Abstract: As Tahe heavy crude oil becomes heavier, the flash point and PI values of paving asphalt from Tahe vacuum residue fail to meet the requirements of JTG F40-2004 specification for A grade asphalt. The effect of feed co-distillation of coker gas oil (CGO) and Tahe heavy crude oil on the properties of resulting Tahe vacuum residue was investigated. The results indicated that CGO is beneficial to increase the distillation cutting temperature and change the SARA distribution of asphalt. The suitable blending ratio of CGO is 15%. The flash point of blended asphalt increases from 237 ℃ to 258℃, and the PI value decreases from 1.33 to 0.57, meanwhile, the high temperature performance and anti-aging properties are improved. The blended asphalt meets the technical requirements of F40 JTG for A grade paving asphalt. The final asphalt mixture has very good anti-high temperature deformation ability and good water stability.

Key words: Tahe heavy crude oil, coker gas oil, paving asphalt, flash point, PI value