Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1987-07-08
1992-03-24
Nelson, Peter A.
Gas separation
Means within gas stream for conducting concentrate to collector
436156, 89 11, B01D 1508
Patent
active
050984519
ABSTRACT:
A highly selective, sensitive, fast detection system and method are disclosed for detecting vapors of specific compounds in air. Vapors emanating from compounds such as explosives, or stripped from surfaces using heat and suction from a hand-held sample gun, are collected on surfaces coated with gas chromatograph (GC) material which trap explosives vapors but repel nitric oxide, then are desorbed and concentrated in one or more cold spot concentrators. A high speed gas chromatograph (GC) separates the vapors, after which specific vapors are decomposed in two pyrolyzers arranged in parallel and the resulting nitric oxide is detected. A low temperature pyrolyzer with silver produces NO from nitramines or nitrite esters; a high temperature pyrolyzer decomposes all explosives vapors to permit detection of the remaining explosives. Also disclosed is a series arrangement of pyrolyzers and gas chromatographs and an NO detector to time-shift detection of certain vapors and facilitate very fast GC analyses. The use of hydrogen as a carrier gas, plus unique collectors and concentrators, high speed heaters, NO detectors, and very fast, temperature-programmable GC's enhance selectivity, sensitivity and speed of detection.
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Achter Eugene K.
Hainsworth Eugenie
Lieb David P.
Miskolczy Gabor
Rounbehler David P.
Messenger Herbert E.
Nelson Peter A.
Thermedics Inc.
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