Methods and apparatus for making particles using spray dryer and in-line jet mill
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United States of America Patent
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Jul 19, 2005
Grant Date -
Jul 22, 2004
app pub date -
Jan 7, 2004
filing date -
Dec 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus are provided for making particles comprising: (a) spraying an emulsion, solution, or suspension, which comprises a solvent and a bulk material (e.g., a pharmaceutical agent), through an atomizer and into a primary drying chamber, having a drying gas flowing therethrough, to form droplets comprising the solvent and bulk material dispersed in the drying gas; (b) evaporating, in the primary drying chamber, at least a portion of the solvent into the drying gas to solidify the droplets and form particles dispersed in drying gas; and (c) flowing the particles and at least a portion of the drying gas through a jet mill to deagglomerate or grind the particles. By coupling spray drying with 'in-line' jet milling, a single step process is created from two separate unit operations, and an additional collection step is advantageously eliminated. The one-step, in-line process has further advantages in time and cost of processing.
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