Method for refining crude naphthalene through extractive distillation

The invention provides a method for refining crude naphthalene by extractive distillation, which takes sulfolane as an extracting agent, and adopts an extractive distillation tower and an extracting agent recovery tower to perform continuous distillation and purification on the crude naphthalene. The method is simple to operate and good in separation effect. 本发明提供一种萃取精馏精制粗萘的方法，以环丁砜为萃取剂，采用萃取精馏塔和萃取剂回收塔对粗萘进行连续精馏提纯。本发明操作简单，分离效果好。