Process for producing high-purity bis-.beta.-hydroxyethyl...

C - Chemistry – Metallurgy – 07 – C

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C07C 67/26 (2006.01) C07C 67/54 (2006.01) C07C 67/56 (2006.01) C08J 11/10 (2006.01) C07C 69/82 (2006.01)

Patent

CA 2395061

A process for production of high-purity bis-.beta.-hydroxyethyl terephthalate, which comprises the step (1) of esterifying crude terephthalic acid with ethylene glycol and/or ethylene oxide to obtain a reaction product containing bis-.beta.-hydroxyethyl terephthalate, the step (2) of converting the reaction product formed in the step (1) into a solution of bis-.beta.-hydroxyethyl terephthalate (solute) in ethylene glycol (solvent), if necessary, with additional ethylene glycol, and then removing ions from the solution to form a deionized solution, the step (3) of distilling the deionized solution formed in the step (2) to recover crude bis-.beta.-hydroxyethyl terephthalate with low-boiling matter distilled away, and the step (4) of subjecting the crude bis-.beta.-hydroxyethyl terephthalate obtained in the step (3) to molecular distillation to recover bis-.beta.-hydroxyethyl terephthalate as distillate.

L'invention se rapporte à un procédé de production de téréphtalate de bis-.beta.-hydroxyéthyle de grande pureté, qui consiste (1) à estérifier de l'acide téréphtalique brut avec de l'éthylène glycol et/ou de l'oxyde d'éthylène de manière à obtenir un produit de réaction contenant du téréphtalate de bis-.beta.-hydroxyéthyle (soluté) dans l'éthylène glycol (solvant), si nécessaire, avec un supplément d'éthylène glycol, et à supprimer les ions de la solution de manière à former une solution déionisée, (3) à distiller la solution déionisée formée à l'étape (2) de manière à récupérer du téréphtalate de bis-.beta.-hydroxyéthyle brut dans lequel la matière à faible point d'ébullition a été extraite par distillation, et (4) à soumettre le téréphtalate de bis-.beta.-hydroxyéthyle brut obtenu à l'étape (3) à une distillation moléculaire de manière à récupérer du téréphtalate de bis-.beta.-hydroxyéthyle sous forme de distillat.

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