Journal of Chemical Thermodynamics, Vol.125, 64-70, 2018
Phase stability conditions of clathrate hydrates in the (methane+3-methyl-1-butanol + water), ( methane+3,3-dimethyl-2-butanone + water) and ( methane+2,3-dimethyl-2-butene + water) systems: Experimental measurements and thermodynamic modeling
In this communication, hydrate dissociation data for methane + three liquid hydrocarbons namely 3-methyl-1-butanol, 3,3-dimethyl-2-butanone and 2,3-dimethyl-2-butene are reported. An isochoric pressure-search method was employed to generate the four-phase equilibrium data in the diverse pressure ranges (2.43-8.23 MPa, 1.73-7.56 MPa, and 2.81-7.05 MPa), respectively. The corresponding temperature ranges are (274.3-284.3 K, 277.1-288.9 K and 274.4-283.3 K), respectively. The obtained results in comparison with methane hydrate dissociation data indicate that at a given pressure, the hydrate dissociation temperature in the system consisting of methane + 3-methyl-1-butanol + water roughly equals to those in the system with methane hydrate. Although four phase hydrate dissociation data of methane + 2,3-dimethyl-2-butene + water system has not been determined to exhibit promotion effect, the reduction of hydrate dissociation pressure was observed in the methane + 3,3-dimethyl-2-butanone + water system. Furthermore, estimation of hydrate dissociation conditions of the aforementioned systems has been done by applying the van der Waals-Platteeuw type thermodynamic model and a good agreement is observed. (C) 2018 Elsevier Ltd.