Measurements of the Vapor-Liquid Coexistence Curve for the Binary R12 + R22 System in the Critical Region

Yuklhlro Higashi, Shlro Okazaki, Yoshinori Takalshl, Masahlko Uematsu, Kolchl Watanabe

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Abstract

Measurements of the vapor-liquid coexistence curve In the critical region for the binary dichlorodlfluoromethane (CCI2F2, R12) + chlorodlfluoromethane (CHCIF2, R22) system were made by visual observation of the disappearance of the meniscus at the vapor-liquid Interface within an optical cell. Fifty-one saturated-vapor densities and thirty-seven saturated-liquid densities for seven different compositions of 0, 10, 20, 30, 50, 75, and 100 wt % R22 between 355 and 385 K (T, > 0.98) were obtained In the range of densities 280-892 kg/m3 (0.5 < p, < 1.5). The experimental error of temperature, density, and mass fraction was estimated within ±10 mK, ±0.5% and ±0.05 %, respectively. The composition dependence of the critical parameters Is analyzed and discussed on the basis of these measurements.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalJournal of Chemical and Engineering Data
Volume29
Issue number1
DOIs
Publication statusPublished - Apr 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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