Process for preparing reverse-osmosis membrane, and membrane obtained with the process
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United States of America Patent
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Jul 2, 1991
Issued Date -
N/A
app pub date -
Oct 20, 1989
filing date -
Feb 10, 1989
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for preparing polypiperazinamide-based reverse-osmosis membranes comprising: (a) preparing a solution of polypiperazinamide in a polar organic solvent; (b) applying the solution on a planar support so as to form a planar body; (c) evaporating the solvent under the action of a flow of air, said air flow having, with respect to said planar support, such a speed as to produce Reynolds numbers between 5 and 100; (d) gelling the planar body by phase reversal by passing through a coagulation bath to form the membrane; and (e) washing the membrane to extract the solvent contained therein. The entire process is carried out at a temperature lower than about 30.degree. C. The invention allows the production of reverse-osmosis membranes with high flow and high mechanical characteristics.
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