Calorimetric Measurements and Solid-Fluid Phase Equilibria of High Pressure Hydrocarbon Mixtures

Thermophysical property data for hydrocarbon mixtures emulating natural gas is essential in the design and operation of LNG plant equipment. A differential scanning calorimeter was utilised to measure the melting temperatures and isobaric heat capacities of hydrocarbon mixtures at pressures up to 35 MPa and temperatures down to 150 K. The results were benchmarked against the current state-of-the-art models revealing their limited accuracy in predicting these properties and a need to improve model performance. Improvements in predicting melting temperatures were achieved through model regression to the data, with the most notable deviation reduction being from (39.2 to 0.9) K.