After last step of the piperazine reaction,the mixture of alcohol and water instead of water be used for the last treatment.The recovery of piperazine was simple.The cost was reduced.
英
美
- 在最后一步与哌嗪缩合后,后处理采用醇水混合物代替水,使哌嗪的回收更加简便,降低了成本。