Process for purifying aqueous buffer solutions

Details Process for purifying aqueous buffer solutions Process for purifying aqueous buffer solutions

2005-11-01

2005-11-01

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C423S243080

Reexamination Certificate

active

06960332

ABSTRACT:
The present invention describes a procedure for the removal of sodium sulphate from a phosphate solution that has been used for absorption of SO2from flue gases, in which a precipitate forms when the absorption solution is regenerated by evaporation. In this procedure a part of the precipitate is separated from its solution and treated with water and SO2for transformation of disodium-hydrogen phosphate into monosodium dihydrogen phosphate in the aqueous solution. The sodium sulphate remains undissolved and is removed by filtration. The filtrate is then added back to the main process.

REFERENCES:
patent: 3911093 (1975-10-01), Sherif et al.
patent: 4519994 (1985-05-01), Smalheiser
patent: 4559212 (1985-12-01), Erga
patent: 4948572 (1990-08-01), Erga
patent: 5108625 (1992-04-01), Erga
patent: 6096239 (2000-08-01), Fung et al.
patent: 8907973 (1989-09-01), None

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