Continuous distillation of thermolabile monomers

US6033530A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Winter · Dittelsheim-Heßloch, DE
• Jacques Dupuis · Ludwigshafen, DE

Key dates

• Filing date: Mar 14, 1997
• Grant date: Mar 7, 2000
• Expiry date: Mar 14, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C231/24
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the continuous distillation of thermolabile monomers under reduced pressure in a column includes PA1 feeding the thermolabile monomers in vapor or liquid form to the column, PA1 introducing an inert distillation aid which forms a heteroazeotrope with the thermolabile monomers into the vaporizer at the bottom of the column, but separately from the monomer feed, and vaporizing into there or feeding an emulsion of thermolabile monomers and an inert distillation aid into the vaporizer or into the column, PA1 condensing the azeotrope at the top of the column and separating it in a phase separator, taking off the thermolabile monomers and returning the distillation aid to the column or, if desired, working it up by distillation and PA1 taking off components having a higher boiling point than the thermolabile monomers from the bottom of the column.