Method for making gas-separation membranes having improved flux and selectivity
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United States of America Patent
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Jun 5, 2018
Issued Date -
Oct 2, 2014
app pub date -
Mar 28, 2014
filing date -
Apr 1, 2013
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Abstract
A polymeric fiber for use in gas separation is formed from a spin dope which includes solvent and non-solvent materials. The fiber is passed through a quench bath, and then a leach bath, in which the solvent and non-solvent are removed. The quench bath and the leach bath include sets of rollers which transport the fiber through the system. Each set of rollers in the leach bath operates at a speed which is greater than or equal to the speed of the rollers which are immediately upstream. Thus, the fiber is stretched, in different amounts, at the same time that the solvent and non-solvent are being removed, and while the fiber is still wet. The resulting fiber has been found to exhibit superior flux and selectivity properties.
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