B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/349
B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01)
Patent
CA 1303822
24 USE OF SEA WATER IN FLUE GAS DESULFURIZATION ABSTRACT OF THE INVENTION Efficient removal of sulfur dioxide from a flue gas stream is achieved in a scrubber using a recirculating aqueous stream containing magnesium hydroxide and magnesium sulfite which together act as a SO2 absorbent. Magnesium sulfite is derived from magnesium hydroxide, which is the product of a reaction between soluble magnesium from the seawater and calcium hydroxide added to the scrubbing system. Magnesium sulfite and bisulfite are oxidized to magnesium sulfate by the introduction of air. Magnesium sulfate is converted back to magnesium hydroxide by reaction with additional calcium hydroxide, with gypsum as a by-product. Gypsum is soluble in large amounts of seawater and may be returned to the ocean without adverse environmental impact. 5268-332
569677
Abrams Jack Z.
Awerbuch Leon
Benz August D.
Haidinger John
Zaczek Stanley J.
Bechtel Group Incorporated
Fetherstonhaugh & Co.
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