Method of separating the acrylic acid from benzoic acid contained in the product gas mixture from a heterogeneously catalyzed gas phase partial oxidation of a C3-precursor compound of acrylic acid

摘要

Separating acrylic acid from a product gas from the gas-phase oxidation of a C 3 precursor on a heterogeneous catalyst comprises transferring acrylic acid and benzoic acid into a liquid phase P, stripping off low boilers to give a liquid phase P* with an acrylic acid content C of at least 80 wt.% and a benzoic acid content of at least 0.01% of C, and crystallizing acrylic acid from liquid phase P*.