Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1983-05-02
1986-10-07
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 98, 204252, 204263, C25B 126
Patent
active
046157751
ABSTRACT:
Halogen is produced by electrolyzing an aqueous halide in a specially designed cell. The cell comprises an anolyte chamber and a catholyte chamber separated by a permeable membrane or diaphragm, notably an ion exchange (generally cation exchange) polymer. At least one electrode comprises at least two sections. One section comprises a gas and electrolyte permeable layer, sheet or mat having a catalytic surface, i.e. one having a low overvoltage, (low hydrogen overvoltage if the cathode and low halogen overvoltage if the anode). This layer is spaced from the membrane by a second portion comprising an electroconductive resiliently compressible layer or mat, which is in contact with the membrane on one side thereof, the other side thereof being in contact with the main cathode.
This second or spacer section advantageously has an electrode surface having a higher overvoltage than the first electrode surface. Preferably the cathode has the above construction.
Upon electrolysis of alkali metal chloride or other halide in such a cell and with a cathode of the type described above, a low voltage is obtained even at high current densities and the cathode efficiency is high.
REFERENCES:
patent: 3344053 (1967-09-01), Neipert et al.
patent: 4105514 (1978-08-01), Justice et al.
patent: 4340452 (1982-07-01), de Nora
patent: 4377455 (1983-03-01), Kadija et al.
patent: 4381979 (1983-05-01), de Nora
patent: 4402814 (1983-09-01), Rechlicz
Patent Abstracts of Japan, vol. 7, No. 195 (C-183) (1340), Aug. 25, 1983, JP-A-5896886 (Asahi Glass K.K.) Jun. 9, 1983.
Chemical Abstracts, vol. 99, Jul. 1983, No. 2, p. 448, No. 12849r, JP 58 37,181.
De Nora Oronzio
Martelli Gian N.
Nidola Antonio
Chapman Terryence
Niebling John F.
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