Separation method for polycyclic aromatic hydrocarbons

Abstract

A separation method for polycyclic aromatic hydrocarbons is provided. A mixed solvent and a to-be-separated mixture are first mixed and then filtered to obtain a filter cake and a filtrate, and then a back extraction agent and the filtrate are mixed and separated, where the mixed solvent is a naphthalene-based mixed solvent or an imidazole-based mixed solvent, and the to-be-separated mixture is a mixture containing bicyclic aromatic hydrocarbons and tricyclic aromatic hydrocarbons or a mixture containing tricyclic aromatic hydrocarbons and tetracyclic aromatic hydrocarbons. A mixture containing bicyclic aromatic hydrocarbons and tricyclic aromatic hydrocarbons is separated by using a naphthalene-based mixed solvent, and a mixture containing tricyclic aromatic hydrocarbons and tetracyclic aromatic hydrocarbons is separated by using an imidazole-based mixed solvent, and the naphthalene-based mixed solvent or the imidazole-based mixed solvent can be recycled. In addition, the separation method has simple steps, low energy consumption and a simple process flow.

Dependencies are inferred from the claim text.