G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 21/02 (2006.01) B01J 19/18 (2006.01) C01G 5/02 (2006.01) G03C 1/015 (2006.01)
Patent
CA 2066605
2066605 9203772 PCTABS00011 A method and an apparatus for controlling reactant ion concentration within a precipitation vessel to optimize the reactions occurring therein is disclosed. In one important implementation, the reactant controlled comprises halide ion in a reactor during the precipitation and growth of silver halide grains. In this embodiment, the method includes measuring the amount of halide ion within the precipitation vessel; measuring the flow rates of the halide feed stream and the silver feed stream; storing the measured halide ion concentration and measured feed stream flow rates; computing an estimated halide ion concentration value as a function of the stored measured halide ion concentration and measured feed stream flow rates; and adjustably controlling the amount of halide ion added to the precipitation vessel as a function of this estimated halide ion concentration value. Preferably, N most recent measured halide ion concentrations and measured halide and silver feed stream flow rates are stored and used in determining the estimated balide ion concentration. Mathematical algorithms are derived herein to facilitate the computation of the estimated halide ion concentration and the necessary flow rate adjustment. Analogous apparatus is also provided herein.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
Jerome Norman F.
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