Chemistry: physical processes – Physical processes – Crystallization
Patent
1979-07-19
1981-01-13
Richman, Barry S.
Chemistry: physical processes
Physical processes
Crystallization
23230M, 23906, 422 79, G01N 3112, G01N 3318
Patent
active
042446953
ABSTRACT:
For the quantitative determination of the total oxygen demand of water containing oxidizable matter, the water is continuously evaporated at about 900.degree. C. in the presence of varying amounts l.sub.1, . . . , l.sub.n of oxygen-containing gas added per unit of steam at continuously repeated intervals. The oxygen-containing gas should not exceed 1 to 5% by volume, calculated on the amount of steam produced during each interval. The residual oxygen concentrations S.sub.1, . . . , S.sub.n in the steam gas/mixture are measured for the different amounts of oxygen-containing gas added and the oxygen demand is calculated from the residual concentrations and the added amounts of the oxygen-containing gas.
REFERENCES:
patent: 3560156 (1971-02-01), Teal et al.
patent: 3607071 (1971-09-01), Staffin et al.
patent: 3679364 (1972-07-01), Teal et al.
patent: 3933429 (1976-01-01), Shibata et al.
patent: 3958937 (1976-05-01), Shibata et al.
patent: 4074973 (1978-02-01), Igaki et al.
Butzelaar; P. F. et al., "A Method of Measuring the Oxygen Demand of Water"; Philips Tech. Rev. 34, 1974; No. 5/6, pp. 123-128.
Jaenicke Dieter
Melzer Werner
Hoechst Aktiengesellschaft
Richman Barry S.
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