Methods of crystal precipitation
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United States of America Patent
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Feb 12, 2008
Grant Date -
Mar 9, 2006
app pub date -
Sep 17, 2003
filing date -
Sep 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Crystals of paroxetine hydrochloride 1/2-hydrate are allowed to separate out by adding water to a solution or suspension comprising paroxetine hydrochloride and a polar organic solvent which contains no water or at most 60% by weight of water to adjust the water content to at least 70% by weight when crystals of paroxetine hydrochloride 1/2-hydrate are allowed to separate out in a water-containing polar organic solvent. Crystals of paroxetine hydrochloride 1/2-hydrate being not colored in pink can be allowed to separate out in the presence of hydrogen chloride when crystals of paroxetine hydrochloride 1/2-hydrate are allowed to separate out in water or a water-containing polar organic solvent.
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