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

Date

2008-01-01

Author

Dilek Hacıhabiboğlu, Çerağ
Gulari, Esin

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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.

Subject Keywords

Physical and Theoretical Chemistry, General Chemical Engineering, Condensed Matter Physics

URI

https://hdl.handle.net/11511/47268

Journal

JOURNAL OF SUPERCRITICAL FLUIDS

DOI

https://doi.org/10.1016/j.supflu.2007.07.009

Collections

Department of Chemical Engineering, Article

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Citation Formats

Ç. Dilek Hacıhabiboğlu and E. Gulari, “Phase behavior of 1,3,5-tri-tert-butylbenzene-carbon dioxide binary system,” JOURNAL OF SUPERCRITICAL FLUIDS, pp. 421–429, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47268.