Process and apparatus for the purification of a resorbable...

Details Process and apparatus for the purification of a resorbable... Process and apparatus for the purification of a resorbable...

C - Chemistry, Metallurgy

08

G

C08G 63/90 (2006.01) C08L 63/08 (2006.01)

Patent

CA 2686045

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.

L'invention concerne un procédé de nettoyage d'un polyester résorbable, selon lequel le polymère est dissous dans un premier solvant (12), la solution de polymère étant ensuite amenée en contact intime avec un deuxième solvant (41) en exerçant des forces élevées de cisaillement dans un champ de cisaillement turbulent. Le deuxième solvant (41) ne dissout pas le polyester résorbable et est miscible de manière illimitée avec le premier solvant (12). Ensuite, la suspension de polymère obtenue par addition du deuxième solvant (41) est transportée sur ou dans un corps cylindrique rotatif de tamis (71) d'un tamis cisaillant (70) à tambour, et la masse polymère humide est ensuite séparée du corps de tamis (71) pour ensuite être séchée. Le procédé convient pour fabriquer des polyesters résorbables de haute qualité et peut être exécuté économiquement même à échelle industrielle.

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