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.