Powder formation by atmospheric spray-freeze drying
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United States of America Patent
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Dec 4, 2012
Grant Date -
Jul 3, 2008
app pub date -
Mar 18, 2008
filing date -
Dec 22, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of manufacturing heat-sensitive pharmaceutical powder is disclosed. The original pharmaceutical substances are dissolved in a solution or suspended in a suspension, which is sprayed through an atomizing nozzle and frozen in a cold gas phase or liquid nitrogen atomized directly in the spray-freeze chamber or gas jacket at the same time (for cooling purposes). The particles are freeze-dried at roughly atmospheric pressure in a down-stream fluid flow with exit filter thereby to remove moisture entrapped on or inside the frozen particles. The system has applicability for forming other powders.
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