Characterization of Coal Tar Pitch and Paving Pitch by UV,EA and NMR

In order to enlarge the use of coal tar pitch(CTP) in paving road, CTP and 60th paving pitch (PP) were extracted by n-heptane, toluene and ethanol step by step in a Soxhlet apparatus. The three fractions of CTP and PP were detected using UV-absorption( UV-A) ,elemental analyses(EA) and nuclear magnetic resonance( NMR) firstly as a whole unit after quality characterization of physical nature of CTP and PP were finished. The CTP had more saturate aliphatic and residue compounds dissolved in ethanol. On the other hand there were more continental type structures of aromatic ring than that of PP. There was almost no residue in PP after extracted by ethanol. The results explained why CTP was crisp in cold winter and was soften in summer. The following research will focus on how to change the chemical construction of CTP into the relative similar structures with those of PP through adding polymer.