Abstract: The goal of this study was to develop a new processing method for coal tar modification. Coal tar was extracted by binary mixed solvents which consist of toluene and n-heptane. Purified tar and coal tar pitch were obtained in the process. The results indicate that the ash content of coal tar is decreased from 1.89% to 0.03%, TI content is reduced from 9.56% to 0.31%, HI content is lowered from 15.26% to 4.09%, and carbon residue is decreased from 4.07% to 0.39% under the conditions of mass ratio of toluene to n-heptane of 0.5:1, the mass ratio of binary extractant to coal tar 1.5:1, and the extraction temperature 70 ℃. The yield of purified tar which can be used as hydrogenation feedstock is 83.2%. Meanwhile, the by-product, coal tar pitch, was investigated to be used as petroleum asphalt to prepare heavy traffic road pavement by mixing with shale oil pitch from Fushun. The study finds that when the content of coal tar pitch is 10%, the performance of the mixed asphalt meets the quality standard of AH-90.

Key words: coal tar, extraction, hydrogenation feed, heavy traffic road asphalt