Patent ID: 6033530
Filing Date: 2000-03-07
Classification: B01D,C07C

Abstract:
A process for the continuous distillation of thermolabile monomers under reduced pressure in a column which has a vaporizer at the bottom of the column, comprising(a) feeding the thermolabile monomers in vapor or liquid form into the column, and introducing an inert distillation aid comprising an aliphatic hydrocarbon having from 8 to 18 carbon atoms in the molecule or a mixture thereof, which forms a heteroazeotrope with said thermolabile monomers, into the vaporizer at the bottom of the column, wherein the thermolabile monomers are introduced into the column separate from the inert distillation aid or(b) feeding an emulsion of said thermolabile monomers and said inert distillation aid which forms a heteroazeotrope with said thermolabile monomers, into the vaporizer at the bottom of the column or into the column,(c) condensing the heteroazeotrope at the top of the column and separating it in a phase separator, such that components having a higher boiling point than the thermolabile monomers collect in a liquid phase in the column, taking off the thermolabile monomers and returning the distillation aid to the column and optionally working it up by distillation and(d) discharging said components having a higher boiling point than the thermolabile monomers which have collected in the liquid phase in the column, from the bottom of the column.