Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1980-05-06
1981-09-22
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 87, 204 97, 204 98, C25B 100, C25B 116, C25B 122
Patent
active
042908647
ABSTRACT:
Chromic acid production is now simplified in a process using the concentrated dichromate typically available at an intermediate stage when chromic acid is produced from chrome ore. In the process, the dichromate is treated in a three-compartment cell as, for example, after removal of the sulfate or carbonate salt evolved in the overall production process. The dichromate feed enters the center compartment of the three-compartment cell and then flows through a porous diaphragm to the anode compartment of the cell and is electrolyzed at elevated current density. Depleted feed solution may be withdrawn from the center compartment and recirculated for reuse. Concentrated, water-white alkali product is produced in the cathode compartment. The anolyte from the cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recirculated for subsequent electrolysis, as by combination with the feed. Both alkali product and anolyte chromic acid can be produced at enhanced current efficiency.
REFERENCES:
patent: 2081787 (1937-05-01), Boss
patent: 2099658 (1937-11-01), Pearson et al.
patent: 3222267 (1965-12-01), Tirrell et al.
patent: 3305463 (1967-02-01), Carlin
patent: 3454478 (1969-07-01), Carlin
patent: 3481851 (1969-12-01), Lancy
Babinsky Andrew D.
Kidon William E.
Shuster Nicholas
Diamond Shamrock Corporation
Freer John J.
Williams Howard S.
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