High-Pressure Phase Behavior and Equilibria for Chinese Petroleum Residua and Light Hydrocarbon Systems. Part II

Abstract

Abstract The influence of temperature, pressure, and solvent to oil ratio on phase compositions has been determined in a Hg-free high-pressure PVT instrument by using a whole phase sampling technique. Supercritical fluid extraction and fractionation (SFEF) technology, in combination with SARA analysis, have resolved a key problem, the characterization of heavy oil in the modeling of the phase equilibria of the complex heavy oil and light hydrocarbon systems. Phase equilibria of the heavy oil system can be adequately modeled by the SRK and PR equations of state using a new estimation method for critical properties. This information has been used to establish operational envelopes for conventional solvent deasphalting process (SDA) and a new supercritical solvent-selective separation (SSELS) process.