abstract |
The invention relates to a method for producing acrylic acid-based water-absorbent resins. Crude acrylic acid is first isolated from the reaction gases of the catalytic gas phase reaction of propane, propene, and/or acrolein. Said crude acrylic acid is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid. The pure acrylic acid can then be immediately subjected to radical polymerisation. |