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Analytic High‐Pressure Phase Equilibria. Part II: Gas Chromatography and Sampling Method Development
Author(s) -
Fourie Frederick C. v. N.,
Schwarz Cara E.,
Knoetze Johannes H.
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500633
Subject(s) - calibration , supercritical fluid , chemistry , gas chromatography , sampling (signal processing) , supercritical fluid chromatography , bar (unit) , chromatography , phase (matter) , analytical chemistry (journal) , alkane , detector , hydrocarbon , optics , organic chemistry , meteorology , physics , quantum mechanics
The phase equilibria of supercritical CO 2 ‐alkane‐alcohol mixtures were studied using online gas chromatography. Gas chromatograph design criteria and quantitative detector calibration methods are presented. An adapted manual calibration injection technique eliminated liner overload and pressure wave effects. Observation of the cell contents has proven essential for accurate vapor phase sampling. Visuals, often not visible to the naked eye, show that sampling can disrupt an equilibrated high‐pressure system even though pressure and temperature remain constant within 0.1 bar and 0.01 °C. Such disruptions may manifest in one of three phenomena: global mist formation, localized mist formation, or no‐warning droplet formation.