Porous polyfluoroalkylene sheet useful for separating anolyte fr

Details Porous polyfluoroalkylene sheet useful for separating anolyte fr Porous polyfluoroalkylene sheet useful for separating anolyte fr

1979-08-07

1981-09-29

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204252, 204258, 204266, 204296, C25B 134, C25B 1308

Patent

active

042921465

ABSTRACT:
A porous polyfluoroalkylene sheet, very preferably of polytetrafluoroethylene, which is suitable for use as a separator in an electrolytic cell, such as one used for the electrolysis of brine, has a porosity in the range of 70 to 90%, a thickness in the range of 0.2 to 3.5 mm. and at least one of (a) an A X-ray ratio in the range of 0.1 to 0.35 and (b) a B X-ray ratio in the range of 0.75 to 0.98. Preferably the A X-ray ratio is in the range of 0.1 to 0.3, the B.sub.2 X-ray ratio is in the range of 0.75 to 0.98 and the B.sub.1 X-ray ratio is in the range of 0.1 to 0.32. The porous sheets are separators or diaphragms for electrolytic cells and the uses of such separators and cells in electrolysis processes, preferably in the electrolysis of brine, are described. Also known in the specification are a method for the manufacture of the porous sheets and a method for ascertaining which milled, sintered and leached porous sheets are more suitable for use in electrolytic processes.

REFERENCES:
patent: 3147150 (1964-09-01), Mendelsohn et al.
patent: 3281511 (1966-10-01), Goldsmith
patent: 3518332 (1970-06-01), Sklarchuk et al.
patent: 3556161 (1971-01-01), Roberts
patent: 3890417 (1975-06-01), Vallance
patent: 3910814 (1975-10-01), McBryar
patent: 4049589 (1977-09-01), Sakane
patent: 4170540 (1979-10-01), Lazarz

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