双回流动态累积间歇精馏全过程的研究

在动态累积间歇精馏塔中,采用双回流动态累积间歇精馏操作对正丙醇-异丙醇二元混合物系进行分离研究。主要考察了操作时间对塔顶整个过程产品浓度、温度变化的影响,并与塔顶回流动态累积间歇精馏操作的分离结果进行了比较,以及过渡馏分阶段操作时间对塔釜正丙醇浓度及温度变化的影响,同时,又对正丙醇的回收进行了研究。结果表明,在同样的产品采出要求条件下,双回流动态累积间歇精馏操作时,随原料中异丙醇含量的增加,所需的操作时间越长,产品的纯度越高,收率越高;操作时间节省166 min,原料中异丙醇质量分数为30%的条件下,所得回收正丙醇的纯度达到91.22%,正丙醇的回收率可达62.93%,原料中异丙醇质量分数别为30%、50%、70%时对应过渡馏分持续时间分别为40、47、58 min;原料中异丙醇质量分数越大,所得回收正丙醇产品的量越少,正丙醇的纯度越低,回收率越小。

Study on dynamic-accumulation batch distillation of a noveloperation tower with double-reflux

A novel double-reflux operation mode by reflux at both top and bottom was applied in a dynamic-accumulation batch distillation tower.Binary mixture of 1-propanol and 2-propanol as the separated system,in the state progress the mass fraction change of 2-propanol and temperature with operation time at top was studied,while the effection was compared with the operation by reflux at top;during slop cut stage the mass fraction change of 1-propanol and temperature at bottom with operation time were mainly discuss...