Control of process humidity to produce large, porous particles

Details Control of process humidity to produce large, porous particles Control of process humidity to produce large, porous particles

2004-10-29

2008-12-30

Landau, Sharmila (Department: 1611)

Drying and gas or vapor contact with solids

Process

With fluid current conveying or suspension of treated material

C424S043000, C424S046000, C424S489000, C514S951000, C034S372000, C427S213000

Reexamination Certificate

active

07469488

ABSTRACT:
Spray dried particles having specified aerodynamic characteristics are produced by atomizing a liquid feed and contacting the liquid feed with a drying gas, such as, for example, air or nitrogen. The humidity of the drying gas is controlled to a value, expressed, for instance, as dew point, which is known to produce particles having a specified tap density or aerodynamic diameter. Particles having a volume median geometric diameter greater than about 5 microns and a tap density less than about 0.4 g/cm3are preferred.

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