Isobaric enthalpy increment and isenthalpic Joule–Thomson effect measurements on synthetic gas containing binary, or ternary mixtures of methane, ethane, propane, and nitrogen

Analysis and optimization of two-column cryogenic process for argon recovery from hydrogen-depleted ammonia purge gas

“…For the gaseous enthalpy, Grini et al (Grini et al, 1998) once issued experimental isobaric enthalpy difference for binary mixture nitrogen-methane at 170-260 K and 0.9-7.0 MPa, and simultaneously compared them with those values of SRK equation of state (Soave, 1972) in which the involved ideal gas enthalpy is calculated with API correlation (API, 1983). Their comparison shows that SRK equation can represent the measurements with reasonable accuracy except in the critical region.…”

A Combined Pressure-controlled Scanning Calorimetry and Monte Carlo Determination of the Joule−Thomson Inversion Curve. Application to Methane

“…A feasible operating procedure could consist of producing a throttling expansion in a flow calorimeter. A shortcoming for this technique is that the combined appropriate use of both flow rate and pressure cannot be obtained with a sufficient precision at pressures exceeding 30 MPa . Besides this instrumental limitation, the fundamental reason to refuse this method remains in the JTC value itself.…”

“…A shortcoming for this technique is that the combined appropriate use of both flow rate and pressure cannot be obtained with a sufficient precision at pressures exceeding 30 MPa. 5 Besides this instrumental limitation, the fundamental reason to refuse this method remains in the JTC value itself. Near the inversion zone, the vanishing JTC values imply that even large pressure differences lead to very small thermal effects, which, unfortunately, cannot be detected with reliable accuracy.…”