Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1991-06-18
1992-08-25
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55267, 55386, B01D 1508
Patent
active
051415348
ABSTRACT:
A gas chromatography system of the type incorporating a thermal focusing chamber for introducing a sample into a column for separation and analysis. The system of the present invention provides benefits in terms of reducing memory effect of one analysis being influenced by prior experiments, a reduction in system dead volume which leads to broadening of peaks produced on the chromatogram and artifacts caused by sample decomposition. These advantages are achieved principally through a novel fluid circuit in which the sample is trapped onto the column by trapping it at the end of the thermal focusing chamber closest to the column. This feature has the effect of eliminating the necessity of the sample residing in the heated focusing chamber for a period giving rise to sample decomposition. This system further avoids the necessity of passing the inlet flow through mechanical valves which also contributes to memory effect. This system further has the benefit of enabling sampling of sources at various pressures including ambient pressure as an air quality sensing probe. An alternative embodiment is a simplified system for enabling ambient pressure source monitoring without mechanical valves in the sample flow path.
REFERENCES:
patent: 3111835 (1963-11-01), Jenkins
patent: 3220164 (1965-11-01), Golay
patent: 3496702 (1970-02-01), Carel et al.
patent: 3550428 (1970-12-01), Mator et al.
patent: 3735565 (1973-05-01), Gilby et al.
patent: 3948602 (1976-04-01), Solomon
patent: 4035168 (1977-07-01), Jennings
patent: 4038053 (1977-07-01), Gday
patent: 4477266 (1984-10-01), Yang et al.
patent: 4805441 (1989-02-01), Sides et al.
patent: 4863871 (1989-09-01), Munari et al.
patent: 4923486 (1990-05-01), Rubey
patent: 4962042 (1990-10-01), Morabito et al.
"Sample Enrichment in High Speed Narrow Bore Capillary Gas Chromatography", Van Es et al., J. of High Resolution Chrom. & Chrom, Communications, vol. 11, Dec. 1988, pp. 852-857.
"Rapid Evaporation of Condensed Gas Chromatographic Fractions", Hopkins et al., J. of Chromatography, 158 (1978) 465-469.
B. A. Ewels and R. D. Sacks, 1985, "Electrically Heated Cold Trap Inlet System for High-Speed Gas Chromatography", Analytical Chemistry, 57, 2774-2779.
Lanning, Sacks, Mouradian, Levine, Foulke, "Electrically Heated Cold Trap Inlet System for Computer-Controlled Controlled High-Speed Gas Chromatography", Anal. Chem. 1988, 60, 1994-1996.
S. Levine, R. Sacks, Jul. 1, 1986-Jun. 30, 1988, "Fast-GC for Industrial Hygiene Monitoring/Analysis", U. of Michigan, Grant No. 86-863-J1.
Klemp Mark A.
Rankin Christine L.
Sacks Richard D.
Spitzer Robert
The Regents of the University of Michigan
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