Phase equilibrium for ozone-containing hydrates formed from an (ozone + oxygen) gas mixture coexisting with gaseous carbon dioxide and liquid water |
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| Institution: | 1. College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, PR China;2. Chinese Academy of Inspection and Quarantine, Beijing, 100176, PR China;3. Huangshan Entry-Exit Inspection and Quarantine Bureau, Huangshan, 230022, PR China;1. School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenhe District, Shenyang, 110016, China;2. School of Pharmacy, Jilin Medical College, 5 Jilin Street, Fengman District, Jilin, 132013, China;1. Federal Agency for the Safety of the Food Chain, Directorate General Laboratories, Kruidtuinlaan 55, B-1000 Brussels, Belgium;2. Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium;3. LUNAM Université, Oniris, Laboratoire d’Etude des Résidus et Contaminants dans les Aliments (LABERCA), F-44307 Nantes, France;1. Department of Pharmacology and New Drug Development Institute, Medical School, Chonbuk National University, Jeonju, Chonbuk 561-756, Republic of Korea;2. Clinical Trial Center for Functional Foods (CTCF2), Chonbuk National University Hospital, Jeonju, Chonbuk 561-712, Republic of Korea;3. Functional Food Center at Chonbuk National University, Jeonju, Chonbuk, 561-756, Republic of Korea;4. Buan Agricultural Development & Technology Center, Buan-gun, Jeonbuk, 579-833, Republic of Korea |
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| Abstract: | The paper reports the three-phase (gas + aqueous liquid + hydrate) equilibrium pressure (p) versus temperature (T) data for a (O3 + O2 + CO2 + H2O) system and, for comparison, corresponding data for a (O2 + CO2 + H2O) system for the first time. These data cover the temperature range from (272 to 279) K, corresponding to pressures up to 4 MPa, for each of the three different (O3 + O2)-to-CO2 or O2-to-CO2 mole ratios in the gas phase, which are approximately 1:9, 2:8, and 3:7, respectively. The mole fraction of ozone in the gas phase of the (O3 + O2 + CO2 + H2O) system was from ～0.004 to ～0.02. The modified pressure-search method, developed in our previous study S. Muromachi, T. Nakajima, R. Ohmura, Y.H. Mori, Fluid Phase Equilib. 305 (2011) 145–151] for p–T measurements in the presence of chemically unstable ozone, was applied, having been further modified for dealing with highly water-soluble CO2, for the (O3 + O2 + CO2 + H2O) system, while the conventional temperature-search method was used for the (O2 + CO2 + H2O) system. The measurement uncertainties (with 95% coverage) were ±0.11 K for T, ±6.0 kPa for p, and ±0.0015 for the mole fraction of each species in the gas phase. It was confirmed that, at a given CO2 fraction in the gas phase, p for the (O3 + O2 + CO2 + H2O) system was consistently lower than that for the (O2 + CO2 + H2O) system over the entire T range of the present measurements, indicating a preference of O3 to O2 in the uptake of guest-gas molecules into the cages of a structure I hydrate. |
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