An equation of state for solid–liquid–vapor equilibrium applied to gas processing and natural gas liquefaction

Phase equilibrium data for the hydrogen sulphide + methane system at temperatures from 186 to 313 K and pressures up to about 14 MPa

“…Experimentally we did not detect any presence of solid at the lowest studied pressure. SLV-EoS [15,16] for the simultaneous representation of solid, liquid, and vapour phases will be compared to the other models for the representation of experimental data. This equation will be used for the prediction of phase diagrams especially in the solid-fluid equilibrium region (separation of H 2 S from natural gas by solidification process).…”

Phase behavior of system methane + hydrogen sulfide

“…Regressed parameters are Z c , a 0 , a 1 , a 2 , n , b 0 , b 1 , b 2 , m , c , and d for CH 4 and H 2 S are reported in Table . Values for CH 4 are the same presented by Stringari et al, and here reported for the reader convenience.…”

“…for the representation of the phase equilibrium behavior of a pure component requires the previous evaluation of 11 parameters (the critical volume v c or equivalently the critical compressibility coefficient Z c , a 0 , a 1 , a 2 , n , b 0 , b 1 , b 2 , m , c , and d ). The procedure deeply illustrated by Stringari et al has been used to this scope.…”

Identification of the phase of a substance from the derivatives of pressure, volume and temperature, without prior knowledge of saturation properties: Extension to solid phase

“…2. The second approach involves modifying the van der Waals form into a higher-order polynomial form [4,6,8,9] to describe the solid, liquid and vapour phases. Multiple volume roots need to be determined at any given pressure and temperature in this approach.…”