Gradient Elution of Coal Liquefaction Oil and Analysis of Aromatics Constitutes

The coal liquefaction oil was separated using gradient elution method and the aromatics were analyzed by gas chromatography and mass spectrometry (GCMS) and 1Hnuclear magnetic resonance (1HNMR). The results show that the aromatics are separated into light, middle and heavyaromatics by the method. The chemical shifts of the proton of aromatics in the low field NMR are at 6.9—7.2 for monoaromatics as well as 7.2—9.0 for multiaromatics.