Abstract: The process flowsheets and technical features of the core equipment of two different propane deasphalting units of a petrochemical company.were analyzed and compared in terms of DAO yield and its quality under the conditions of the same feed and solvent. No large difference in properties of DAOs was found for the two devices. However, the temperature at the top of the extractor and solvent-oil ratio are all needed to be adjusted to get good balance of quality and yield. On the other aspect, the commercial results indicate that the device adopting ROSE technology from US KBR Company has a higher yield, as the ROSE technology uses high efficiency structured packing components, two stage process and larger solvent to oil ratio.