Dependence of volume expansion on alkyl chain length and the existence of branched methyl group of CO2-expanded ketone systems at 40 °c

Tsutomu Aida, Takafumi Aizawa, Mitsuhiro Kanakubo, Hiroshi Nanjo

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalJournal of Supercritical Fluids
Volume55
Issue number1
DOIs
Publication statusPublished - 2010 Nov
Externally publishedYes

Keywords

  • Carbon dioxide
  • Density
  • Expanded liquid
  • Expansion coefficient
  • Ketone
  • Partial molar volume

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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