发明名称 |
Process for the continuous production of 2,2,6,6-tetramethyl piperidine. |
摘要 |
The reduction of triacetonamine with hydrazine also proceeds continuously by means of a reactive distillation if the hydrazone is first formed and this is continuously transported at the bottom of a distillation column into the distillation bottom, which consists of a high-boiling solvent and an alkali, and the resulting 2,2,6,6-tetramethylpiperidine is distilled off as an azeotrope. In this procedure, a hydrazine/triacetonamine ratio of 1.5 : 1 to 2.0 : 1 is sufficient, it being possible distinctly to increase the product yield (> 90%) compared with the conventional synthesis. Additionally, the amounts of alkali and solvents used can be distinctly reduced. |
申请公布号 |
EP0661265(A1) |
申请公布日期 |
1995.07.05 |
申请号 |
EP19940118823 |
申请日期 |
1994.11.30 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
KAMPMANN, DETLEF, DR.;STUHLMUELLER, GEORG |
分类号 |
C07D211/12;C07D295/023 |
主分类号 |
C07D211/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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