Gas separation: processes – Chromatography
Reexamination Certificate
2006-05-11
2008-12-23
Smith, Duane (Department: 1797)
Gas separation: processes
Chromatography
C095S087000, C096S102000, C096S105000, C096S106000, C073S023420
Reexamination Certificate
active
07468095
ABSTRACT:
A system for controlling the flow rate into a chromatographic column is disclosed generally comprising communicating a fluid to the column through a transfer line, measuring the transfer line inlet pressure, determining the transfer line outlet pressure, and adjusting the applied pressure until the inlet and outlet pressures produce a desired flow rate for the transfer line outlet. In certain embodiments, the applied pressure is adjusted by controlling a proportional valve. In some embodiments, the outlet pressure is determined by measuring the pressure difference across the transfer line and calculating the transfer line outlet pressure from the measured inlet pressure and the pressure difference.
REFERENCES:
patent: 3405551 (1968-10-01), Halasz
patent: 4962662 (1990-10-01), Berger
patent: 5545252 (1996-08-01), Hinshaw et al.
patent: 5711786 (1998-01-01), Hinshaw
patent: 5952556 (1999-09-01), Shoji
patent: 6338823 (2002-01-01), Furukawa
patent: 6341520 (2002-01-01), Satoh et al.
patent: 6494078 (2002-12-01), Klee
patent: 6652625 (2003-11-01), Tipler et al.
patent: 6813929 (2004-11-01), Jochum, Jr.
patent: 7135056 (2006-11-01), Henderson
patent: 2002/0194898 (2002-12-01), Klee
patent: 2005/0155409 (2005-07-01), Niutta et al.
patent: 2005/0210957 (2005-09-01), Tipler et al.
patent: 2005/0284209 (2005-12-01), Tipler et al.
patent: 2006/0016245 (2006-01-01), Tipler et al.
patent: 43 16 375 (1994-06-01), None
patent: 0 730 151 (1996-09-01), None
patent: 2310611 (1997-09-01), None
patent: WO 02/25391 (2002-03-01), None
patent: WO 03/071265 (2003-08-01), None
patent: WO 2004/013578 (2004-02-01), None
patent: WO 2004/053478 (2004-06-01), None
patent: WO 2005/088296 (2005-09-01), None
F.R. Gonzalez et al. “Theoretical and practical aspects of flow control in programmed-temperature gas chromatography” Journal Of Chromatography, Elsevier Science Publishers B.V. Amsterdam, NL, vol. 757, No. 1-2, Jan. 3, 1997, pp. 97-107.
R. Shellie, P. Marriott, P. Morrison, L. Mondello. “Effects of pressure drop on absolute retention matching in comprehensive two-dimensional gas chromatography” Journal Of Separation Science, vol. 27, No. 7-8, May 7, 2004, pp. 504-512.
L.M. Blumberg. “Method Translation and Retention Time Locking in Partition GC” Analytical Chemistry, American Chemical Society. Columbus, US, vol. 70 No. 18, Sep. 15, 1998, pp. 3828-3839.
Chenghong Li et al. “Optimal Packing Characteristics of Rolled, Continuous Stationary-Phase Columns” American Chemical Society and American Institute of Chemical Engineers Published on web Feb. 13, 2002, pp. 309-316.
International Search Report, Oct. 5, 2006, 4 pages.
Edwards Richard G
Tipler Andrew
Clemente Robert A
PerkinElmer LAS, Inc.
Smith Duane
St. Onge Steward Johnston & Reens LLC
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