Gas separation: processes – Chromatography – With heating or cooling
Patent
1994-03-04
1995-09-05
Spitzer, Robert
Gas separation: processes
Chromatography
With heating or cooling
95 89, 96102, 96105, 96106, B01D 1508
Patent
active
054475562
ABSTRACT:
An apparatus for sample concentration for gas chromatography and mass spectrometry for analysis for volatile organic compounds, including a hollow differential pressure switch to switch sample flow non-mechanically, and so that the gas chromatograph and apparatus may be used with different sample levels of volatile organic compounds by changing the timing and temperature parameters by changing the flow non-mechanically. The differential pressure switch preferably has a central helium port, a sample flow port, a sweep flow port, a vent end, and an assist/column flow end; an expansion volume chamber having an inlet tube, which is inserted through the assist/column flow end and extends to halfway between the helium port and sample port, a coiled piece of tubing, and an outlet tube; a primary collection trap coiled about a rod having an entry port for a cryogenic substance, an inlet end, a heater at the inlet end, and an outlet, wherein the expansion volume chamber outlet tube connects to the primary collection trap inlet end; and an assist/column interface having an inlet end connected to the outlet of the primary collection trap, an arm connected to a mass flow controller valve and vacuum system; and an outlet end connected to the analytical column. The method of the invention utilizes this apparatus to concentrate a sample suspected of containing VOC's, by adjusting the temperature, flow rates, and whether particular gas flows are turned on or off.
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Pleil Joachim D.
Stroupe Michael L.
Graseby-Anderson, Inc.
Spitzer Robert
United States of America
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