Add time:07/18/2019         Source:sciencedirect.com

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.

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