Patent ID: 7323039
Filing Date: 2008-01-29
Classification: A61K,B01D,B01J,C08J,Y10T

Abstract:
1. An apparatus for the preparation of microspheres by an in-water drying method from an emulsion wherein an organic phase containing an organic solvent having a boiling point lower than that of water and a hardly-water-soluble polymer is emulsified in an aqueous phase, said apparatus comprising: (a) a vessel for holding the emulsion which vessel is equipped with a filter to take out an aqueous portion of the aqueous phase of the emulsion; (b) a gas separation membrane module for evaporating off the organic solvent from the aqueous portion; (c) a circulation pathway which connects the vessel and the gas separation membrane module; and (d) a pump for circulating the aqueous portion through the gas separation membrane module.