从洗油中分离喹啉的新方法

以洗油为原料,通过精馏-共沸精馏法,研究了喹啉的分离精制。首先精馏洗油,切取不同温度段的馏分,然后分别与共沸剂乙二醇进行共沸精馏试验;在共沸精馏中,通过改变馏分与共沸剂的质量比和回流比,考察了不同条件对喹啉纯度的影响。结果表明:①精馏洗油切取喹啉馏分的较佳条件为:回流比为10∶1,切取温度范围为220~230℃;②共沸精馏的较佳条件为:回流比为10∶1,喹啉馏分与共沸剂的质量比为1∶2.4,切取温度范围为188.4~188.8℃,喹啉的纯度可达98.5%。该方法具有操作简单、步骤少、纯度高、无污染的特点。

New method of separating quinoline from wash oil

The separation and purification of quinoline were studied by the way of rectification-azeotropic distillation with wash oil as raw material in the paper.First,the fractions in different temperature ranges were ingathered by rectifying wash oil;azeotropic distillation were done with the different fractions and ethanediol respectively.The effects of different conditions on quinoline's purity were investigated by changing the quality ratio of fraction to ethanediol and reflux ratio in the azeotropic distillation experiments.The results of experiments shows that when reflux ratio is 10 ∶1 and the temperature range of fraction is 220～230 ℃,the best result is gotten in the rectification experiments;when reflux ratio is 10 ∶1,quality ratio of fraction to ethanediol is 1 ∶2.4 and the temperature range of ingathering quinoline is 188.4～188.8 ℃,the best result is gotten in the azeotropic distillation experiments.The method has many characteristics such as simple operation,less procedures,higher purity(≥98.5%),no pollution.