Formation of the Physical Neophase in Terms of SARA Compositions of Vacuum Residua

摘要

Real-time optical microscopy monitoring of the physical progress of the thermal reaction systems of vacuum residual derived from three representative Chinese petroleum, Daqing, Shengli and Gudao crudes has demonstrated that three different kinds of neophases occur sequentially as the residence time extends. These neophases distinguish themselves by their morphology, onset point and bulk effect (1). In terms of solubility, all of them are mainly of n-heptane insolubles and toluene solubles (2). With the further disclosure of the relevance of coke formation to the nascence of the neophases, it is demonstrated that the induction period of coke formation and the morphological compositions of coke are closely related to the three characteristics of neophase formation mentioned above (3).