需要解决的问题:有效地和稳定地从含有丙烯酸二聚体和来自精馏塔高沸点杂质马来酸的丙烯酸混合物中分离出丙烯酸。在生产丙烯酸的过程中,粗丙烯酸含有丙烯酸二聚体和马来酸,特别是来自丙烯和/或丙烯醛气相催化氧化步骤中的丙烯酸,捕集丙烯酸形成丙烯酸水溶液,丙烯酸的共沸分离步骤是从共沸蒸馏丙烯酸水溶液中分离回收丙烯酸,高沸点杂质的纯化步骤是在高沸点杂质分离塔中除去杂质今儿收集丙烯酸。 Problem to be solved: Acrylic acid is efficiently and stably separated from an acrylic mixture containing acrylic acid dimer and maleic acid, which is a high-boiling impurity from the rectifying tower. In the production of acrylic acid, the crude acrylic acid contains acrylic acid dimer and maleic acid, especially acrylic acid from the propylene and / or acrolein gas phase catalytic oxidation step, trapping acrylic acid to form an aqueous acrylic acid solution, the azeotropic separation step of acrylic acid is Acrylic acid is separated and recovered from the azeotropic distillation acrylic acid aqueous solution. The purification step of high-boiling impurities is to remove the impurities in the high-boiling impurities separation tower to collect the acrylic acid.