Patent ID: 8308913

Claim:
An apparatus for recovering an acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, which comprises: a separation column for removing the impurities with high boiling point from the mixture; an acrylic acid recovering device that comprises a thin film evaporator disposed at an upper part of the acrylic acid device and being integrated with an acrylic acid dimer pyrolysis tank disposed at a lower part of the acrylic device, wherein the thin film evaporator and the acrylic acid dimer pyrolysis tank are configured to operate at the same pressure under reduced pressure; a line for introducing the mixture into the acrylic acid recovering device; and a line for recovering the acrylic acid by distillation from the top of the acrylic acid recovering device, wherein the pyrolysis of the acrylic acid dimer and the vaporization of the acrylic acid are carried out in the acrylic acid recovering device.