Process for the preparation of trimethylene terephthalate...

C - Chemistry – Metallurgy – 07 – C

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C07C 67/08 (2006.01) C07C 69/82 (2006.01) C08G 63/183 (2006.01) C08G 63/78 (2006.01)

Patent

CA 2501346

A process that can be used for direct esterification of a dicarboxylic acid such as terephthalic acid with a glycol such as 1,3-propanediol. The process comprises (1) contacting, at an elevated temperature, optionally in the presence of a preformed oligomer, the acid with the glycol to produce a product mixture comprising (i) a water-glycol vapor mixture, which or a portion of which exits the product mixture at the temperature to form a water- glycol vapor mixture and (ii) a liquid product mixture comprising an oligomer having a degree of polymerization of from about 1.9 to about 3.5 and comprising repeat units derived from the acid; (2) separating the glycol from the water-glycol mixture to produce a recovered glycol; and (3) returning the recovered glycol to the product mixture such that the liquid product mixture comprises an excess free glycol.

Procédé d'estérification directe d'un acide dicarboxylique, par exemple un acide téréphtalique, avec un glycol tel qu'un 1,3-propanediol. Ce procédé consiste à: (1) mettre en contact, à haute température, et éventuellement en présence d'un oligomère préformé, l'acide avec le glycol de manière à obtenir un produit de mélange comprenant (i) un mélange eau-glycol en phase vapeur, lequel quitte en partie ou en totalité le produit de mélange à la température de formation du mélange eau-glycol en phase vapeur et (ii) un mélange liquide comprenant un oligomère dont le degré de polymérisation est compris entre 1,9 et 3,5 environ et qui renferme des unités de répétition dérivées de l'acide; (2) séparer le glycol du mélange eau-glycol pour obtenir un glycol de récupération; et (3) rajouter le glycol de récupération au produit de mélange de telle sorte que ledit mélange contienne du glycol excédentaire libre.

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