Critical parameters for 2-methylpropane (R600a)

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Measurements of the vapor-liquid coexistence curve near the critical point for 2-methylpropane (isobutane; R600a) were carried out in the reduced temperature range of 0.957 < T/Tc < 1 and in the reduced density range of 0.40 < ρ/ρc < 1.70, and the critical temperature Tc and critical density ρc were determined. The critical pressure Pc was calculated by extrapolating reliable vapor-pressure data in the vicinity of the critical point. The critical parameters determined are Tc = (407.795 ± 0.010) K, ρc = (229 ± 2) kg·m-3, Vc = (253.8 ± 2.2) cm3·mol-1, and Pc = (3628.2 ± 1.4) kPa. In addition, the critical exponent β along the coexistence curve is discussed.

Original languageEnglish
Pages (from-to)406-408
Number of pages3
JournalJournal of Chemical and Engineering Data
Issue number2
Publication statusPublished - Mar 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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