摘要 |
Process for distillatively separating a mixture containing a vinyl ether of the general formula (I) <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>1</SUP>-O-CH-CH<SUB>2 </SUB> (I) <?in-line-formulae description="In-line Formulae" end="tail"?> and alcohol of the general formula (II) <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>2</SUP>-OH (II) <?in-line-formulae description="In-line Formulae" end="tail"?> in which R<SUP>1 </SUP>and R<SUP>2 </SUP>are each independently a saturated or unsaturated, aliphatic or cycloaliphatic radical having from 2 to 10 carbon atoms, and in which the alcohol (II) has a boiling point which is at least 1° C. higher, measured at or extrapolated to 0.1 MPa abs, than the vinyl ether (I), by a) passing the mixture into a first distillation column and withdrawing, as a top product, an azeotrope containing vinyl ether (I) and alcohol (II) and, as a bottom product, a stream enriched with the alcohol (II); b) passing the azeotrope containing vinyl ether (I) and alcohol (II) from the first distillation column into a second distillation column which is operated at a pressure which is from 0.01 to 3 MPa higher compared to the first distillation column, and withdrawing, as a bottom product or gaseous sidestream in the stripping section, the vinyl ether (I) and, as a top product, an azeotrope containing vinyl ether (I) and alcohol (II); and c) recycling the azeotrope containing vinyl ether (I) and alcohol (II) from the second distillation column into the first distillation column. |