Importance

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Abstract

In a process for the continuous distillation of thermolabile monomers under reduced pressure in the presence of formamide in a column, the thermolabile monomers are continuously fed in liquid form, separately from formamide, into the lower part of the column up to the middle of the column, Formamide is vaporized with a vaporizer at the bottom of the column and, together with constituents having higher boiling points than the thermolabile monomers, is discharged from the bottom of the column and replaced by addition of fresh formamide, the thermolabile monomers are taken off at a side offtake in the upper third of the column, with the distillation being controlled such that the monomers contain less than 5% by weight of formamide, and a product stream containing constituents which have a lower boiling point than the thermolabile monomers is taken off at the top of the column.

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First Claim