Chemistry: analytical and immunological testing – Pyrolysis – combustion – or elevated temperature conversion – Multiple stages of heating or heating at multiple...
Patent
1991-04-29
1993-04-20
Housel, James C.
Chemistry: analytical and immunological testing
Pyrolysis, combustion, or elevated temperature conversion
Multiple stages of heating or heating at multiple...
250343, 250373, 356246, 422 78, 422 80, 422 8205, 436155, 436159, 436160, 436165, G01N 2524, G01N 3112, G01N 110, G01J 308
Patent
active
052042707
ABSTRACT:
A furnace with two hot zones holds multiple analysis tubes. Each tube has a separable sample-packing section positioned in the first hot zone and a catalyst-packing section positioned in the second hot zone. A mass flow controller is connected to an inlet of each sample tube, and gas is supplied to the mass flow controller. Oxygen is supplied through a mass flow controller to each tube to either or both of an inlet of the first tube and an intermediate portion between the tube sections to intermingle with and oxidize the entrained gases evolved from the sample. Oxidation of those gases is completed in the catalyst in each second tube section. A thermocouple within a sample reduces furnace temperature when an exothermic condition is sensed within the sample. Oxidized gases flow from outlets of the tubes to individual gas cells. The cells are sequentially aligned with an infrared detector, which senses the composition and quantities of the gas components. Each elongated cell is tapered inward toward the center from cell windows at the ends. Volume is reduced from a conventional cell, while permitting maximum interaction of gas with the light beam. Reduced volume and angulation of the cell inlets provide rapid purgings of the cell, providing shorter cycles between detections. For coal and other high molecular weight samples, from 50% to 100% oxygen is introduced to the tubes.
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Housel James C.
Soderquist Arlen
Wray James C.
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