| PATENT ASSIGNEE'S COUNTRY | Germany |
| UPDATE | 03.99 |
| PATENT ASSIGNEE | Hoechst |
| PATENT CLAIMS |
- Feeding mixt into extractive distn column - Adding organic liquid (extractant) in top part of column - Taking off chloromethane vapor at top of column - Taking off mixt of (Me)2O & extractant at bottom of column - Feeding mixt taken off in fourth step into distn column - Taking of di-Me ether vapor at top of column - Taking off extractant at bottom of column & then feeding it again into extractive distn column |
| PATENT PHOTOCOPY | Available on request |
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