3-甲基-1-丁烯精馏分离工艺

Rectification separation process for 3-methyl-1-butene

采用三步精馏法从C5馏分分离产生的抽余液中分离制备3-甲基-1-丁烯，考察了工艺条件对精馏效率的影响。结果表明，采用该方法可得到纯度大于95％的3-甲基-1-丁烯，总收率为65．79％。脱轻塔中，于塔釜压力为0．35MPa，回流比为11—15，塔顶馏出率为0．34的最佳条件下操作时，3-甲基-1-丁烯收率为98．18％。浓缩塔中，于塔釜压力为0．20MPa，回流比为25，塔顶馏出率为0．26的最佳条件下操作时，3-甲基-1-丁烯收率为85．71％。精制塔中，于塔釜压力为0．20MPa，回流比为20～25，塔顶馏出率为0．26的最佳条件下操作时，3-甲基-1-丁烯收率为78．18％。

The 3 - methyl - 1 - butene was prepared with the raffinate of Cs fraction extracting separation as feed stock by three - stage rectification process, and the effect of processing conditions on rectification efficiency was investigated. The results showed that the purpose product with a purity of over 95% and a total yield of 65.79% could be obtained from the process. In light fraction removal column, the product yield could reach 98. 18% at a pressure of 0. 35 MPa,a reflux ration of 11 - 15 and a distillate ration of0. 26;in coneentration column,the product yield could reach 85.71% at a pressure of 0. 20 MPa, a reflux ration of 25 and a distillate ration of 0. 26;and in refining column, the product yield could reach 78.8% at a pressure of 0.20 MPa, a reflux ration of 20 - 25 and a distillate ratio of 0. 26.