Separation of polycyclic aromatic hydrocarbons in soft pitch from coal tar and its compositions analysis
Abstract：Soft pitch was prepared by distilling coal tar at 380 ℃.Soft pitch was extracted with isometric carbon disulfide-acetone mixed solvent under ultrasonic radiation and room temperature.Polycyclic aromatic hydrocarbons（PAHs） in soft pitch were extracted by mixed solvent.The extracts were absorbed by silica gel.The silica gel was eluted with cyclohexane,methylbenzene and petroleum ether respectively,PAHs in soft pitch were separated by using column chromatographic method.A white crystal,a white powder and a colorless crystal（marked as P1,P2,P3 respectively） appeared in three eluents,and P1,P2 and P3 were analyzed with GC-MS respectively.The results show that P1 is mainly composed of 3-ring PAHs and heterocyclic compounds,P2 is mainly composed of 4-ring PAHs and heterocyclic compounds,and P3 is composed of 4-ring or 5-ring PAHs.
Keywords：coal tar pitchcarbon disulfide-acetone mixed solventcolumn chromatographic methodGC-MS analysis
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)