Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1995-05-30
1996-09-24
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
42324305, 42324308, 423437R, B01D 5350
Patent
active
055588484
ABSTRACT:
An efficient and cost-effective flue gas desulfurization process for removing sulfur dioxide from waste gases is provided. The process employs a substantially solids-free clear liquor scrubbing liquid and an organic acid additive capable of maintaining a process pH of 4.5 to 6.0 under inhibited oxidation conditions in the absorber to accomplish sulfur dioxide removal while avoiding scale formation and encrustation. Calcium sulfite relative saturation is controlled to a desired low optimum level by maintaining the circulating calcium ion concentration at a corresponding optimum low level. A smaller thickener unit area is required to produce calcium sulfite crystals with optimum settling and dewatering characteristics. A reactor system that promotes the formation of small, efficiently dewatered calcium sulfite solids is also provided.
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"Gas Purification" by Kohl et al.; 3rd ed. Gulf Publishing Co.; (1979) p. 288.
Colley James D.
Hargrove, Jr. Oliver W.
Moser Robert E.
Owens David R.
Wilhelm James H.
Straub Gary P.
Studebaker Donald R.
Vanoy Timothy C.
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