Method for making arsenic acid

Details Method for making arsenic acid Method for making arsenic acid

1989-11-09

1990-12-11

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 96, 204103, 204101, 2041824, C25B 122

Patent

active

049768328

ABSTRACT:
An arsenate solution is treated by electrolysis with membranes for at least partial conversion into arsenic acid and hydroxide. Electrolysis is carried out in an electrolytic unit containing an arrangement of electrodes and membranes. Depending on the electrode and membrane type and configuration, arsenic acid having a reduced content of alkali metal or ammonium cations and impurities is recovered. Arsenic acid-containing solution and hydroxide solution are removed. An electrolysis unit comprises, preferably, a stack of 2- or 3-compartment cells, comprising at least one electrode/membrane group arranged between terminal electrodes with or without terminal membranes. Each group may comprise a bipolar or a monopolar electrode in combination with either cationic or cationic and anionic membranes. Hydroxide and acid compartments are defined between electrodes and membranes, and diluate compartments may be defined between membranes.

REFERENCES:
patent: 3769230 (1988-09-01), Greco et al.
patent: 4372828 (1983-02-01), Ahn

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