Thermodynamic properties of a CO2 - Rich mixture (CO2 + CH3OH) in conditions of interest for carbon dioxide capture and storage technology and other applications

Rivas, C. ; Gimeno, B. (Universidad de Zaragoza) ; Bravo, R. ; Artal, M. (Universidad de Zaragoza) ; Fernández, J. (Universidad de Zaragoza) ; Blanco, S. T. (Universidad de Zaragoza) ; Velasco, M. I. (Universidad de Zaragoza)

Resumen: Methanol can be an impurity in transported and stored anthropogenic CO2 in carbon dioxide capture and storage technology; likewise, methanol is one of the most useful CO2 modifiers for supercritical processes. Therefore reliable values of thermodynamic properties of CO2 - rich mixtures CO2 + CH3OH are needed. We measured the following properties of a (CO2 + CH3OH) mixture with xx CO2=0.9700 in dense phase at six temperatures from 263.15 K to 313.15 K:The speed of sound, c, up to 194.49 MPa, using a double-path pulse-echo method at 5 MHz, for which a repeatability study gave an overall standard uncertainty of c, u(c) = 5.9 × 10-4c.The density, ¿, at pressures =20.00 MPa using a vibrating-tube densimeter with a standard uncertainty, u(¿) = 0.4 kg/m-3.Combining our c and ¿ experimental values and the isobaric specific heat capacity, cp, from the GERG equation of state (EoS), we calculated ¿, cp, the volume-dependent solubility parameter, dV, and the Joule-Thomson coefficient, µJT, at pressures =195.0 MPa. We are the first to report the adaptation for compressed gases of a calculation method based on numerical integration previously used only for liquids. The experimental and calculated values were compared with those from the PC-SAFT and GERG EoSs, allowing us to validate both EoSs to represent the experimental properties of the system under most conditions studied and the calculation method up to 195.0 MPa.

Idioma: Inglés

DOI: 10.1016/j.jct.2016.03.026

Año: 2016

Publicado en: JOURNAL OF CHEMICAL THERMODYNAMICS 98 (2016), 272-281
ISSN: 0021-9614

Factor impacto JCR: 2.726 (2016)

Categ. JCR: THERMODYNAMICS rank: 13 / 58 = 0.224 (2016) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 64 / 145 = 0.441 (2016) - Q2 - T2

Factor impacto SCIMAGO: 0.971 - Atomic and Molecular Physics, and Optics (Q1) - Physical and Theoretical Chemistry (Q1) - Materials Science (miscellaneous) (Q1)

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Química Física (Dpto. Química Física)