Abstract: Considering the design features of solvent deasphalting unit, a series of technical innovations was carried out on the pentane deasphalting unit, including optimization of supercritical system pressure control, tray modification of stripping tower, adding heating system at the bottom of stripping tower, using heat-conducting oil to heat the asphalt system and so on. After revamping, this first domestic pentane solvent deasphalting industrial unit started up successfully, the supercritical recovery rate of pentane was 88.05%, the oil content of solvent was 0.48% and the loss of solvent was only 0.04%.

Key words: supercritical recovery, pentane, technical revamping , solvent deasphalting