Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1986-01-14
1987-11-03
Doll, John
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
210681, 423308, B01D 1502
Patent
active
047042621
ABSTRACT:
A process for the production of dialkali metal phosphates by ion exchange is disclosed. The process is carried out by first ammoniating a water-soluble phosphate source such as phosphoric acid or monocalcium phosphate. The resulting ammoniated phosphate solution is then contacted with a weak cation exchange resin in the alkali metal form to produce the dialkali metal phosphate as well as an ammonium-loaded weak cation exchange resin. The cation exchange resin is regenerated by contacting it with an alkali metal salt solution which effects an exchange of alkali metal from ammonium to produce a rgenerated weak cation exchange resin in the alkali metal form as well as a water-soluble ammonium salt corresponding to the initial alkali metal salt. The process may be carried out in conventional fixed or pulsed bed ion exchange systems although it is most advantageously carried out in an Advanced Separation Device which is a multi-chambered device which enables the process to be carried out both continuously and with a greater degree of efficiency than is possible using conventional ion exchange systems.
REFERENCES:
patent: 1369763 (1921-02-01), Hetherington et al.
patent: 4522726 (1985-06-01), Berry et al.
patent: 4591439 (1986-05-01), Grot
patent: 4599225 (1986-07-01), Dickey
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 13 (1981), John Wiley & Sons, pp. 678, 685 and 686.
Advanced Separation Technologies Incorporated
Doll John
Langel Wayne A.
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