Measuring and testing – Gas analysis – Gas chromatography
Reexamination Certificate
2006-03-31
2010-11-09
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
Gas chromatography
Reexamination Certificate
active
07827850
ABSTRACT:
This invention provides a chromatographic apparatus comprising an introduction part for a carrier gas as a main mobile phase medium, a sample injection part, a separation column comprising a stationary phase formed by coating a polymeric material, a part for housing the separation column, and a detector. The sample injection part is provided between the carrier gas introduction part and the inlet of the separation column. The chromatographic apparatus further comprises a solvent introduction means for adding a liquid solvent as a second mobile phase medium to a carrier gas and mixing them together, a mechanism for regulating the amount of the carrier gas introduced and the amount of the solvent added, and a mechanism for regulating the temperature of each flow passage. A plurality of clogging liquid stoppers, of which the liquid film thickness is equal to the inner diameter of a capillary column, are partly provided at predetermined intervals within the column in a longitudinal direction of the column. In such a state that a gas phase and a liquid phase are intermittently alternated, a mobile phase medium is moved toward a column outlet and a sample is separated by utilizing distribution between the solvent liquid film of the mobile phase medium and the column stationary phase. There is also provided a chromatographic analytical method utilizing this apparatus. According to this method, a sample can be separated without using any high pressure pump.
REFERENCES:
patent: 5235843 (1993-08-01), Langhorst
patent: 2005/0087122 (2005-04-01), Ismagliov et al.
patent: 59-141064 (1984-08-01), None
patent: 9-68522 (1997-03-01), None
patent: 2004-333270 (2004-11-01), None
patent: 98/02237 (1998-01-01), None
patent: 2004/087283 (2004-10-01), None
R.C. Fernandes, et al.; “Hydrodynamic Model for Gas-Liquid Slug Flow in Vertical Tubes”; AlChE Journal (vol. 29, No. 6); Nov. 1983; pp. 981-989; XP002507397.
T.C. Thulasidas, et al.; “Dispersion during bubble-train flow in capillaries”; Chemical Engineering Science; vol. 54, No. 1; Jan. 1999; pp. 61-76; XP002507396.
W.L. Chen, et al.; “Gas-liquid two-phase flow in micro-channels”; International Journal of Multiphase Flow; vol. 28, No. 7; Jul. 2002; pp. 1235-1247; XP002507395.
Z. Luo, et al.; “Chromatography With Dynamically Created Liquid “Stationary” Phases: Methanol and Carbon Dioxide”, Anal. Chem., American Chemical Society, Jul. 15, 2003, vol. 75, Num. 14, pp. 3557-3562.
Devito Alex
Sughrue & Mion, PLLC
Tokyo Seikan Kaisha, Ltd.
Williams Hezron
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