Highly aromatic anisotropic polyurea/urethane membranes and their use for the separation of aromatics from non-aromatics
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United States of America Patent
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May 9, 1989
Grant Date -
N/A
app pub date -
Oct 14, 1987
filing date -
Oct 14, 1987
priority date (Note) -
Expired
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Abstract
An anisotropic elastomeric membrane preferably made from polyurea/urethane has been prepared. These anisotropic membranes are made from the corresponding polymeric material by preparing the polymeric material in a good solvent containing less than 5 vol % non-solvent, producing a film of the polymer solution on a support with a maximum pore size less than 20 microns, subjecting the film to conditions such that the solvent vapor pressure-time factor is 1000 mm Hg-min. or less, preferably 200 mm Hg-min or less, most preferably approaching 0 mm Hg-min and quenching the membrane film in a non-solvent yielding a three-layered anisotropic membrane.
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