Chemistry: electrical and wave energy – Processes and products
Patent
1979-12-27
1981-05-19
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204128, C25B 135
Patent
active
042683661
ABSTRACT:
A flow of an alkali hydroxide solution such as chloralkali cell liquor containing NaOH and NaCl is introduced into the anode compartment of a hybrid cell which also includes a cathode compartment and a central compartment. The anode compartment is defined by a first surface of a gas diffusion type, electrode and a first surface of a gas diffusion type, electrode and a first surface of a cation permeable membrane. The central compartment is defined by a second surface of the cation permeable membrane, which membrane is opposite such first membrane surface and a first surface of a diaphragm. The cathode compartment is defined by a second surface of such diaphragm opposite such first diaphragm surface and a first surface of a gas diffusion type cathode. Gaseous hydrogen is supplied to the anode; air is supplied to the cathode, in each case at the surface opposite the aforementioned first surfaces, and water is supplied to the central compartment which is a flow communication with the cathode compartment. Anode cell liquor having, e.g., about 12% caustic content, is introduced into the anode compartment. The chloralkali cell is electrically in series with the hybrid cell. When the same number of coulombs flow through the chloralkali cell and the hybrid cell, sodium ions pass from the chloralkali cell liquor through the membrane to the central compartment and by diffusion and fluid flow to the cathode compartment. Hydroxide ion is generated by reduction of oxygen at the cathode and there is formed a purified concentrated caustic solution as product. Concentration occurs by electrolytic consumption of water and evaporation of water from the cathode.
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patent: 3654104 (1972-04-01), Yoshida et al.
patent: 4035255 (1977-07-01), Gritzner
patent: 4117809 (1978-09-01), Murayama et al.
Andrews R. L.
Occidental Research Corporation
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