Closely linking a nda process with a pen process

Details Closely linking a nda process with a pen process Closely linking a nda process with a pen process

C - Chemistry, Metallurgy

07

C

C07C 51/265 (2006.01) B01J 27/232 (2006.01) C07C 51/02 (2006.01) C07C 51/15 (2006.01) C07C 51/41 (2006.01) C07C 51/42 (2006.01) C07C 51/43 (2006.01) C07C 51/47 (2006.01) C07C 51/487 (2006.01) C07C 63/36 (2006.01) C07C 63/38 (2006.01) C08G 63/189 (2006.01)

Patent

CA 2383229

Disclosed is a method for closely linking a process for producing 2,6- naphthalene dicarboxylic acid (2,6-NDA) with a process for producing polyethylene naphthalate, thus eliminating the need for drying 2,6-NDA, handling solid 2,6-NDA, and optimizing particle size of 2,6-NDA which comprises: a) adding an aqueous slurry of polymer grade 2,6-NDA directly into a process for making PEN, either by directly adding a stream from a 2,6 NDA process into a PEN process, or by adding water to polymer grade 2-6 - NDA prior to adding the resulting slurry to a PEN process; b) removing the slurry water during the first esterification reaction at the same time the water of reaction is removed.

L'invention concerne un procédé permettant d'associer étroitement un procédé de production d'acide 2,6-naphtalène dicarboxylique (2,6-NDA) à un procédé de production de polyéthylène naphtalate, rendant ainsi inutile le séchage de 2,6-NDA, 2,6-NDA à l'état solide, et optimisant la taille de la particule de 2,6-NDA qui comporte : a) l'adjonction d'une suspension aqueuse de 2,6-NDA au stade polymère directement dans un procédé de fabrication de PEN, soit par l'adjonction directe d'un flux, à partir du procédé 2,6 NDA dans un procédé PEN, soit par adjonction d'eau au 2,6 NDA au stade polymère, avant l'ajout de la suspension obtenue, à un procédé PEN; b) retrait de la suspension aqueuse pendant la première réaction d'estérification, simultanément au retrait de l'eau de la réaction.

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