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Titolo:
Resolving apparent contradictions in equilibrium measurements for clathrate hydrates in porous media
Autore:
Wilder, JW; Seshadri, K; Smith, DH;
Indirizzi:
US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA US DOE Morgantown WV USA 26507 ergy Technol Lab, Morgantown, WV 26507 USA Parsons Infrastruct & Technol Grp, Morgantown, WV 26505 USA Parsons Infrastruct & Technol Grp Morgantown WV USA 26505 n, WV 26505 USA W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 pt Phys, Morgantown, WV 26506 USA W Virginia Univ, Dept Math, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 pt Math, Morgantown, WV 26506 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 41, volume: 105, anno: 2001,
pagine: 9970 - 9972
SICI:
1520-6106(20011018)105:41<9970:RACIEM>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMODYNAMIC PROPERTIES; DISSOCIATION; METHANE; PORES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, DH US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA US DOE Morgantown WV USA 26507 ol Lab, Morgantown, WV 26507 USA
Citazione:
J.W. Wilder et al., "Resolving apparent contradictions in equilibrium measurements for clathrate hydrates in porous media", J PHYS CH B, 105(41), 2001, pp. 9970-9972

Abstract

A conceptual model for hydrate equilibrium in media with broad pore-size distributions is used to interpret methane hydrate equilibrium experiments in silica gel pores with nominal radii of 2, 5, and 7.5 nm, While the hydrate equilibrium pressure is an intensive property, it is demonstrated that the presence of a broad pore-size distribution in a porous medium causes the experimental pressures to appear extensive. It is observed that the sample size, the headspace volume, the temperature at which the experiments are started, and the amount of hydrate allowed to dissociate to establish equilibrium at this initial temperature all affect the observed pressure at any given temperature. The pore-volume distribution of the porous medium (not thenominal pore radius) and the percent conversion of pore-water to hydrate also affect the measured equilibrium pressures. As a result, measured equilibrium pressures at a specific temperature for identical media can be significantly different, while those for different media may be superposed. Theseseeming inconsistencies, their causes, and interpretations are examined and explained. Apparently fundamental problem,,; in experimental data are removed when the number of degrees of freedom is properly included in the interpretation.

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Documento generato il 06/04/20 alle ore 07:20:27