Trace vapor concentrator

Details Trace vapor concentrator Trace vapor concentrator

1986-04-11

1987-10-06

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 60, 55 79, 55181, 55208, 55390, B01D 5308

Patent

active

046980717

ABSTRACT:
The specification discloses a method and apparatus for concentration of vapors present in trace quantities in the atmosphere in a continuous and rapid manner. It relates especially to a device to enhance the concentration of trace vapors to such a level that they may be more readily analyzed by appropriate instrumentation. This is of considerable value in connection with the detection of certain vapors which are associated with explosive devices and bombs. These are of considerable importance now in connection with security at airports and the like. The specification discloses a method and apparatus for the continuous concentration of trace gases in a gaseous medium, such as air, comprising the steps of bringing the air into intimate contact with a suitable free-flowing adsorption powder in an adsorption region, passing the air containing the treated powder and adsorbed vapors through a cyclone separator to produce a substantially powder-free air stream and a powder containing adsorbed vapors, then passing the powder through a desorption region whereby the powder carrying trace vapors is heated in a heating zone in the presence of a carrier stream at a temperature sufficient to release the adsorbed trace vapors of interest, and thus to produce a vapor-enriched carrier gas stream. The powder is then normally recycled into the air inlet stream.

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"New Concepts Symposium and Workshop", Oct. 30 to Nov. 1/78, Reston, Va., U.S.A.
M. Krzymien and L. Elias, "A Continuous-Flow Trace Vapour Source", National Aeronautical Establishment, National Research Council of Ottawa, Canada, Journal of Physics E: Scientific Intruments, 1976, vol. 9, pp. 584-586.
L. Elias and M. Krzymien, Laboratory Technical Report, "Method of Evaluating Sensitivity of Explosives Vapour Detectors", Jan. 1975, National Research Council, Ottawa, Canada.

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