Phase behavior of 1,3,5-tri-tert-butylbenzene-carbon dioxide binary system


DİLEK HACIHABİBOĞLU Ç. , Manke C. W. , Gulari E.

JOURNAL OF SUPERCRITICAL FLUIDS, cilt.43, ss.421-429, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 43 Konu: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.supflu.2007.07.009
  • Dergi Adı: JOURNAL OF SUPERCRITICAL FLUIDS
  • Sayfa Sayıları: ss.421-429

Özet

1,3,5-tri-tert-butylbenzene (TTBB) is solid at ambient conditions, and has substantial solubility in liquid and supercritical carbon dioxide. We present the phase behavior of TTBB-CO2 binary system at temperatures between 298 and 328 K and at pressures up to 20 MPa. Phase diagrams showing the liquid-vapor, solid-liquid and solid-vapor equilibrium envelopes are constructed by pressure-volume-temperature measurements in a variable-volume sapphire cell. TTBB is highly soluble in CO2 over a wide range of compositions. Single-phase states are achieved at moderate pressures, even with very high TTBB concentrations. For example, at 328 K, a binary system containing TTBB at a concentration of 95% by weight forms a single-phase above 2.04 MPa. TTBB exhibits a significant melting-point depression in the presence Of CO2, 45 K at 3.11 MPa, where the normal melting point of 343 K is reduced to 298 K. With its high solubility in carbon dioxide, TTBB has potential uses as a binder or template in materials forming processes using dense carbon dioxide. (C) 2007 Elsevier B.V. All rights reserved.