Volumetric properties of carbon dioxide + carbon disulfide at several temperatures up to 120 MPa

L. Lugo1, T. Regueira2, J. Fernandez2, P. Carvalho3 and J. Coutinho3

1Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, Vigo, Spain
2Laboratorio de Propiedades Termofisicas, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
3CICECO, Departamento de Química, Universidade de Aveiro, Aveiro, Portugal

Keywords: CO2, high pressure
property: density
material: carbon dioxide

Carbon dioxide, being easily available at high purity, cheap, non-toxic and non-flammable, is currently considered as an important industrial solvent for many applications. Knowledge about the nature of the interactions between CO2 and different organic molecules is of relevance for designing, operating and optimizing many industrial processes, such as CO2 supercritical fluid extraction, enhanced oil recovery, through CO2 flooding, or CO2 emissions capture, from fossil fuel-fired power plants and other industrial processes. As part of a continuing effort to fully understand the interactions between CO2 and different compounds, the high pressure density CO2 + CS2 binary system was here investigated. The measurements were performed from 298.15 to 333.15 K and up to 120 MPa using a fully automated densimeter Anton Paar HPM. We have used a new loading technique for systems containing two components, which are in different state, liquid and gas, at atmospheric pressure and ambient temperature. Our loading system consists in two syringe ISCO Teledyne pumps model 260D with electronic valves which deliver the gas and the liquid pure compounds at programmable constant flow rates. These pumps are able to work with supercritical fluids because they can be thermostatized and filled under pressure, up to 52 MPa. Moreover, we have placed at the end of the pressure line a pressure limiting valve that keeps constant the pressure at a fixed value. Thus, we can transfer the sample to the measurement system through an isobaric process. The authors are thankful for financial support from Fundação para a Ciência e a Tecnologia (Project PTDC/EQU FTT/102166/2008) and Ph.D. grant (SFRH/BD/41562/2007) of Pedro J. Carvalho. L. L. acknowledges the financial support from the Ramon y Cajal Program. T.R. acknowledges financial support provided by the FPU program.

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