Continuous preparation of 5-formylvaleric esters in pure form

Details Continuous preparation of 5-formylvaleric esters in pure form Continuous preparation of 5-formylvaleric esters in pure form

C - Chemistry, Metallurgy

07

C

C07C 69/716 (2006.01) C07C 67/54 (2006.01)

Patent

CA 2225649

The production of 5-formyl valeric acid ester with a yield of not less than 90 % by the distillation of a mixture of 5-formyl valeric acid ester and either 3 or 4-formyl valeric acid ester or a mixture of 3 and 4-formyl valeric acid esters, in which the ester radicals of the formyl valeric acid esters are identical, by separating the 3 or 4-formyl valeric acid esters of their mixtures from the 5-formyl valeric acid ester at a pressure between 2 and 100 mbar and a temperature not exceeding 150 ~C (measured as the column well temperature) in a distillation column, and using the corresponding ethyl or ethyl ester as the esters, and in which the purity of the 5-formyl valeric ester is no lower than 98 % and 4-formyl valeric acid ester is present as an impurity in a quantity of no more than 100 ppm.

On prépare l'ester d'acide formylvalérique-5 avec un rendement d'au moins 90 % par distillation d'un mélange d'esters d'acide formylvalérique constitué d'ester d'acide formylvalérique-5 et d'ester d'acide formylvalérique-3 ou 4 ou d'un mélange d'esters d'acide formylvalérique-3 et 4, les restes esters des esters d'acide formylvalérique étant identiques. On sépare les esters d'acide formylvalérique-3 ou 4 ou leurs mélanges de l'ester d'acide formylvalérique-5 dans une colonne de distillation à une pression comprise entre 2 et 100 mbars et à une température qui ne dépasse pas 150 ·C (mesurée au fond de la colonne). On utilise comme esters les esters correspondants de méthyle ou d'éthyle. La pureté de l'ester d'acide formylvalérique-5 obtenu n'est pas inférieure à 98 % et contient comme impureté une quantité d'ester d'acide formylvalérique-4 qui ne dépasse pas 100 ppm.

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