GB867373A - Improvements in or relating to generator cells - Google Patents

Abstract

867,373. Electrolytic testing apparatus. KLEES, P., and KLEES, K. F., [trading as KLEES GEB.]..Sept. 15, 1959 [Sept. 15, 1958], No. 31401/59. Class 37. A cell for the electrolytic generation of reagents, used, for example in continuous titration processes, comprises a casing 2 across which extends a mass of ion-exchange material 4 to divide the cell into two outer compartments, each compartment containing electrolyte and an electrode 3, the electrode in one of the compartments being surrounded by a tubular porous diaphragm 1 through which flows the electrolyte 6 in which the reagent is to be generated. By this means unwanted components generated are fixed by the ion-exchanger and consequent loss of reagent due to recombination after its production is prevented; the quantity of reagent produced is thus accurately proportional to the quantity of electricity fed to the cell. In the arrangement shown in Fig. 1, the electrode in the other compartment is surrounded by a tubular porous diaphragm similar to the diaphragm 1; in the modification of Fig. 2, however, a porous diaphragm 7 is arranged between this compartment and the ion-exchange material, electrolyte flowing continuously through the compartment from an inlet tube 8 to an outlet tube 10. The electrode 3 may be divided into two or more part electrodes each with its separate current supply, Fig. 3 (not shown; this simplifies the fine control of the current supply to this electrode. Fig. 4 shows the application of the cell of Fig. 1 to a continuous titration process. The solution to be titrated is fed through the tube 1 to a pH-measuring section 13 connected to measurement means 14 controlling a motor 16. The motor 16 positions the wiper arm of a potentiometer 17, so adjusting the current supplied to the cell as to maintain the pH measured in the section 13 at a desired value. The current flowing is indicated on a meter 18 and provides a measure of the cocentration of the ions being titrated in the solution flowing through the tube 1.