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

Content Provider	Springer Nature Link
Author	Mayoufi, Nadia Dalmazzone, Didier Fürst, Walter Elghoul, Leila Seguatni, Adel Delahaye, Anthony Fournaison, Laurence
Copyright Year	2011
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$_{2}$O, 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$_{2}$O.
Starting Page	481
Ending Page	486
Page Count	6
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	109
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Semi-clathrate hydrate CO$_{2}$ Tetra-alkyl ammonium salt Equilibrium Dissociation enthalpy Analytical Chemistry Inorganic Chemistry Measurement Science and Instrumentation Polymer Sciences Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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