Method for the continuous dehydration of 3-hydroxypropionic acid to form acrylic acid
AssigneeBASF SE
InventorsTim Blaschke, Ortmund Lang, Marta Zajaczkowski-Fischer, Marco Hartmann
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Abstract
The invention relates to a process for dehydrating aqueous 3-hydroxypropionic acid to acrylic acid, wherein an aqueous mixture of 3-hydroxypropionic acid and oligomeric 3-hydroxypropionic acid is converted to acrylic acid in the liquid phase in a first step and aqueous acrylic acid is distilled out of the liquid phase, and the aqueous acrylic acid is separated by distillation into an acrylic acid-rich phase and a water-rich phase in a second step.
Claims12
A process for continuously dehydrating aqueous 3-hydroxypropionic acid to acrylic acid, which comprises, in a first step i), converting an aqueous mixture of 3-hydroxypropionic acid and oligomeric 3-hydroxypropionic acid to acrylic acid in the liquid phase and at a pressure of less than 900 mbar and separating aqueous acrylic acid from the liquid phase by distillation and, in a second step ii), separating the aqueous acrylic acid obtained in step i) at a pressure of less than 900 mbar, by distillation into a crude acrylic acid phase and a water phase.
Dependencies are inferred from the claim text.