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Indexed by:期刊论文

Date of Publication:2018-01-01

Journal:COMPUTATIONAL AND THEORETICAL CHEMISTRY

Included Journals:SCIE

Volume:1123

Page Number:79-86

ISSN No.:2210-271X

Key Words:Propane hydrate; Decomposition; Methanol; Molecular dynamics

Abstract:Employing NPT molecular dynamics method with consistent valence force field, dissociation processes of propane hydrate with and without methanol additive are simulated at different temperatures and a constant pressure of 50 MPa. We analyze structural snapshots, radial distribution functions, density distributions, angle distributions, change of energies, mean square displacements and diffusion coefficients of two comparative models and find that encaging methanol molecules in the 5(12) cavities could enhance the diffusion behaviors of H2O and C3H8 molecules and shorten the decomposition time of propane hydrate. The hydroxyl group of methanol could form hydrogen bonds with the water cage skeleton, and destroy the original hydrogen bond balance of the hydrate simultaneously. Our theoretical results could provide a useful guideline to understand gas hydrate blocking wellbore in the production and transportation of oil and gas. (C) 2017 Elsevier B.V. All rights reserved.