AN INVESTIGATION ON COKE FORMATION FROM OXIDIZED PITCH

A commercial QI free coal tar was air blown at 300?℃ for 8?h, 10?h and 12?h. The air blown pitches and raw coal tar were characterized by elemental analysis, FT IR, 1?H NMR, 13 C NMR, solubility in hexane and toluene, and optical microscopy. The air blown pitches were carbonized at 480?℃ under 1.6?MPa in a tube reactor. The results showed that the anisotropic unit size of optical texture of coke decreased with increasing air blowing time of the pitches, while the coke derived from co carbonization of the air blown pitches and tetrahydronaphthalene showed a larger anisotropic unit size of optical texture as a result of the hydrogen donor effect of the tetrahydronaphthalene.