Continuous polyester process

Details Continuous polyester process Continuous polyester process

C - Chemistry, Metallurgy

08

G

C08G 63/181 (2006.01) C08G 63/78 (2006.01)

Patent

CA 2174312

An atmospheric pressure process for the continuous production of polyester is disclosed wherein a melt of dihydroxy ethyl terephthalate, or its low molecular oligomers, obtained by esterifying terephthalic acid or transesterifying dimethyl terephthalate with ethylene glycol, is intimately contacted with an inert gas to facilitate polymerization and removal of the reaction by-products. The ethylene glycol evolved and the inert gas are recycled.

L'invention concerne un processus de production continue du polyester sous pression atmosphérique. Le processus consiste à créer un contact intime entre, d'une part du dihydroxy éthyle téréphthalate (ou ses oligomères de poids moléculaire inférieur) obtenus par estérification de l'acide téréphtalique ou par transestérification du diméthyle téréphthalate au moyen d'éthylène glycol, et d'autre part un gaz inerte susceptible de provoquer la polymérisation et d'éliminer les sous-produits de la réaction. L'éthylène glycol s'évapore, et les gaz inertes sont recyclés.

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