Phase behaviour of tri-n-butylmethylammonium chloride hydrates in the presence of carbon dioxide

Nadia Mayoufi; Didier Dalmazzone; Walter Fürst; Leila Elghoul; Adel Seguatni; Anthony Delahaye; Laurence Fournaison

doi:10.1007/s10973-011-1301-7

Phase behaviour of tri-n-butylmethylammonium chloride hydrates in the presence of carbon dioxide

Nadia Mayoufi
, Didier Dalmazzone
, Walter Fürst
, Leila Elghoul
, Adel Seguatni
, Anthony Delahaye
, Laurence Fournaison

AgroParisTech INRA

Research output: Contribution to journal › Article › peer-review

Abstract

The phase behaviour of the system water-tri-n-butylmethylammonium chloride (TBMAC)-CO ₂ was investigated by pressure-controlled differential scanning calorimetry in the range 0-10 mol% TBMAC in water and at CO ₂ pressures ranging from 0 to 1.5 MPa. In the absence of CO ₂, an incongruent melting hydrate, which estimated composition corresponds to TBMAC•30H ₂O, crystallizes at temperatures below -13.6 °C and forms with ice a peritectic phase at approximately 3.9 mol% TBMAC. In the presence of CO ₂ at pressures as low as 0.5 MPa, curves evidenced the presence of an additional phase exhibiting congruent melting at temperatures that are strongly pressure dependent and significantly higher than those of hydrates obtained without CO ₂. This new phase, whose enthalpy of dissociation and CO ₂ content increase slightly with CO ₂ pressure, was identified as a mixed semi-clathrate hydrate of TBMAC and CO ₂ of general formula: (TBMAC + xCO ₂)•30H ₂O.

Original language	English
Pages (from-to)	481-486
Number of pages	6
Journal	Journal of Thermal Analysis and Calorimetry
Volume	109
Issue number	1
DOIs	https://doi.org/10.1007/s10973-011-1301-7
Publication status	Published - 1 Jul 2012

Keywords

CO
Dissociation enthalpy
Equilibrium
Semi-clathrate hydrate
Tetra-alkyl ammonium salt

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10.1007/s10973-011-1301-7

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title = "Phase behaviour of tri-n-butylmethylammonium chloride hydrates in the presence of carbon dioxide",

abstract = "The phase behaviour of the system water-tri-n-butylmethylammonium chloride (TBMAC)-CO 2 was investigated by pressure-controlled differential scanning calorimetry in the range 0-10 mol\% TBMAC in water and at CO 2 pressures ranging from 0 to 1.5 MPa. In the absence of CO 2, an incongruent melting hydrate, which estimated composition corresponds to TBMAC•30H 2O, crystallizes at temperatures below -13.6 °C and forms with ice a peritectic phase at approximately 3.9 mol\% TBMAC. In the presence of CO 2 at pressures as low as 0.5 MPa, curves evidenced the presence of an additional phase exhibiting congruent melting at temperatures that are strongly pressure dependent and significantly higher than those of hydrates obtained without CO 2. This new phase, whose enthalpy of dissociation and CO 2 content increase slightly with CO 2 pressure, was identified as a mixed semi-clathrate hydrate of TBMAC and CO 2 of general formula: (TBMAC + xCO 2)•30H 2O.",

keywords = "CO, Dissociation enthalpy, Equilibrium, Semi-clathrate hydrate, Tetra-alkyl ammonium salt",

author = "Nadia Mayoufi and Didier Dalmazzone and Walter F{\"u}rst and Leila Elghoul and Adel Seguatni and Anthony Delahaye and Laurence Fournaison",

year = "2012",

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doi = "10.1007/s10973-011-1301-7",

language = "English",

volume = "109",

pages = "481--486",

journal = "Journal of Thermal Analysis and Calorimetry",

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TY - JOUR

T1 - Phase behaviour of tri-n-butylmethylammonium chloride hydrates in the presence of carbon dioxide

AU - Mayoufi, Nadia

AU - Dalmazzone, Didier

AU - Fürst, Walter

AU - Elghoul, Leila

AU - Seguatni, Adel

AU - Delahaye, Anthony

AU - Fournaison, Laurence

PY - 2012/7/1

Y1 - 2012/7/1

N2 - The phase behaviour of the system water-tri-n-butylmethylammonium chloride (TBMAC)-CO 2 was investigated by pressure-controlled differential scanning calorimetry in the range 0-10 mol% TBMAC in water and at CO 2 pressures ranging from 0 to 1.5 MPa. In the absence of CO 2, an incongruent melting hydrate, which estimated composition corresponds to TBMAC•30H 2O, crystallizes at temperatures below -13.6 °C and forms with ice a peritectic phase at approximately 3.9 mol% TBMAC. In the presence of CO 2 at pressures as low as 0.5 MPa, curves evidenced the presence of an additional phase exhibiting congruent melting at temperatures that are strongly pressure dependent and significantly higher than those of hydrates obtained without CO 2. This new phase, whose enthalpy of dissociation and CO 2 content increase slightly with CO 2 pressure, was identified as a mixed semi-clathrate hydrate of TBMAC and CO 2 of general formula: (TBMAC + xCO 2)•30H 2O.

AB - The phase behaviour of the system water-tri-n-butylmethylammonium chloride (TBMAC)-CO 2 was investigated by pressure-controlled differential scanning calorimetry in the range 0-10 mol% TBMAC in water and at CO 2 pressures ranging from 0 to 1.5 MPa. In the absence of CO 2, an incongruent melting hydrate, which estimated composition corresponds to TBMAC•30H 2O, crystallizes at temperatures below -13.6 °C and forms with ice a peritectic phase at approximately 3.9 mol% TBMAC. In the presence of CO 2 at pressures as low as 0.5 MPa, curves evidenced the presence of an additional phase exhibiting congruent melting at temperatures that are strongly pressure dependent and significantly higher than those of hydrates obtained without CO 2. This new phase, whose enthalpy of dissociation and CO 2 content increase slightly with CO 2 pressure, was identified as a mixed semi-clathrate hydrate of TBMAC and CO 2 of general formula: (TBMAC + xCO 2)•30H 2O.

KW - CO

KW - Dissociation enthalpy

KW - Equilibrium

KW - Semi-clathrate hydrate

KW - Tetra-alkyl ammonium salt

UR - https://www.scopus.com/pages/publications/84862154574

U2 - 10.1007/s10973-011-1301-7

DO - 10.1007/s10973-011-1301-7

M3 - Article

AN - SCOPUS:84862154574

SN - 1388-6150

VL - 109

SP - 481

EP - 486

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

IS - 1

ER -

Phase behaviour of tri-n-butylmethylammonium chloride hydrates in the presence of carbon dioxide

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Keywords

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