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Titolo:
Measurements of equilibrium pressures and temperatures for propane hydratein silica gels with different pore-size distributions
Autore:
Seshadri, K; Wilder, JW; Smith, DH;
Indirizzi:
US Dept Energy, Natl Energy Technol Lab, Morgantown, WV 26507 USA US Dept Energy Morgantown WV USA 26507 hnol 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 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: 13, volume: 105, anno: 2001,
pagine: 2627 - 2631
SICI:
1520-6106(20010405)105:13<2627:MOEPAT>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMODYNAMIC PROPERTIES; HEAT-CAPACITIES; DISSOCIATION; METHANE; ENTHALPIES; 270-K;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, DH US Dept Energy, Natl Energy Technol Lab, Morgantown, WV 26507 USA US Dept Energy Morgantown WV USA 26507 Morgantown, WV 26507 USA
Citazione:
K. Seshadri et al., "Measurements of equilibrium pressures and temperatures for propane hydratein silica gels with different pore-size distributions", J PHYS CH B, 105(13), 2001, pp. 2627-2631

Abstract

Equilibrium pressures for the dissociation of propane hydrate confined in silica gel pores of nominal radii 7.5, 5.0, 3.0, and, 2.0 nm were measured across a wide temperature range, and were higher than those for bulk propane hydrate. The upward shift from the bulk pressures, which depended on the pore size, was 200-300% for the smallest pore size. In each of the pressure-temperature profiles, the temperature at which the four phases (hydrate, ice, liquid water, and gas) apparently coexisted was identified, and this temperature was a linear function of the reciprocal pore size. The enthalpy of dissociation for the equilibrium involving hydrate, liquid water, and gaswas estimated from the data. The change with pore size in this apparent enthalpy appeared to be analogous to the variation in the heat of melting of pore ice as sometimes reported.

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Documento generato il 02/06/20 alle ore 02:01:25