Gas separation: processes – Chromatography – With heating or cooling
Patent
1997-10-23
1999-09-21
Spitzer, Robert
Gas separation: processes
Chromatography
With heating or cooling
95 89, 96102, 96105, B01D 1508
Patent
active
059548606
ABSTRACT:
An injector for a gas chromatography system resistively heats an included cold trap by magnetically inducing a high-frequency current therethrough to inject absorbed analyte into a gas chromatography separation column. The injector includes a flow controller that is set initially to load analyte into the trap. A heater and a two-stage Peltier cooler are used to establish a sharp trough-shaped temperature gradient along the cold trap so that analyte loaded into the cold trap is absorbed only at a relatively cold "focussing" zone of the trap. Once the analyte is focussed, the flow controller is set to direct released analyte into the column. The magnetic-field generator includes a capacitor that is discharged to initiate cold-trap heating. An inverter converts the discharge to a 100,000 Hz waveform through a transformer primary coil. A magnetic core delivers the resulting alternating magnetic field through the cold trap. The resulting AC current resistively heats the cold trap, volatizing analyte components so that they are injected into a gas chromatography column. The relatively modest power requirements for this compact arrangement provide for a practical cold-trap injector so that higher spatial resolution and greater effective sensitivity are achieved in the context of small-bore gas chromatography.
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B.A. Ewels and Robert D. Sachs in "Electrically Heated Cold Trap Inlet System for High-Speed Chromatography", American Chemical Society, 1985, pp. 2274-2279.
Mark A. Klemp, Michael L. Akard, and Robert D. Sachs, in "Cryofocusing Inlet with Reverse Flow Sample Collection for Gas Chromatography", American Chemical Society, 1993, pp. 2516-2521.
Hewlett--Packard Company
Spitzer Robert
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