Hydrocarbon detector utilizing catalytic cracking

Details Hydrocarbon detector utilizing catalytic cracking Hydrocarbon detector utilizing catalytic cracking

1988-07-12

1991-12-03

Lacey, David L.

Chemistry: analytical and immunological testing

Hydrocarbon

436140, 436141, 436142, 436143, 436159, 422 93, 422 94, C01N 2716

Patent

active

050700243

ABSTRACT:
A hydrocarbon gas detection system utilizes a heat chamber or oven to maintain the system at a temperature that will support cracking of hydrocarbon gases. A gas chamber which is located inside the oven is used to contain the flow of gases under analysis and to pass these gases over a first temperature sensing device. A catalyzing material is associated with the first temperature sensing device, either by placing it very near the temperature sensing device or by coating the temperature sensing device with the catalyzing material. A second temperature sensing device is located inside the heat chamber or oven, either outside the gas chamber, or inside the gas chamber, but separated from the first temperature sensing device. The output of the first and second temperature sensing devices extend outside of the furnace to measurement and/or display instrumentation. With this system, the gas sample under analysis is passed through the gas chamber and brought into contact with the first temperature sensing device. The catalyzing material associated with the first temperature sensing device causes cracking of any hydrocarbon gases. This cracking reaction changes the temperature of the first temperature sensing device which, together with the second temperature sensing device, causes an output voltage proportional to the change in temperature. The amount of voltage output by the system is proportional to the amount and type of hydrocarbon present in the gas sample under analysis.

REFERENCES:
patent: 3488155 (1970-01-01), Ayers
patent: 3725005 (1973-04-01), Innes
patent: 3939058 (1976-02-01), Plank et al.
patent: 4170455 (1979-10-01), Henrie
CA 107(18):167995t, "Catalytic Cracking as the Basis for a Potential Detector for Gas Chromatography".

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