Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N2, CO2, N2 + CO2 and CH4 + CO2 - Archive ouverte HAL Access content directly
Journal Articles Journal of Thermal Analysis and Calorimetry Year : 2009

Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N2, CO2, N2 + CO2 and CH4 + CO2

(1) , (1)
1
Johnny Deschamps
Didier Dalmazzone

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 N2 and CO2 and gases mixtures such as N2 + CO2 and CH4 + CO2 were studied. To our knowledge, we present the first phase diagram of TBAB sc hydrates of N2 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.

Dates and versions

hal-01179655 , version 1 (23-07-2015)

Identifiers

Cite

Johnny Deschamps, Didier Dalmazzone. Dissociation enthalpies and phase equilibrium for TBAB semi-clathrate hydrates of N2, CO2, N2 + CO2 and CH4 + CO2. Journal of Thermal Analysis and Calorimetry, 2009, Special Chapter dedicated to the memory of Dr. Michel Ollivon, 98 (1), pp.113-118. ⟨10.1007/s10973-009-0399-3⟩. ⟨hal-01179655⟩

Collections

ENSTA ENSTA_UCP
64 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More