US EPA

1193046 

Book/Book Chapter 

Supercritical fluid flow injection method for mapping liquid-vapor critical loci of binary mixtures containing CO2 

Ziegler, JW; Chester, TL; Innis, DP; Pages, SH; Dorsey, JG 

1995 

AMER CHEMICAL SOC 

WASHINGTON 

ACS SYMPOSIUM SERIES 

608 

93-110 

WOS:A1995BE38K00006 

A simple peak-shape method(1) was used to estimate liquid-vapor critical loci of 13 binary mixtures, yielding accurate results when compared to limited available data. The technique is a flow-injection method performed with chromatographic equipment, a flame-ionization detector, and subcritical and supercritical fluids. Each analysis is performed under isobaric and isothermal conditions. The resulting detector signal indicates the phase state. Twelve to fifteen mixture critical points can be determined in about 1 - 1.5 days.The binary mixtures studied were CO2 combined with: acetone, acetonitrile, 1-butanol, chloroform, ethanol, hexane, methanol, octane, 1-octanol, 1-propanol, 2-propanol, tetrahydrofuran, and toluene. Mixture critical points were determined within 1 degrees C and 1 atm (0.1 MPa). The maximum deviation between mixture critical pressures for CO2-toluene and CO2-methanol determined by the peak-shape method and data reported from view-cell techniques was 3%. 

Hutchenson, KW; Foster, NR; 

0-8412-3324-1 

Symposium on Innovations in Supercritical Fluids - Science and Technology, at the American-Institute-of-Chemical-Engineers Annual Meeting 

SAN FRANCISCO, CA