Excess molar enthalpies for mixtures of supercritical carbon dioxide and water + ethanol solutions

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• 作者：Eduardo Pé ; rez ; Yolanda Sá ; nchez-Vicente ; Albertina Cabañ ; as ; Concepció ; n Pando and Juan A.R. Renuncio
• 关键词：Supercritical carbon dioxide ; Ethanol ; Water ; Mixtures ; Excess molar enthalpies
• 刊名：The Journal of Supercritical Fluids
• 出版年：2005
• 期刊代码：60_08968446
• 类别：ce
• 出版时间：2005
• 卷：36
• 期：1
• 页码：23-30
• 文件大小：287 K

摘要

Excess molar enthalpies (l23">l23&_user=10&_cdi=6149&_rdoc=4&_handle=V-WA-A-W-AU-MsSAYVW-UUW-U-AABZBUWCUY-AABBYYBBUY-CADZZBYUU-AU-U&_acct=C000050221&_version=1&_userid=10&md5=dca35557d313d55e2ad6189b325b9a5c">) for mixtures of supercritical CO₂ and ethanol aqueous solutions were measured at 323.15 K and 7.64 and 15.00 MPa using an isothermal high-pressure flow calorimeter. l24">l24&_user=10&_cdi=6149&_rdoc=4&_handle=V-WA-A-W-AU-MsSAYVW-UUW-U-AABZBUWCUY-AABBYYBBUY-CADZZBYUU-AU-U&_acct=C000050221&_version=1&_userid=10&md5=23208736f13326e500401c8ecf7c6346"> values obtained at the lower pressure are very exothermic while those obtained at the higher pressure are moderately endothermic. l25">l25&_user=10&_cdi=6149&_rdoc=4&_handle=V-WA-A-W-AU-MsSAYVW-UUW-U-AABZBUWCUY-AABBYYBBUY-CADZZBYUU-AU-U&_acct=C000050221&_version=1&_userid=10&md5=75e3af33081611f0a4458fd20593d898"> for CO₂ + H₂O mixtures at 308.15 K and 7.64 MPa and 323.15 K and 15.00 MPa were also measured. These data are examined together with l26">l26&_user=10&_cdi=6149&_rdoc=4&_handle=V-WA-A-W-AU-MsSAYVW-UUW-U-AABZBUWCUY-AABBYYBBUY-CADZZBYUU-AU-U&_acct=C000050221&_version=1&_userid=10&md5=8d9fc0c9a8308a2487583b6b7272228c"> data previously reported for mixtures of supercritical CO₂ and ethanol aqueous solutions, vapor–liquid equilibrium data for the ternary system CO₂ + H₂O + ethanol and the excess enthalpy data for the three related binary systems. CO₂–ethanol interactions are shown to be the main contribution to excess enthalpies when supercritical CO₂ and ethanol aqueous solutions are mixed. Ternary excess enthalpies for CO₂ + H₂O + ethanol are also obtained. Kohler's method is used for estimating these ternary data from the excess enthalpy data of the three related binary systems.