Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1976-11-18
1978-11-21
Edmundson, F.C.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204 98, C25B 1308, C25B 146
Patent
active
041265351
ABSTRACT:
Fibers about micron size in cross-section of certain fluorine-containing polymers can be treated after being deposited as a diaphragm, either during operation or separately before installation, so that they develop a 0.25-millimeter-thick ply on either side of a central body which is substantially different in chemical composition. This yields a diaphragm 1 to 5 millimeters thick which has a Mullen burst strength approximately three to five times greater than that of an untreated diaphragm (20-25 pounds per square inch versus 5 to 7 pounds per square inch) and a remarkably improved service life in the treated diaphragm (200 days and up) in comparison with such untreated diaphragm (30 days or less). Use of a polymer based upon a major proportion of chlorotrifluoroethylene appears to be required. This discovery is economically significant, in that it is an essential element in the technology of the replacement of asbestos diaphragms now used with a synthetic material. Health-hazard and pollution-control considerations have made it desirable to replace asbestos, and this invention provides the key to the solution of the problem. Moreover, a synthetic-polymer diaphragm has two significant advantages that an asbestos one lacks--it will withstand washing or cleaning with an acid solution, and it does not swell in service and resists erosion, so that a closer electrode spacing can be used and the cell voltage can thus be lower.
REFERENCES:
patent: 3356607 (1967-12-01), Eisenmann et al.
patent: 3450623 (1969-06-01), Joo et al.
patent: 3694281 (1972-09-01), Ledul
patent: 3928166 (1975-12-01), O'Leary et al.
patent: 3945910 (1976-03-01), DeCeuster et al.
patent: 4026783 (1977-05-01), Grot
patent: 4036729 (1977-07-01), Patil et al.
Argade Shyam D.
Balko Edward N.
Shrewsburg James E.
BASF Wyandotte Corporation
Dunn Robert E.
Edmundson F.C.
Linkhauer John W.
Swick Bernhard R.
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