Continuous method for the production of polyamides

Details Continuous method for the production of polyamides Continuous method for the production of polyamides

C - Chemistry, Metallurgy

08

G

C08G 69/16 (2006.01) C08G 69/04 (2006.01)

Patent

CA 2555014

Disclosed is a continuous method for producing polyamides, the oligomers or mixtures thereof, optionally with other reaction products, by reacting aminonitriles or dinitriles and diamines or mixtures thereof, optionally along with additional polyamide-forming monomers and/or oligomers, with an aqueous medium comprising aqueous monomer extracts or oligomer extracts which are obtained when extracting the polymer with water during the production of polyamides. Said reaction is carried out in a reactor which has a vertical longitudinal axis and is penetrated essentially in the longitudinal direction. According to the inventive method, water and/or the aqueous medium is/are introduced into the reactor at least at two different points located along the vertical longitudinal axis thereof, the aqueous medium being introduced at least at one point.

L'invention concerne un procédé de production en continu de polyamides, d'oligomères ou de mélanges de ceux-ci, éventuellement avec d'autres produits de réaction, ce procédé consistant à faire réagir des aminonitriles ou dinitriles ou diamines ou des mélanges de ceux-ci, éventuellement conjointement avec d'autres monomères et/ou oligomères formant des polyamides, avec un milieu aqueux constitué d'extraits aqueux de monomères et d'oligomères, lesquels sont produits, lors de la production de polyamides, pendant l'extraction du polymérisat avec de l'eau, dans un réacteur dont l'axe longitudinal est vertical et qui est traversé par un flux sensiblement longitudinal. L'eau et/ou le milieu aqueux sont introduits dans le réacteur en au moins deux points différents placés le long de l'axe longitudinal vertical, le milieu aqueux étant introduit en au moins un point.

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