| PATENT ASSIGNEE'S COUNTRY | Germany |
| UPDATE | 09.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
(a) Continuously feeding monomer in liquid form, separately from formamide, above the metering-in point for the gaseous formamide (b) Vaporizing formamide by means of a vaporizer at the bottom of the column & discharging formamide from the bottom of the column together with constituents having higher boiling points than the monomers (c) Adding the formamide (d) Removing the monomers from a side off-take in the upper third of the column, while controlling the distn such that said monomers contain < 5% by wt. of formamide (e) Taking a prodt stream contg constituents which have a lower boiling point than monomer off at the top of column |
| PATENT PHOTOCOPY | Available on request |
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