Dependence of volume expansion on alkyl chain length and the existence of branched methyl group of CO2-expanded ketone systems at 40 °C |
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Authors: | Tsutomu Aida Mitsuhiro Kanakubo Hiroshi Nanjo |
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Affiliation: | National Institute of Advanced Industrial Science and Technology, Research Center for Compact Chemical System, 4-2-1 Nigatake, Miyagino-ku, Sendai 983-8551, Japan |
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Abstract: | We measured the density and liquid-phase CO2 mole fraction of CO2-expanded ketones (acetone, methyl ethyl ketone, methyl propyl ketone, methyl butyl ketone, methyl i-propyl ketone, and t-methyl butyl ketone) at 40 °C and evaluated the expansion coefficient on the basis of the experimental results. Volume expansion was slow in the region of a low carbon dioxide mole fraction (<0.7) but rapid in the region of a high carbon dioxide mole fraction (>0.7). The dependence of the expansion coefficient on the carbon dioxide mole fraction could be attributed to the number of molecules in a certain volume. These phenomena were inferred from the partial molar volume estimated using the Peng-Robinson equation of state (PR-EOS). |
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Keywords: | Expanded liquid Carbon dioxide Ketone Density Expansion coefficient Partial molar volume |
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