Ultrathin high-performance hollow fiber membranes

Details Ultrathin high-performance hollow fiber membranes Ultrathin high-performance hollow fiber membranes

1998-06-19

2000-01-18

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264129, 264178F, 264184, 2642091, 26421114, 26421116, 264559, 264561, 264562, 264563, 427245, D01D 5247

Patent

active

060155167

ABSTRACT:
A process for forming ultrathin dense-layer asymmetric hollow fiber membranes with a dense layer of less than 500 .ANG. from a binary solution system comprising a polymer and a solvent. In this process, the spinning polymeric solution has a high viscosity and exhibits chain entanglement at the spinning temperature. The solubility parameter difference between the bore fluid and the spinning dope is less than 2.5 (cal/cm.sup.3).sup.0.5 and the volume ratio of bore-fluid flow rate to the dope flow rate is between 0.45 to 0.75. The dope is wet-spun into hollow fibers using water as external coagulant. The ultrathin dense-layer asymmetric hollow fiber membranes are suitable for air and other gas separations.

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