Measurement and modeling of the phase behavior of the (carbon dioxide + water) mixture at temperatures from 298.15 K to 448.15 K |
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| Affiliation: | 1. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes veg 1B, NO-7491 Trondheim, Norway;2. SINTEF Energy Research, Trondheim, Norway;3. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway;1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;1. Department of Offshore Oil and Gas Engineering, College of Petroleum Engineering, China University of Petroleum (Beijing), 18 Fuxue Rd. Changping, Beijing, 102249, China;2. 207 Hosler Building, John and Willie Leone Family Department of Energy and Mineral Engineering, Department of Material Sciences and Engineering, EMS Energy Institute, The Pennsylvania State University, University Park, 16802, USA;1. The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, PR China;2. Petroleum Engineer College, Yangtze University, Jingzhou 434023, PR China;1. School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;2. Department of Chemical and Environmental Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;3. Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, 199 Talking East Road, Ningbo 315100, China;1. Methane Hydrate Research Centre, National Institute of Advanced Industrial and Science Technology (AIST), 14-1 Onogawa, Tsukuba 305-8569, Japan;2. Department of Mechanical Systems Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0311, Japan;3. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan |
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| Abstract: | An analytical apparatus has been designed to study the phase behavior of fluid mixtures of relevance to CO2-enhanced oil recovery and carbon dioxide storage in deep aquifers or depleted oil fields. The fluid phases are circulated by means of a dual-channel magnetically-coupled pump and aliquots may be withdrawn from the re-circulation loops, by means of high-pressure sampling valves, for analysis by gas chromatography. The high-pressure cell is fitted with a special probe that may be rotated in order to draw liquid into the re-circulation loop from different heights within the cell, thereby permitting the study of three-phase vapor–liquid–liquid equilibria. The working temperature range of the apparatus is from (298 to 448) K and the maximum working pressure is 50 MPa.In this work, measurements have been made on the binary system (CO2 + H2O) at temperatures from (298.15 to 448.15) K and pressure from (1.5 to 18.0) MPa, and the results are compared with the available literature data. Vapor–liquid–liquid and liquid–liquid equilibrium points were also measured at T = 298.15 K. Standard uncertainties were 0.04 K for temperature, 0.04% of reading for pressure, and typically 3 × 10−4 and 8 × 10−4 for the mole fractions in liquid and vapor phases respectively. The results have been correlated by means of an asymmetric approach based on the Peng–Robinson equation of state, for the vapor phase, and an extended form of Henry's law incorporating the NRTL solution model, for the aqueous liquid-phase. The ability of the Krichevsky–Kasarnovsky (KK) approach to correlate the data has also been evaluated. |
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