Process for forming a porous polyfluoroalkylene sheet useful for

Details Process for forming a porous polyfluoroalkylene sheet useful for Process for forming a porous polyfluoroalkylene sheet useful for

1981-06-26

1982-08-03

Andrews, R. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

264 49, C25B 1302, C25B 1308, C25B 1304

Patent

active

043426360

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 incorporated in 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 shown 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: 3890417 (1975-06-01), Vallance
patent: 4003818 (1977-01-01), Juillard et al.
patent: 4250002 (1981-02-01), Lazarz et al.
patent: 4256845 (1981-03-01), Morris et al.
patent: 4289600 (1981-09-01), Lazarz et al.

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