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Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N 2 , CO 2 , N 2 + CO 2 and CH 4 + CO 2

Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N 2 , CO 2 , N... Tetra- n -butyl ammonium bromide (TBAB) semi-clathrate (sc) hydrates of gas are of prime importance in the secondary refrigeration domain and in the separation of gas molecules by molecular size. However, there is a scarcity of dissociation enthalpies under pressure of pure gases and gases mixtures for such systems. In addition, the phase equilibrium of TBAB sc hydrates of several pure gases is not well defined yet as a function of the TBAB concentration and as a function of the pressure. In this paper, dissociation enthalpies and the phase equilibrium of TBAB sc hydrates of gas have been investigated by differential scanning calorimetry (DSC) under pressure. Pure gases such as N 2 and CO 2 and gases mixtures such as N 2 + CO 2 and CH 4 + CO 2 were studied. To our knowledge, we present the first phase diagram of TBAB sc hydrates of N 2 for different pressures of gas in the TBAB concentration range from 0.170 to 0.350 wt. Enthalpies of dissociation of TBAB sc hydrates of pure gases and gases mixtures were determined as a function of the presssure for a compound with a congruent melting point whose hydration number corresponds to 26. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Thermal Analysis and Calorimetry Springer Journals

Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N 2 , CO 2 , N 2 + CO 2 and CH 4 + CO 2

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References (24)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Akadémiai Kiadó, Budapest, Hungary
Subject
Chemistry; Measurement Science and Instrumentation; Inorganic Chemistry ; Polymer Sciences ; Analytical Chemistry ; Physical Chemistry
ISSN
1388-6150
eISSN
1572-8943
DOI
10.1007/s10973-009-0399-3
Publisher site
See Article on Publisher Site

Abstract

Tetra- n -butyl ammonium bromide (TBAB) semi-clathrate (sc) hydrates of gas are of prime importance in the secondary refrigeration domain and in the separation of gas molecules by molecular size. However, there is a scarcity of dissociation enthalpies under pressure of pure gases and gases mixtures for such systems. In addition, the phase equilibrium of TBAB sc hydrates of several pure gases is not well defined yet as a function of the TBAB concentration and as a function of the pressure. In this paper, dissociation enthalpies and the phase equilibrium of TBAB sc hydrates of gas have been investigated by differential scanning calorimetry (DSC) under pressure. Pure gases such as N 2 and CO 2 and gases mixtures such as N 2 + CO 2 and CH 4 + CO 2 were studied. To our knowledge, we present the first phase diagram of TBAB sc hydrates of N 2 for different pressures of gas in the TBAB concentration range from 0.170 to 0.350 wt. Enthalpies of dissociation of TBAB sc hydrates of pure gases and gases mixtures were determined as a function of the presssure for a compound with a congruent melting point whose hydration number corresponds to 26.

Journal

Journal of Thermal Analysis and CalorimetrySpringer Journals

Published: Oct 1, 2009

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