发明名称 |
PROCESS FOR THE CONTINUOUS PREPARATION OF 2,2,6,6-TETRAMETHYLPIPERIDINE |
摘要 |
The reduction of triacetonamine with hydrazine also succeeds continuously by reactive distillation if the hydrazone is first formed and this is continuously transported to the distillation bottoms comprising a high-boiling solvent and an alkali at the base of a distillation column and the resulting 2,2,6,6-tetra-methylpiperidine is distilled off as an azeotrope. In this procedure a hydrazine/triacetonamine ratio of 1.5:1 to 2.0:1 is sufficient, in comparison with the conventional synthesis, the product yield being able to be considerably increased (>90 %). Moreover, the amounts of alkali and solvent used can be considerably reduced. |
申请公布号 |
CA2137747(A1) |
申请公布日期 |
1995.06.12 |
申请号 |
CA19942137747 |
申请日期 |
1994.12.09 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
KAMPMANN, DETLEF;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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