Patent ID: 7670464
Filing Date: 2010-03-02
Classification: C07C,Y10S

Abstract:
1. A process for distillatively separating a mixture comprising a vinyl ether of the general formula (I) and alcohol of the general formula (II) wherein R 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), comprising: a) passing the mixture into a first distillation column and withdrawing, as a top product, an azeotrope comprising vinyl ether (I) and alcohol (II) and, as a bottom product, a stream enriched with the alcohol (II); b) passing the azeotrope comprising 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 the vinyl ether, as a gaseous sidestream in a stripping section of the second distillation column in a region of the lower 25% of a total number of theoretical plates, and, as a top product, an azeotrope comprising vinyl ether (I) and alcohol (II); and c) recycling the azeotrope comprising vinyl ether (I) and alcohol (II) from the second distillation column into the first distillation column.