Phase behavior of simple tributylphosphine oxide (TBPO) and mixed gas (CO2, CH4 and CO2 + CH4)+TBPO semiclathrate hydrates - ENSTA Paris - École nationale supérieure de techniques avancées Paris Access content directly
Journal Articles Journal of Chemical Thermodynamics Year : 2016

Phase behavior of simple tributylphosphine oxide (TBPO) and mixed gas (CO2, CH4 and CO2 + CH4)+TBPO semiclathrate hydrates

Abstract

In this research, new experimental data of hydrate equilibrium conditions were measured for the following systems: tributylphosphine oxide (TBPO) + water; TBPO + CO2 + water; TBPO + CH4 + water; TBPO + CO2 + CH4 + water. The gas mixture CO2 + CH4 had a composition of 40 mol% of CO2 in order to simulate a typical biogas produced by an anaerobic digestion of agricultural waste. Differential scanning calorimetry (DSC) method was applied to measure the dissociation temperatures for each system. The dissociation enthalpy per mole of gas was estimated using Clausius-Clapeyron approximation. For the binary system, the mass fraction of TBPO in aqueous solution varied from 0.05 to 0.40 and the phase transition temperature varied from 278.1 K to 281.0 K. For the ternary systems the measurements were carried out for a mass fraction of TBPO varying from 0.05 to 0.30 in the gas pressure range of 1–3 MPa. The measured dissociation temperatures varied from 284.4 K to 292.5 K. The results showed that the presence of TBPO reduces the gas pressure for hydrate phase formation compared to the binary systems (gas + water). The higher dissociation temperature of TBPO/CH4 semi-clathrate, compared to TBPO/CO2 semi-clathrate, was confirmed. The phase behavior diagram of the binary and the ternary systems were also determined, which would be of interest to determine the operating conditions of potential industrial processes involving hydrate formation, such as gas storage or gas separation.
Not file

Dates and versions

hal-01348874 , version 1 (26-07-2016)

Identifiers

Cite

Luiz Paulo Sales Silva, Didier Dalmazzone, Moncef Stambouli, Philippe Arpentinier, Antonio Trueba, et al.. Phase behavior of simple tributylphosphine oxide (TBPO) and mixed gas (CO2, CH4 and CO2 + CH4)+TBPO semiclathrate hydrates. Journal of Chemical Thermodynamics, 2016, 102, pp.293-302. ⟨10.1016/j.jct.2016.07.022⟩. ⟨hal-01348874⟩
41 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More