METHODS OF CRYSTAL PRECIPITATION

摘要

A method of precipitating crystals of paroxetine hydrochloride 1/2-hydrate in a water-containing polar organic solvent, which comprises adding water to a solution or suspension of paroxetine hydrochloride in either a water-free polar organic solvent or a solvent containing up to 60 wt.% water to regulate the water content to 70 wt.% or higher and thereby precipitate crystals of paroxetine hydrochloride 1/2-hydrate. Also provided is a method of precipitating crystals of paroxethine hydrochloride 1/2-hydrate in water or a water-containing polar organic solvent, which comprises causing hydrogen chloride to be present in the system to thereby precipitate crystals of paroxetine hydrochloride 1/2-hydrate which have not been colored in pink.