Model for gas hydrate equilibria using a variable reference chemical potential: Part 1

Sang Yong Lee, Gerald D. Holder

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

A new model developed for predicting the dissociation pressure of gas hydrates proposes that the host - host interaction can be affected by the guest molecules, thus requiring different values of the reference properties, Δμwo, and Δμwo, for each gas hydrate. We presume that the primary impact of the guest is to distort the lattice, although other factors, such as guest polarity, can have an impact. Experimentally based Δμwo and Δhwo values for each gas hydrate show that these values vary from guest to guest, generally increasing with guest size. Using these experimentally determined reference values, the error between calculated and experimental dissociation pressures is reduced. A correlation between Δμwo and the molecular size of the guest molecule (or the Kihara hardcore diameter 'a') is also developed for estimating values of Δμwo, where experimental data are absent (that is, methane in structure H hydrate with no other guests).

Original languageEnglish
Pages (from-to)161-167
Number of pages7
JournalAIChE Journal
Volume48
Issue number1
DOIs
StatePublished - Jan 2002

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