Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 117
Experimental Measurement and Thermodynamic Modeling of Phase Behaviour of Hydrogen Sulphide+Water System at Low Temperatures
Chapoy, A., Valtz, A., Richon, D., Mohammadi, A.H., and Tohidi, B.
The 5th International Conference on Gas Hydrates, Trondheim, Norway, June 13-16 (2005).
Accurate solubility data, especially near the hydrate-stability conditions, are necessary to develop and validate thermodynamic models for vapour-liquid equilibria and hydrate phase behaviour predictions. Data concerning water with most of hydrocarbons at low temperatures (in particular near the hydrate stability zone) are often scarce and dispersed. Typically, reliable waterhydrocarbon mutual solubility data are limited to temperatures above 298 K. Clearly, the binary interaction parameters tuned using these data would have an adverse effect on predicting the mutual solubilities at low temperature conditions. The main objective of this work is to provide the much-needed data at the above-mentioned conditions. Vapour - liquid equilibria have been determined using a static-�analytic apparatus taking advantage of a new sampling device. The Valderrama modification of the Patel-Teja equation of state combined with non-density dependent mixing rules is used to model the fluid phases and represent the experimental data. Only the solubility data generated in this work are used for tuning the binary interaction parameters between hydrogen sulphide and water. The model predictions for water content of the vapour phase and hydrate phase boundary are in good agreement with independent experimental data, demonstrating the reliability of the techniques and model used in this work.

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