Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1996-04-19
1997-09-02
Valentine, Donald R.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
23305A, C01F 702, C22B 1300
Patent
active
056628803
ABSTRACT:
A method of making activated alumina includes beginning with a leach liquor of potassium and aluminum sulphates that is subjected to a surface-cooled crystallizer with a heat-exchanger input temperature of 160.degree. F. and a surface-chilled temperature of 60.degree. F. to 80.degree. F. Crystals of aluminum sulphate are precipitated and recrystalized by evaporation in a vacuum and at an elevated temperature. Purified crystals of aluminum sulphate are then dried at 50.degree.-60.degree. C. The dried aluminum sulphate crystals are then dehydrated at 400.degree.-450.degree. C. after a rise rate of 10.degree.-20.degree. C. per minute to drive off most of the water. A roasting and recalcination step at 900.degree. C.-950.degree. C. after a rise rate of 10.degree.-20.degree. C. per minute is used drive off the sulphate. The remaining alumina is useful as a high-grade catalyst.
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Ahghar Massoud
Lane Stephen J.
Rendall John S.
Schatzel Thomas E.
Solv-Ex Corporation
Valentine Donald R.
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