Method for removing diluent from an extrudate of a polymer solution
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United States of America Patent
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Apr 23, 2013
Grant Date -
Oct 28, 2010
app pub date -
Dec 12, 2008
filing date -
Dec 14, 2007
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Abstract
The invention relates to a method for removing diluent from a polymer extrudate, especially in connection with a process for producing a microporous membrane. The method involves contacting the extrudate with a second solvent in a first stage; contacting the extrudate from the first stage with a third solvent in a second stage; conducting a first stream away from the first stage and/or conducting a second stream away from the second stage; and cooling at least a portion of the first and/or second stream and separating therefrom at least one of a first phase rich in the second solvent or a second phase rich in the third solvent.
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