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Determination of P-V-T-x properties of the CO2-H2O system up to 573.15 K and 120 MPa-Experiments and model
Hu, Qingcheng1; Guo, Huirong2; Lu, Xinbiao1,3; Lu, Wanjun1; Chen, Ying2,4; Zhu, Yan2; Geng, Lantao1
2016-04-10
Source PublicationCHEMICAL GEOLOGY
Volume424Pages:60-72
AbstractA new method is being developed as part of this study to measure the Pressure-Volume-Temperature-composition (P-V-T-x) properties of the CO2-H2O system at temperatures from 273.15 to 513.15 K and pressures from 30 to 120 MPa. The density of a CO2-H2O solution is determined by measuring the volumetric change of the solution sealed in a capillary High-Pressure Optical Cell (HPOC), through a systematic correction. This study partially fills the current density/molar volume data gap for dilute CO2-H2O systems. Data show that the density of CO2-H2O mixture (rho(CO2-H2O)) changes little below 298.15 K, then decreases more rapidly than rho(H2O) with increasing temperature at constant pressure, and eventually becomes lower than rho(H2O) in high temperature range (for example, above 489 K at 30 MPa). This pivoting temperature (T-p, above which rho(CO2-H2O) becomes lower than rho(H2O)) monotonously increases with increasing pressure (to 575 K as the pressure reaches 120 MPa). The calculated apparent molar volume of CO2 in water (V-Phi,V-CO2) is independent of CO2 concentration, but is negatively correlated to pressure when the temperature is above 298.15 K. A revised V-Phi,V-CO2 model for dilute CO2-H2O systems is proposed based on this study. This revised model can reproduce both the current and previous density data with an acceptable error range at temperatures up to 573.15 K and pressures up to 120 MPa. It can be used reliably to simulate geological sequestration of CO2 into water aquifers, and in the study of P-V-T-x evolution of geo-fluids (e.g., CO(2-)bearing aqueous ore forming fluids). (C) 2016 Elsevier B.V. All rights reserved.
SubtypeArticle
KeywordP-v-t-x Co2-h2o System Measurements Model
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.chemgeo.2016.01.011
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSYNTHETIC FLUID INCLUSIONS ; CARBON-DIOXIDE SEQUESTRATION ; EQUATION-OF-STATE ; PVTX PROPERTIES ; THERMODYNAMIC PROPERTIES ; INFINITE DILUTION ; SALINE FORMATIONS ; AQUEOUS-SOLUTIONS ; CO2 SOLUBILITY ; HIGH-TEMPERATURES
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000370021200005
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/1508
Collection深海科学研究部_深海极端环境模拟研究实验室
Affiliation1.China Univ Geosci, Fac Earth Resources, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
3.China Univ Geosci, Geol Survey Inst, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
Recommended Citation
GB/T 7714
Hu, Qingcheng,Guo, Huirong,Lu, Xinbiao,et al. Determination of P-V-T-x properties of the CO2-H2O system up to 573.15 K and 120 MPa-Experiments and model[J]. CHEMICAL GEOLOGY,2016,424:60-72.
APA Hu, Qingcheng.,Guo, Huirong.,Lu, Xinbiao.,Lu, Wanjun.,Chen, Ying.,...&Geng, Lantao.(2016).Determination of P-V-T-x properties of the CO2-H2O system up to 573.15 K and 120 MPa-Experiments and model.CHEMICAL GEOLOGY,424,60-72.
MLA Hu, Qingcheng,et al."Determination of P-V-T-x properties of the CO2-H2O system up to 573.15 K and 120 MPa-Experiments and model".CHEMICAL GEOLOGY 424(2016):60-72.
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