Pulsed carrier gas flow modulation for selectivity enhancements with gas chromatography using series-coupled column ensembles
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United States of America Patent
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Mar 9, 2004
Grant Date -
Jun 12, 2003
app pub date -
May 23, 2002
filing date -
Dec 10, 2001
priority date (Note) -
Expired
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Abstract
A gas chromatography system having a computer-controlled venting valve system that delivers pressurized pulses to a column junction point of two series-coupled columns having different stationary-phase chemistries and a method of using the same. Each pressurized pulse causes a differential change in the carrier gas velocities in the two columns, which lasts for the duration of the pressurized pulse. Whereby, the pressurized pulse selectively increases the separation of a component pair that exhibits separation at the exit of the first column, but otherwise co-elutes from the column ensemble.
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