Byproduct solids crystal modification with organic acids in wet

Details Byproduct solids crystal modification with organic acids in wet Byproduct solids crystal modification with organic acids in wet

1996-08-19

1998-03-31

Jones, Deborah

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324305, C01B 1720

Patent

active

057335176

ABSTRACT:
A wet, calcium-based flue gas desulfurization process conducted under inhibited oxidation conditions and in the presence of at least one organic acid which both enhances the efficiency of sulfur dioxide removal and modifies the crystal habit of calcium sulfite crystals to produce large, thick, regular, easily dewatered calcium sulfite hemihydrate byproduct solids is provided. The addition of an organic acid, preferably a carboxylic acid, to the flue gas desulfurization process produces calcium sulfite crystals that closely resemble calcium sulfate or gypsum crystals in settling and dewatering properties.

REFERENCES:
patent: 3632306 (1972-01-01), Villiers-Fisher et al.
patent: 4222993 (1980-09-01), Holter et al.
patent: 4294807 (1981-10-01), Randolph
patent: 4454101 (1984-06-01), Garrison et al.
patent: 5246679 (1993-09-01), Moser et al.
DuPont Chemicals, Wilmington, DE, "Dibasic Acid (DBA)" (Date unknown).
Monsanto Chemical Co., St. Louis, MO, "AGS Mixture (50%)" (May 10, 1993).
Monsanto Chemical Co., St. Louis, MO, "Monsanto Adipic Acid and 50% AGS Mixture for Flue Gas Desulfurization (FGD)" (May 10, 1993).

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