Ks. Pedersen et al., PHASE-EQUILIBRIUM CALCULATIONS FOR UNPROCESSED WELL STREAMS CONTAINING HYDRATE INHIBITORS, Fluid phase equilibria, 126(1), 1996, pp. 13-28
It is shown that the phase distribution of methanol and water between
a hydrocarbon gas phase, a hydrocarbon liquid phase and an aqueous pha
se can be represented using the Soave-Redlich-Kwong equation with a no
n-conventional mixing rule for the a-parameter suggested by Huron and
Vidal. Model parameters are estimated from data for binaries of the ty
pe methanol-hydrocarbon and water-hydrocarbon. New experimental data a
re presented for two reservoir fluids and for one model system. The pa
per further presents a phase equilibrium algorithm for calculating the
phase boundaries and the equilibrium compositions at the phase bounda
ry for a system consisting of a gas, a liquid and a mixed aqueous phas
e.