Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 033
Vapour-Hydrate Equilibrium Ratio Charts for Heavy Hydrocarbon Compounds, Part-1 Structure-II Hydrates: Benzene, Cyclopentane, Cyclohexane and Neopentane
Tohidi, B., Danesh, A, Tabatabaei, A.R., and Todd, A. C.
Industrial & Engineering Chemistry Research, 36(7), 2871-2874 (1997).
The most successful empirical method for predicting hydrate-phase equilibrium in water-hydrocarbon system is based upon vapor-solid equilibrium ratio (Kvs values) correlations. Equilibrium ratio charts for known hydrate formers, with n-butane as the heaviest compound, are available in the literature. With the discovery of heavier hydrate-forming compounds, their equilibrium ratio charts are required for reliable prediction of the hydrate-free zone of hydrocarbon mixtures, particularly reservoir fluids. In this work, as in-house thermodynamic model, validated against experimental hydrate equilibrium data of four structure-II heavy hydrate formers (HHF), benzene, cyclopentane, cyclohexane, and neopentane, has been used for generating their Kvs value charts. The resulting Kvs values have been used in predicting a hydrate-free zone of binary and ternary mixtures of HHF with methane and/or nitrogen, demonstrating success when compared with experimental data.

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