Supercritical Fluid Extraction and Chromatography

Authored by: J. Bruno Thomas , D. N. Svoronos Paris

Handbook of Basic Tables for Chemical Analysis Third Edition

Print publication date:  December  2010
Online publication date:  December  2010

Print ISBN: 9781420080421
eBook ISBN: 9781420080438
Adobe ISBN:

10.1201/b10385-5

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Abstract

The following table lists some useful carrier and modifier fluids for supercritical fluid extraction and chromatography, along with relevant properties [13]. The critical properties are needed to determine successful fluid operating ranges. Where possible, experimental values are provided. In some cases, however, values calculated with a group contribution approach are presented [2]. These entries are marked with an asterisk. The dipole moment is provided to assess fluid polarity, although these values can be temperature dependent, especially with the more complex fluids. Occasionally, conformations change with temperature, resulting in a change in the dipole moment. Data on ultraviolet cutoff are provided to allow the application of UV-vis monitoring instrumentation. Data are not provided if the only electronic transition is in the very low wavelength range, and the spectrum is largely flat. With respect to the halocarbon fluids, if a commonly used refrigerant designator is available, it is presented with the chemical name. The fluids listed here have either been used or proposed for use in supercritical fluid chromatography or supercritical fluid extraction. The reader should also note that some of these fluids (for example, methanol and toluene) will undergo serious chemical degradation under near critical conditions while in contact with stainless steels and other common materials [47].

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