Process and a spray drying apparatus for producing an agglomerated powder
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United States of America Patent
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-
May 27, 1997
Grant Date -
N/A
app pub date -
May 15, 1996
filing date -
Nov 17, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a spray drying and agglomerating process carried out in a spray drying chamber (1) having a conical lower section (3), in which chamber the liquid to be spray dried is atomized into a downward central stream of drying gas and the spent drying gas is withdrawn from non-central locations (5, 11) in the upper part of the drying chamber together with entrained fine particles, m the fine particles are recycled to the drying chamber by pneumatic injection thereof from a location in the lower part of the drying chamber and in one or more directions forming an angle of 0.degree.-90.degree. to the upward center axis of the chamber. An apparatus suitable for carrying out the process has the capability of performing the separation and recycling of the fine particles as specified.
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