Experimental study of diffusion of vaporized solvent in bitumen at elevated temperatures

The diffusion coefficient of gaseous solvent in bitumen is an essential parameter in numerical modeling of solvent-assisted thermal recovery processes. The reported measurements of solvent diffusion coefficient are relatively scarce, especially at the high temperature. In this study, a new constant-pressure experimental technique for one-dimensional diffusion tests, which accounts for the bitumen swelling and density change, was developed. A...