Measuring and testing – Gas analysis – Gas chromatography
Patent
1991-06-03
1992-12-08
Williams, Hezron E.
Measuring and testing
Gas analysis
Gas chromatography
G01N 3008
Patent
active
051687461
ABSTRACT:
A portion of the ambient air, including the selected vapor such as the ether vapor fraction, is first cryogenically liquefied for concentration in a collecting vessel (12). Thereafter, the concentrated liquefied fraction is boiled off and passed through gas chromatography column (34) to separate the fractions in the vapor stream. The selected vapor fraction is eluted at the temperature, and its concentration is detected by thermal conductivity detector (42) so that the concentration of the selected vapor in the environment is signaled.
REFERENCES:
patent: 3053077 (1962-09-01), Tracht
patent: 3427863 (1969-02-01), Schultz
patent: 4042326 (1977-08-01), Kallos
patent: 4185490 (1980-01-01), Clouser et al.
Madhusudhan Chilengi P.
Otero Joaquin M.
Alkov L. A.
Denson-Low W. K.
Hughes Aircraft Company
Roskos Joseph W.
Williams Hezron E.
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