Measurement and correlation of the equilibrium liquid and vapour densities and the vapour pressure along the coexistence curve of methane

Solubility isotope effects in aqueous solutions of methane

“…The fact that the partial molar volume at infinite dilution of methane in water at 298 K and the molar volume of pure methane around 90 K are comparable ͑around 37 and 36 cm 3 mol Ϫ1 , respectively͒ 25,26 indicates that the size of the ''solvent cell'' experienced by a methane molecule is similar in both situations. If it is assumed that the interactions between the methane molecule and its surroundings are also alike ͑mainly London dispersion forces͒ then the frequency values observed in liquid methane around 90 K must be comparable with the ones characteristic of methane in the aqueous solutions at 298 K. This ''similar solvent cell'' assumption finds a semiquantitative justification not only in the partial molar volume data but also in the simulation results discussed in the previous section.…”

Sorption Characteristics of CO<sub>2</sub> on Rocks and Minerals in Storing CO<sub>2</sub> Processes

“…The magnetic suspension balance (MSB) from Rubotherm Präzisionsmesstechnik GmbH [18] rated at 350˚C and 35 MPa was used to measure the CO 2 sorption capacity of rocks and minerals, as illustrated in Figure 2. The MSB consisted of a sorption chamber that was used to expose the sample to CO 2 at elevated temperatures and pressures, and microbalance, which was isolated from the sample and existed at ambient conditions.…”

Review on Natural Gas Thermopysical Property Measurement Techniques

“…In such densimeters, several corrections are necessary to reduce the effect of surface tension between the sample liquid and the immersed part of the wire, and the effect of the buoyant force of air on the masses of the analytical balance. Zero shift of balance readings, buoyancy forces on auxiliary devices, adsorption effects and surface tension may reduce the accuracy of such measurements [20].…”

“…The novelty of the magnetic suspension coupling was that it used non-physical-contact force transmission between the sinker in the pressurized cell and the weighing balance at atmospheric pressure, thus allowing a cell design that covered a very wide temperature and pressure range [21]. Then, Kleinrahm and Wagner [20] modified the hydrostatic buoyancy force method by introducing an alternative force transmission method in which they levitated two sinkers through a magnetic suspension coupling. By compensation for surface tension, buoyancy, adsorption effects and shifts in zero-point of the balance, a two-sinker MSD improved the accuracy of the density measurements.…”