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Self supporting hollow fiber membrane and method of construction

  • US 6,074,718 A
  • Filed: 02/06/1996
  • Issued: 06/13/2000
  • Est. Priority Date: 02/06/1996
  • Status: Expired due to Fees
First Claim
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1. A semipermeable hollow fiber ultrafiltration membrane for liquid/liquid separation formed from a composition comprising an engineering thermoplastic resin, wherein the thermoplastic resin is polyvinylidene fluoride, a pore forming agent, and a solvent capable of solubilizing the polyvinylidene fluoride and the pore forming agent, the membrane having an asymmetrical pore structure to provide a low transmembrane pressure drop, a porosity in the range of about 25% to about 60%, and pore sizes in the range of from about 0.003 to about 1 micron in diameter, wherein the membrane is capable of functioning as a liquid/liquid ultrafiltration separation membrane absent further treatment.

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