Process for making a calcium/sodium ferrate adduct by the electrochemical formation of sodium ferrate
Described is a process for making a calcium/sodium ferrate adduct with sodium ferrate in a divided-type electrolysis cell. The anolyte chamber of the cell is charged with an aqueous solution of sodium hydroxide and a sodium ferrate-stabilizing proportion of at least one sodium halide salt. The anolyte chamber additionally contains ferric ions (Fe(III)). The catholyte chamber contains an aqueous sodium hydroxide solution during operation. The source of ferric ion in the anolyte may be either an iron-containing anode or at least one iron-containing compound present in the anolyte solution or both. The preferred material separating the anolyte chamber from the catholyte chamber is comprised of a gas- and hydraulic-impermeable, ionically-conductive, chemically-stable ionomeric film (e.g., a cation-exchange membrane with carboxylic, sulfonic or other inorganic exchange sites). Sodium ferrate is prepared in the anolyte chamber by passing an electric current and impressing a voltage between the anode and cathode of the cell. During electrolysis, sodium ferrate forms in the aqueous sodium hydroxide anolyte. This anolyte is reacted with a calcium compound to produce a calcium/sodium ferrate adduct. Alternatively the sodium ferrate may be first recovered in a solid form and then reacted with a calcium compound to produce said adduct.
- Assignee:
- Olin Corporation
- Patent Number(s):
- US 4451338
- OSTI ID:
- 6507386
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400400* -- Electrochemistry
ADDUCTS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CALCIUM COMPOUNDS
CHEMICAL PREPARATION
CHEMISTRY
DISPERSIONS
ELECTROCHEMISTRY
ELECTROLYSIS
ELECTROLYTIC CELLS
FERRATES
HYDROGEN COMPOUNDS
HYDROXIDES
IRON COMPOUNDS
LYSIS
MIXTURES
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS