关键词: 溶剂脱沥青, 超临界, 脱油沥青, 颗粒

Abstract: De-oiled asphalt (DOA) was obtained from a supercritical solvent deasphalting device using vacuum residuum of Liaohe heavy crude as feed and it was manufactured to particles by PGSS process directly. The effects of operation parameters on the yield, properties and particle size distributions of DOA were investigated under a pressure range of 5.0~7.0 MPa and a temperature range of 150~165℃. Results show that with the increase of pressure and decrease of temperature, the DOA yield decreases and the specific heat capacity of constant pressure decreases as well, yet the softening point of DOA increases. It is also shown that with the increase of system pressure and the decrease of temperature, the formation of small size asphalt particles were in favored, the mass fraction of less than 50 mesh particles reaches more than 66%. The DOA properties varied with the variation of system pressure and temperature, thus affecting the particle size distributions of DOA.

Key words: solvent deasphalting, supercritical, de-oiled asphalt, particles