Phase boundary measurement on a methane plus decane plus multiparaffins system

Phase boundaries between homogeneous liquid phase and two-phase regions, both liquid-vapour and liquid-solid, and the phase boundary between the two-phase liquid - vapour region and the three-phase liquid - vapour - solid region were experimentally determined under pressure on the system methane + decane + heavy fraction using a full visibility sapphire cell. Measurements were performed on different mixtures made up of 90% of the binary mixture methane + decane (with a molar fraction of methane of about 50%) and 10% of a heavy fraction composed of various distributions of heavy normal paraffins centered around C-22. The liquid-solid phase transition was investigated up to 45 MPa and fluid phase boundary was studied in the temperature domain from 293 K to 423 K.