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Investigation of thermodynamic properties of the binary system polyethylene glycol/CO2 using new methods |
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| Affiliation: | 1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Key Laboratory of Intergrate Exploration of Baiyun Obo Multi–metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland;2. Radioactivity Environment Remediation (RER) Consultants, Fuchsbauerweg 50, 94036 Passau, Germany;1. Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia;2. Research Center Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, D-01314 Dresden, Germany;3. Institute of Physics, University of Rostock, Universitätsplatz 3, D-18051 Rostock, Germany |
| Abstract: | The solubility and diffusivity of CO2 in polyethylene glycols (PEGs) of different molecular weight measured by two different methods are discussed in the present work. Before solubility measurements, the melting temperatures of PEG with different molecular weights were determined by means of differential scanning calorimetry. For the purpose of the present study a temperature of 343 K was chosen as the working temperature for both employed methods since all studied polymers are in liquid state at this temperature. All samples were analyzed at isothermal conditions and in the pressure range from 0 MPa up to 30.0 MPa. A set of absorption experiments on the PEG/CO2 systems was performed using an external balance method. In order to validate results obtained by the new method they were compared to the data obtained at the same process conditions by a method using magnetic suspension balance (MSB). |
| Keywords: | Phase equilibrium Solubility Diffusion coefficient Magnetic suspension balance |
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