Characterization Index for Vacuum Residua and Their Subfractions

摘要

Supercritical fluid extraction and fractionation (SFEF) has been developed to separate eight Chinese and Mideast petroleum vacuum residua. Elemental analysis, average molecular weight, and SAR( saturates, aromatics, resins, and asphaltenes) determinations were performed on the vacuum resindua and their subfractions. Based on an analysis of the collected data, a characteristic index, K_H, consisting of H/C ratio, molecular weight, and density is developed, The index is used ot correlateproperties such as carbon residue and sawturates percentawges. The reference data on thermal cracking, caalytic cracking, and heavy oil pyrolysis proved the validity of the new index. Thus, the K_H index is useful in the classification and evaluation of heavy oil and has the potential for extended application.