Method for producing n-propyl acetate and method for producing allyl acetate
View Patent ↗Provided is a method for producing n-propyl acetate, which is capable of obtaining high-purity allyl acetate with a low amount of coexisting water and is capable of producing n-propyl acetate with a high yield. The method includes an extraction process of subjecting a raw material liquid containing allyl acetate and water to an extraction operation using water as an extraction solvent and separating the extract into an oily phase and an aqueous phase, a distillation process of distilling the oily phase to obtain a distillate containing allyl acetate as a main component, and a hydrogenation process of subjecting the distillate to a hydrogenation reaction.
1. A method for producing n-propyl acetate, comprising:
a first oil-water separation process of separating a raw material liquid containing allyl acetate, water and acetic acid into an oily phase (A) and an aqueous phase (A);
an extraction-separation process of subjecting the oily phase (A) to an extraction operation using water as an extraction solvent and separating the extract into an oily phase (B) containing allyl acetate as a main component and an aqueous phase (B) containing water as a main component;
a first distillation process of distilling the oily phase (B) to obtain a distillate (X) containing allyl acetate as a main component;
a second oil-water separation process of separating the distillate (X) into an oily phase (C) and an aqueous phase (C);
a second distillation process of distilling the oily phase (C) to obtain a distillate (Y) containing allyl acetate as a main component; and
a hydrogenation process of subjecting the distillate(Y) to a hydrogenation reaction,
wherein the concentration of water (by mass) in distillate (Y) for use in the hydrogenation reaction is 100 ppm or less.
2. The method for producing n-propyl acetate according to claim 1 , wherein the aqueous phase (C) is returned to the first distillation process.
3. The method for producing n-propyl acetate according to claim 1 , comprising:
a third distillation process of further distilling the distillate (Y) between the second distillation process and the hydrogenation process.
4. The method for producing n-propyl acetate according to claim 1 , comprising:
a process for preparing a raw material liquid, for preparing the raw material liquid by an oxidative carboxylation reaction using propylene, acetic acid and oxygen gas as raw materials, before the extraction process.
5. The method for producing n-propyl acetate according to claim 1 , wherein a catalyst including at least one selected from platinum, palladium, rhodium, ruthenium and nickel is used in the hydrogenation reaction.
6. A method for producing allyl acetate, comprising:
a reaction process of carrying out an oxidative carboxylation reaction using propylene, acetic acid and oxygen gas as raw materials;
a first oil-water separation process of separating the reaction mixture obtained in the reaction process into an oily phase (A) and an aqueous phase (A);
an extraction-separation process of subjecting the oily phase (A) to an extraction operation using water as an extraction solvent and separating the extract into an oily phase (B) containing allyl acetate as a main component and an aqueous phase (B) containing water as a main component;
a first distillation process of distilling the oily phase (B) to obtain a distillate (X) containing allyl acetate as a main component;
a second oil-water separation process of separating the distillate (X) into an oily phase (C) and an aqueous phase (C); and
a second distillation process of disting the oily phase (C) to obtain a distillate (Y) containing allyl acetate as a main component,
wherein the concentration of water (by mass) in the distillate (Y) is 100 ppm or less.
7. The method for producing n-propyl acetate according to claim 2 , comprising:
a third distillation process of further distilling the distillate (Y) between the second distillation process and the hydrogenation process.
8. The method for producing n-propyl acetate according to claim 2 , comprising:
a process for preparing a raw material liquid, for preparing the raw material liquid by an oxidative carboxylation reaction using propylene, acetic acid and oxygen gas as raw materials, before the extraction process.
9. The method for producing n-propyl acetate according to claim 2 , wherein a catalyst including at least one selected from platinum, palladium, rhodium, ruthenium and nickel is used in the hydrogenation reaction.