Process for drying high-lactose aqueous fluids
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United States of America Patent
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Jul 10, 2007
Grant Date -
Oct 30, 2003
app pub date -
Mar 3, 2003
filing date -
Mar 4, 2002
priority date (Note) -
In Force
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Abstract
Systems and methods for processing a high-lactose aqueous fluid (HLAF), such as permeate from ultrafiltration of whey fluid, are described. The preferred process includes concentrating HLAF containing from about 1 to about 35% solids, wherein at least 50% of the solids are lactose, to form a concentrated HLAF containing from about 45 to about 65% solids; further concentrating the HLAF to form a highly concentrated HLAF containing from about 70 to about 80% solids; cooling the highly concentrated HLAF with a gaseous fluid to create a cooling, concentrating, crystallizing cascade to further concentrate the HLAF to form a partially crystallized HLAF containing from about 78 to about 88% solids; and drying the partially crystallized HLAF in an air-lift dryer to form a product rich in crystalline alpha-lactose monohydrate. An air-lift dryer having diverging sidewalls and methods of using same are also disclosed.
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