support layer bewteen the skin face and the opposite face is reticular and is substantially free of macrovoids. These membranes thus have higher flow rates than prior UF membranes. The membranes are cast from polymer dope mixes that are either homogeneous solutions or stable colloidal dispersions.

La présente invention concerne des membranes d'ultrafiltration polymériques hautement asymétriques et un procédé simplifié de fabrication de ces dernières. L'invention se rapporte à des membranes d'ultrafiltration présentant un degré élevé d'asymétrie entre la taille des pores se trouvant sur la peau de la membrane et la taille des pores se trouvant sur la face opposée de la membrane. Les taux d'asymétrie de ces membranes varient de 20 à 1000 environ. La couche de support poreux entre la peau et la face opposée est réticulé et essentiellement dépourvu de macro-vides. Ces membranes présentent par conséquent des vitesses de circulation supérieures à celles des membranes d'ultrafiltration de l'état antérieur de la technique. Les membranes de la présente invention sont coulées à partir de masses de filage de mélanges de polymères composées de solutions homogènes ou de dispersions colloïdales stables.

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