Process and apparatus for recovering a lower alcohol from a mixture thereof with water
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United States of America Patent
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Aug 11, 1992
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N/A
app pub date -
Oct 18, 1991
filing date -
Oct 19, 1990
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Abstract
A lower alcohol is recovered from a mixed liquid thereof with water, derived from a vapor drying procedure for a water-wetted article, for example, a water-washed lens or semiconductor wafer, by feeding the mixed liquid of a lower alcohol with water from the vapor drying procedure to a vaporizer; vaporizing the mixed liquid; feeding the mixed vapor into a gas-separating module comprising at least one gas-separating membrane, for example, composed of a aromatic polyimide hollow fiber, which allows a selective permeation of water vapor from a feed side to a permeated side therethrough, withdrawing a non-permeated vapor fraction containing the lower alcohol in an increased concentration from the feed side, and converting the vapor fraction to a high purity lower alcohol liquid by cooling, while discharging a permeated vapor fraction containing water in an increased concentration from the permeated side.
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