Author/Authors :
M. A. Nasab Department of Chemical, Oil and Gas Engineering - Shiraz University of Technology, Shiraz, Iran , J. Javanmardi Department of Chemical, Oil and Gas Engineering - Shiraz University of Technology, Shiraz, Iran
كليدواژه :
Structure H , Methane , Hydrate , Equation of State
چكيده لاتين :
In this work, the modelling of hydrate dissociation temperatures of structure H methane hydrate in the presence of Methylcyclopentane and 1, 2-cis-Dimethylcyclohexane using CPA and SRK EoS have been discussed. The van der Waals-Platteeuw, vdWP, solid solution theory is used to estimate the hydrate dissociation temperature. The Cubic-Plus-Association, CPA, and Soave-Redlich-Kwong, SRK, equation of states, EoS, with the Huran-Vidal, HV, mixing rule have been used to perform the flash calculation and estimate the vapour and liquid phases compositions. The excess Gibbs free energy of the mixture is calculated using the UNIFAC activity model. Based on these equations, the available experimental data of hydrate dissociation points of methane+ methylcyclopentane and methane+1,2-cis-dimethylcyclohexane hydrate are predicted. The results show that average absolute deviation, AAD, between calculated and experimental temperatures for methane+ methylcyclopentane system is 0.24 K and 0.25 K for SRK and CPA EoS, respectively, and for the methane+1,2-cis-dimethylcyclohexane system is 0.25 K and 0.28 K for SRK and CPA EoS, respectively.
