Process for removing aluminum from concentrated alkali metal hal

Details Process for removing aluminum from concentrated alkali metal hal Process for removing aluminum from concentrated alkali metal hal

1987-08-03

1989-05-16

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

204 98, 204128, 210673, 210681, C25B 116, C25B 126

Patent

active

048308374

ABSTRACT:
A process for purifying an alkali metal halide brine containing aluminum as an impurity which comprises adjusting the pH of the alkali metal halide brine to the range of from about 8.5 to about 9.5 and contacting the alkali metal halide brine with an ion exchange resin having a phosphonic acid group.
Using the novel process of the present invention, high purity alkali metal halide brines may be produced for use in electrolytic membrane cells which have concentrations of aluminum reduced to a level which will not cause damage to a cation exchange membrane or affect the membranes ability to transport cations or water molecules.

REFERENCES:
patent: 2911378 (1959-11-01), Bregman
patent: 4207152 (1980-06-01), Kadija et al.
patent: 4450057 (1984-05-01), Kelly
patent: 4515665 (1985-05-01), Fair et al.
patent: 4568466 (1986-02-01), Salem et al.
patent: 4578195 (1986-03-01), Moore et al.
patent: 4618403 (1986-10-01), Fair et al.
"Ion-Exchange Purification of Feed Brine for Chlor-Alkali Electrolysis Cells The Role of DUOLITE.RTM. ES-467", J. J. Wolff and R. E. Anderson, from the American Institute of Chemical Engineers, No. 219, vol. 78, 1982, pp. 46-53.

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