Method for recovering acrylic acid from acrylic acid water

The invention discloses a method for recovering acrylic acid from acrylic acid water, which comprises the following steps: introducing acrylic acid water into an extraction tower, adding an extractant, and operating the extraction tower under the conditions of normal pressure and temperature, wherein the weight ratio of the acid water to the extractant is 1:0.5-1:1; and extracting the organic phase from the acid water in the extraction tower, and carrying out distillation concentration treatment to obtain the byproduct acrylic acid, wherein the distillation concentration treatment adopts single-tower continuous rectification and uses a siphoning-type reboiler, and steam is used as a heat source. The adopted extractant has high extraction efficiency, and the extracted organic phase has higher concentration and is beneficial to concentration; the extractant has low enthalpy value, and the energy consumption is low in the rectification process and is less than one half of that of the original azeotropic concentration technique; the wastewater after extraction can be subjected to biochemical treatment and discharged after reaching the standard; and the final byproduct acrylic acid is waterless, the quality index satisfies the esterification-grade requirements, and the acrylic acid can be used for producing butyl acrylate and other products and has obvious price advantage.