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AssigneeBoehringer Ingelheim Pharma GmbH & Co. KG
InventorsAnja Enderle, Manfred Schmitt
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In a method for cleaning an absorptive polyester, the polymer is dissolved in a first solvent (12) and subsequently the polymer solution is brought into tight contact with a second solvent (41) in a turbulent shear field under the influence of strong shear forces. Here, the second solvent (41) represents a non-solvent for the absorptive polyester and is mixable with the first solvent (12) to an unlimited extent. Subsequently, the polymer suspension resulting from the addition of the second solvent (41) is conveyed onto or into a rotating, cylindrical screen body (71) of a drum shear screen (70) and then the moist polymer mass is removed from the screen body (71) and subsequently dried. The method is suitable for the production of absorptive polyester with a high degree of quality and may be performed in a cost-effective fashion on an industrial scale as well.
A process for purifying a resorbable polyester comprising the steps of:
A purification device for purifying a resorbable polyester that contains as its main components a dissolving vessel (10) in which the polymer is dissolved in a first solvent (12), a separation device for separating a moist polymer mass from a polymer suspension and a dryer (90) for drying the polymer mass, characterised in that the separation device is constructed as a drum shear screen (70) comprising a rotating, cylindrical screen body (71).
Dependencies are inferred from the claim text.