Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1995-06-23
1997-08-05
Bos, Steven
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
423548, 423187, C01D 710
Patent
active
056543514
ABSTRACT:
There is disclosed a process for recovering sodium bicarbonate and forming ammonium sulfate from a source containing sodium sulfate. The method involves contacting the sodium sulfate in solution with carbon dioxide and a compound containing ammonia. Sodium bicarbonate is precipitated in high purity from the solution. It is important to maintain the temperature of the source solution at or above 32.degree. C. This provision eliminates contamination of hydrates or ammonium bicarbonate components. The filtrate of the sodium bicarbonate reaction can be further processed to yield an ammonium sulfate product in the concentrated liquid or precipitated form in high purity. The basic process can be expanded to be combined with a conventional Claus process for sulphur recovery as a Tail Gas Unit, combined with lime injection to result in gypsum precipitation or can be further employed in a wet scrubbing process for FGD schemes.
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Halldorson Jake
Kresnyak Steve
Bos Steven
Hendrickson Stuart L.
Ormiston Mining and Smelting Co. Ltd.
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