Synthèse de L'Acétate D'éthyle


  Synthèse de l'acétate d'éthyle




L'acétate d'éthyle ( ou éthanoate d'éthyle ) est un liquide à odeur caractéristique, utilisé comme solvant des peintures et des vernis.


Mode Opératoire :

Dans un ballon de 250 mL verser successivement :

- 50 mL d'éthanol.

- 60 mL d'acide acétique pur.

- 5 mL d'acide sulfurique concentré.

Adapter un réfrigérant à reflux, et chauffer ainsi pendant 30 minutes. 

Enlever le reflux et mettre le matériel nécessaire à une distillation fractionnée.

Distiller et recueillir les fractions dont le point d'ébullition est inférieur à 100°C.

Transvaser le distillat dans une ampoule à décanter.

Ajouter 50 mL d' une solution saturée de chlorure de sodium. Agiter, décanter. Eliminer la phase aqueuse.

Laver la phase organique avec une solution d'hydrogénocarbonate de sodium à 50g.L- 1 jusqu'à neutralisation. Eliminer la phase aqueuse.

Recueillir la phase organique dans un erlenmeyer de 100 mL contenant du sulfate de sodium anhydre.

Bien agiter. Laisser reposer environ 20 minutes.



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