Method for generating vapor streams

Details Method for generating vapor streams Method for generating vapor streams

1991-06-10

1998-08-04

Tran, Lien

Chemistry: analytical and immunological testing

Including sample preparation

136147, 136167, 136181, 422 88, 422 93, G01N 100

Patent

active

057892580

ABSTRACT:
A method is provided for use in generating a chemical vapor stream which may be used to calibrate vapor detectors and for other purposes. The vapor generator is provided with a column having a temperature controlled zone. The chemical is coated onto a carrier such as glass beads and is placed in a temperature controlled zone. A carrier gas is passed over the chemical at a rate which permits the concentration of chemical vapors in the carrier gas to be at saturation. The exiting carrier gas contains chemical vapors at a known concentration. In one embodiment, a second temperature controlled zone is provided downstream, and at a lower temperature than the first zone, to ensure saturation of the carrier gas passing through the second zone.

REFERENCES:
patent: 2880071 (1959-03-01), Gelman
patent: 3459938 (1969-08-01), Stenger et al.
patent: 3877875 (1975-04-01), Jones et al.
patent: 4198208 (1980-04-01), Lerner et al.
patent: 4942018 (1990-07-01), Hunk
patent: 5089232 (1992-02-01), May
Pella, P., "Generator for Producting Trace Vapor Concentrations . . . ", Analytical Chemistry, 48:1632-1637 (1976).

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