Two-step method for dehydrating plastic dispersions

Details Two-step method for dehydrating plastic dispersions Two-step method for dehydrating plastic dispersions

B - Operations, Transporting

29

B

B29B 15/04 (2006.01) B29C 47/00 (2006.01) B29C 47/50 (2006.01) B29C 47/76 (2006.01) C08F 6/00 (2006.01) C08F 6/22 (2006.01) C08J 3/16 (2006.01)

Patent

CA 2288803

The invention relates to a method for dehydrating a two-phase liquid mixture consisting of a thermoplastic synthetic melt phase and an acqueous phase, comprising the following steps: a) coagulation of the two- phase liquid mixture in a first extruder; b) dehydration of the coagulate in a twin screw extruder with a de-watering zone and screws working in an opposite direction; c) separation of constituents by degasifying. The inventive method is characterized in that a single screw extruder or a twin screw extruder with screws working in the same direction is used as a first extruder in step a).

L'invention concerne un procédé permettant d'extraire l'eau contenue dans un mélange liquide à deux phases, comprenant une matière plastique en fusion et une phase aqueuse, par a) coagulation du mélange liquide à deux phases dans une première extrudeuse; b) extraction de l'eau contenue dans le coagulat dans une boudineuse à deux vis, à vis contraires avec une zone d'extraction d'eau et c) séparation de constituants volatils par dégazage. Ce procédé se caractérise en ce qu'au cours de l'étape a), la première extrudeuse utilisée est une boudineuse à une vis ou une boudineuse à deux vis, à vis placées dans le même sens.

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