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Model for gas hydrate equilibria using a variable reference chemical potential: Part 1
Author(s) -
Lee SangYong,
Holder Gerald D.
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480116
Subject(s) - clathrate hydrate , hydrate , methane , chemistry , dissociation (chemistry) , molecule , thermodynamics , natural gas , lattice (music) , chemical physics , organic chemistry , physics , acoustics
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, Δμ w oand Δh w o , 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 Δμ w oand Δh w ovalues 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 Δμ w oand the molecular size of the guest molecule (or the Kihara hard‐core diameter ‘a’) is also developed for estimating values of Δμ w o , where experimental data are absent (that is, methane in structure II hydrate with no other guests).