| 摘要 |
A process for purifying raw piperidines of formula (I), where R<1> to R<4> are C1 to C6 alkyl, R<1> and R<2> and/or R<3> and R<4> together are a CH2 chain with 2 to 5 C atoms. Said process is characterized in that in an initial step high-boiling-point substances and possible water are eliminated by distillation from the raw piperidines, in a second step 0.01 to 5 wt %, in relation to the product of the first step, of a reducing agent are added and in a third step the piperidines are isolated by distillation.
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| 申请人 |
BASF AG, 67063 LUDWIGSHAFEN, DE |
发明人 |
JULIUS, MANFRED, DR., 67117 LIMBURGERHOF, DE;RUST, HARALD, 67435 NEUSTADT, DE;KRAUSE, ALFRED, DR., 67346 SPEYER, DE;SIEGEL, HARDO, DR., 67346 SPEYER, DE;SIEGEL, WOLFGANG, DR., 67117 LIMBURGERHOF, DE;WITZEL, TOM, DR., 67069 LUDWIGSHAFEN, DE |
