| 摘要 |
N-Ethylpiperazine is isolated by distillation from a mixture consisting per 100 kg of a=from 30 to 90 kg of N-ethylpiperazine b=from 7 to 40 kg of N,N'-diethylpiperazine c=from 3 to 20 kg of piperazine d=from 0 to 30 kg of ethanol e=from 0 to 40 kg of water and f=from 0 to 5 kg of concomitants, by performing the distillation in the presence of x=y+e= from 3b to 12b of water, y being the quantity of water which has to be added, if necessary, to meet this condition, and successively separating from this mixture the fractions 1. water, ethanol, N,N'-diethylpiperazine and other highly volatile concomitants, 2. water, if present in excess, 3. piperzine and 4. pure N-ethylpiperazine as overhead products.
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