Method and apparatus for determining total oxygen demand of com

Details Method and apparatus for determining total oxygen demand of com Method and apparatus for determining total oxygen demand of com

1974-06-04

1976-05-25

Scovronek, Joseph

Chemistry: physical processes

Physical processes

Crystallization

23253PC, 204195S, 204195IT, G01N 2726, G01N 3110, G01N 3112, G01N 3318

Patent

active

039589374

ABSTRACT:
A method and an apparatus are provided for determining the total oxygen demand of combustible materials in an aqueous dispersion.
In the first step, a feed gas stream composed of an inert gas containing oxygen is continuously supplied at a constant rate to a combustion conduit having a porous catalyst bed within a combustion zone which is heated at a combustion supporting temperature and an effluent gas from the combustion conduit is supplied to an oxygen detector. In the second step, by means of a bypass the flow rate of the feed gas stream is decreased to a value lower than that of the first step. In the third step, a small sample of the combustible material in an aqueous dispersion is injected into the combustion supporting feed gas stream in advance of the catalyst bed within the combustion zone. As the sample is introduced into the combustion conduit, the combustible materials in the aqueous dispersion are burned. After prosecution of this third step, the flow rate of the feed gas stream is increased again to the same value as in the first step. An electrical signal is generated corresponding to the total oxygen demand for burning the combustible materials.

REFERENCES:
patent: 3560156 (1971-02-01), Teal et al.
patent: 3679364 (1972-07-01), Teal et al.
patent: 3784359 (1974-01-01), Parth
patent: 3791937 (1974-02-01), Besson et al.
patent: 3819499 (1974-06-01), Hoogeveen et al.
J. T. Clerc et al, Microchemical Journal, vol. 7 pp. 422-436 (1963).

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