Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-09-28
1992-03-17
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55197, 55208, 55386, B01D 1508
Patent
active
050964712
ABSTRACT:
Gas chromatography apparatus and procedures are described which enables gas chromatography to be carried out more rapidly than in accordance with prior art techniques and further enables chromatogram peaks caused by materials of interest from being obscured due to their super imposition upon high peak long durations produced by another component of peaks in an organic mixture. Reductions in chromatography evaluation time are achieved through employing a vacuum pump which caused backflushing of a very short column after materials of interest have been eluted but before higher boiling points components of the mixture have eluted. Backflushing is carried out using a vacuum pressure source which when used with a short column, permits rapid and complete backflushing. The chromatography system according to this invention allows simultaneous column backflushing while a new sample is being collected in a cooling chamber for cryofocussing for a subsequent injection. Another aspect of the invention is to cause a reversal in the flow direction through the column to occur at or just after a high intensity long duration peak causing component the mixture has eluted causing the remaining components to be drawn back into a thermal focusing chamber for subsequent injection. By stopping the process at this point the concentration of high long duration peak forming materials which have been eluted can be reduced so that subsequent reinjection will reveal features of interest in the chromatogram which would have otherwise been obscured.
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Klemp Mark
Rankin Christine
Sacks Richard
Spitzer Robert
The Regents of the University of Michigan
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