Gas separation: processes – Chromatography – Plural separate columns
Patent
1994-06-09
1996-02-20
Spitzer, Robert
Gas separation: processes
Chromatography
Plural separate columns
95 87, 96104, 96105, 96106, 73 2337, 73 2341, B01D 1508
Patent
active
054925550
ABSTRACT:
A multidimensional gas chromatograph (GC) system having wide bore capillary and narrow bore capillary GC columns in series and having a novel system interface. Heart cuts from a high flow rate sample, separated by a wide bore GC column, are collected and directed to a narrow bore GC column with carrier gas injected at a lower flow compatible with a mass spectrometer. A bimodal six-way valve is connected with the wide bore GC column outlet and a bimodal four-way valve is connected with the narrow bore GC column inlet. A trapping and retaining circuit with a cold trap is connected with the six-way valve and a transfer circuit interconnects the two valves. The six-way valve is manipulated between first and second mode positions to collect analyte, and the four-way valve is manipulated between third and fourth mode positions to allow carrier gas to sweep analyte from a deactivated cold trap, through the transfer circuit, and then to the narrow bore GC capillary column for separation and subsequent analysis by a mass spectrometer. Rotary valves have substantially the same bore width as their associated columns to minimize flow irregularities and resulting sample peak deterioration. The rotary valves are heated separately from the GC columns to avoid temperature lag and resulting sample deterioration.
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Bechtold William E.
Strunk Michael R.
Lovelace Biomedical & Environmental Research Institute, Inc.
Phillips Roger F.
Spitzer Robert
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