Thermodynamic consistency test for experimental data of water content of methane

Abstract

Accurate knowledge of the water content of natural gases is an important factor to estimate the gas hydrate, ice, and condensed water formation conditions. However, the experimental data regarding the water content of gases in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region) are limited. This is partly because of the fact that concentration of water in the gaseous phase in equilibrium with gas hydrate, ice or liquid water (near gas hydrate or ice formation region) is very low considering that reaching the equilibrium conditions near and inside gas hydrate or ice formation region is time consuming process. The measurement difficulties may consequently result in generating unreliable experimental data. This work aims at performing a thermodynamic consistency test based on area approach to study the reliability of some experimental data reported in the literature on the water content of methane (the main component of natural gases) in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region). A discussion is made on the studied experimental data according to the performed consistency test.

A thermodynamic consistency test for experimental isobaric data of wax solubility in gaseous systems

“…The error propagation method [15] has been used for the evaluation of the boundaries for these deviations at constant pressure. Considering mole fraction of wax in the gas phase as the independent measured variable and A f as the dependent measured variable, the error in the calculated areas, E A , and the percent error, %E A can be obtained using following equations [16,17]:…”

Thermodynamic Consistency Test for Experimental Hydrogen Solubility Data in Alkenes

“…Eslamimanesh et al also used this method to study the thermodynamic consistency of experimental data for water content of methane, the amount of sulfur with hydrogen sulfide, the solubility of carbon dioxide and methane in water inside and outside the hydrate formation region, and the phase behavior of supercritical carbon dioxide and ionic liquids . Mohammadi et al used the same method to study the thermodynamic consistency of experimental data on the solubility of wax in the gas phase and the glycol loss in a gaseous system .…”

Development of corresponding states model for estimation of the surface tension of chemical compounds

“…This can be expected by the corresponding experimental measurements of such properties (beside the integrity of the processes' design), which are obtained through accurate experimental procedures/techniques and apparatuses in modern laboratories. However, the broad experimental efforts, since the past two centuries, indicate that generating these kinds of data are intrinsically time‐consuming, costly, and with probable non‐negligible uncertainties mainly due to very high (or very low) temperature/pressure conditions, extremely low compositions of a particular species in the mixtures, inappropriate design of the apparatuses, unreliable experimental techniques, human mistakes during the measurements, carelessness in calibration of the instruments, and so forth …”