Process for separating cyclohexane dimethanol from dimethyl...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/82 (2006.01) C07C 67/03 (2006.01) C07C 67/52 (2006.01) C07C 67/54 (2006.01)

Patent

CA 2173991

Provided is a method useful for separating and removing impurities such as cyclohexane dimethanol (CHDM) and other additives from their mixture with dimethylterephthalate (DMT), formed during a depolymerization process such as methanolysis of poly(ethylene terephthalate) (PET), poly(cyclohexyldimethylene terephthalate) (PCT), or copolymers of PET and PCT. The separation and removal of CHDM is accomplished via either melt or solution crystallization of the DMT following excess methanol removal (via distillation) of the methanolysis reactor products.

L'invention concerne un procédé utile pour la séparation et l'extraction d'impuretés telles que le diméthanol de cyclohexane et d'autres additifs de leur mélange avec du diméthyltéréphtalate formés au cours d'un procédé de dépolymérisation tel que la méthanolyse du poly(éthylène-téréphtalate) (PET), du poly(cyclohexyldiméthylène téréphtalate) (PCT) ou de copolymères de PET et de PCT. La séparation ou l'extraction du diméthanol de cyclohexane s'effectue par cristallisation en fusion ou en solution du diméthanol consécutivement à l'extraction du méthanol excédentaire (par distillation) des produits du réacteur de méthanolyse.

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