Measurements of HmE and VmE for (n-butane + sulphur hexafluoride) in the supercritical region at the pressure 6.00 MPa |
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| Affiliation: | 1. School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Centre Médical Universitaire (CMU), Rue Michel-Servet 1, 1206 Geneva, Switzerland;2. IRPF, Center of Immunology Pierre Fabre, 5 Avenue Napoléon III, BP 60497, 74160 Saint-Julien-en-Genevois, France;1. Department of Analytical Chemistry, Faculty of Pharmacy, Sivas Cumhuriyet University, 58140, Sivas, Turkey;2. Department of Pharmacy, Vocational School of Health Service, Sivas Cumhuriyet University, 58140, Sivas , Turkey;3. Department of Pharmacy, University of Chieti-Pescara “G. d''Annunzio”, Via dei Vestini 31, 66100, Chieti, Italy;4. Department of Analytical Chemistry, Faculty of Pharmacy, Erciyes University, Kayseri, 38039, Turkey;9. Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th St, Miami, FL 33199, USA |
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| Abstract: | A flow mixing calorimeter followed by a vibrating-tube densimeter has been used to measure excess molar enthalpies HmE and excess molar volumes VmE of {xC4H10+(1−x)SF6}. Measurements over a range of mole fractions x have been made in the supercritical region at the pressure p=6.00 MPa and at seven temperatures in the range T=311.25 K to T=425.55 K. The HmE(x) measurements at T=351.35 K were found to exhibit an unusual double maximum. Measurements at all temperatures are compared with the Patel–Teja equation of state with the parameters determined by solving a cubic equation as recommended, and also with parameters determined by the method suggested by Valderamma and Cisternas who proposed equations which are a function of the critical compression factor. The overall fit to the HmE and VmE measurements obtained using Valderamma and Cisternas equations was found to be better than that obtained using the parameters according to the method suggested by Patel and Teja. |
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