Method and apparatus for processing waste sulfuric acid

Details Method and apparatus for processing waste sulfuric acid Method and apparatus for processing waste sulfuric acid

1994-06-17

1995-11-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041825, B01D 6144

Patent

active

054663520

ABSTRACT:
A method for processing waste sulfuric acid which is contaminated with halides and has an acid content up to 40% which comprises subjecting the waste sulfuric acid to an electrodialysis in which the electric field causes the univalent halides to permeate through an anion exchange membrane and to be selectively removed while the divalent sulfate ions of the sulfuric acid are substantially retained, the sulfuric acid leaving the electrodialyzer being almost entirely free of halides. A corresponding apparatus is also provided.

REFERENCES:
patent: 3616385 (1971-10-01), Kloss
patent: 3673067 (1972-06-01), Harwood et al.
patent: 4715939 (1987-12-01), Ball et al.
patent: 4717450 (1988-01-01), Shaw et al.
patent: 4740281 (1988-04-01), Chlanda et al.
patent: 4802966 (1989-02-01), Aoki et al.
patent: 5162076 (1992-11-01), Chiao et al.

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