Chemistry: physical processes – Physical processes – Crystallization
Patent
1998-03-09
2000-10-03
Dunn, Tom
Chemistry: physical processes
Physical processes
Crystallization
23302R, 23302T, 423511, 423544, 423551, B01D 900, C01B 1700, C01B 1796, C01D 500
Patent
active
061267023
ABSTRACT:
The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone and a mixing zone. Slurry containing sesquisulfate crystals is introduced into the mixing zone along with water and the material is mixed to promote dissolution of the crystals and formation of sodium sulfate solids. Sodium sulfate solids are collected in a lower portion of the treatment vessel and conveyed out of the vessel, and liquid from the clarifying zone is conducted from an upper end of the treatment vessel to a conventional liquid processing unit. Treatment of a sesquisulfate-containing slurry in accordance with the invention provides sodium sulfate containing little or no sesquisulfate crystals thereby reducing the need for vacuum filtration or other expensive separation techniques to recover sulfuric acid and sodium sulfate solids from the slurry.
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Bonsu Alexander K.
Graff Robert L.
Liu Raymond
McCann James A.
Dunn Tom
International Paper Company
Nave Eileen E.
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