Process for separating propylene glycol from aqueous compositions
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United States of America Patent
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Jun 12, 2012
Grant Date -
Nov 27, 2008
app pub date -
Dec 13, 2006
filing date -
Dec 29, 2005
priority date (Note) -
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Abstract
The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M′) and mixture (M″); (II) separating the mixture (M′) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.
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