Mechanistic modelling of non-equilibrium interphase mass transfer during solvent-aided thermal recovery processes of bitumen and heavy oil

•Diffusive interphase mass transfer for bitumen/solvent systems is estimated.•Non-equilibrium interphase mass transfer in solvent-aided process is modelled.•Impact of non-equilibrium interphase mass transfer is studied.•Scaling relation is developed for non-equilibrium interphase mass transfer.