双回流动态累积间歇精馏分离正丙醇-异丙醇物系过渡馏分的研究

Slop Cut in Separation of 1-Propanol from 2-Propanol by Dynamic-Accumulation Batch Distillation with Double-Reflux

在双回流动态累积间歇精馏实验装置中,以正丙醇-异丙醇为物系进行了间歇精馏实验,考察了操作时间对过渡馏分采出段塔顶馏出液中正丙醇和异丙醇的含量及塔顶温度、塔釜液正丙醇含量及塔釜温度的影响。实验结果表明,原料中异丙醇质量分数别为30%,50%,70%时,对应的过渡馏分采出段操作时间分别为38,46,57min;原料中异丙醇的含量越低,正丙醇回收率越高。在原料加入量为1L、加热功率为150W、原料中异丙醇质量分数为30%的条件下,回收得到的正丙醇质量分数可达到86.66%,此时正丙醇的回收率为67.57%,过渡馏分的量最少,操作时间最短。

Batch distillation of 1-propanol-2-propanol binary system was carried out in a set of dynamic-accumulation batch distillation apparatus with double-reflux. The effects of operation time on mass fractions of 1-propanol and 2-propanol in the column top distillate, the column top temperature, mass fraction of 1-propanol in the column bottoms and the column bottom temperature in the slop cut stage were investigated. The experimental results indicated that, when mass fraction of 2-propanol in the feed was 30%, 50% and 70%, the operation time of the corresponding slop cut stage was 38, 46 and 57 min. The 1-propanol yield increased while the mass fraction of 2-propanol in the feed decreased. Under the conditions of feed 1000 mL, heating power 150W and mass fraction of 2- propanol in the feed 30%, mass fraction of 1-propanol in the products was 86.66% and its yield was 67.57%, and the slop cut mass reached the minimum and the operation time of the slop cut stage was the shortest.