本发明涉及到从甲醇和醋酸生产丙烯酸的过程,其中在反应区A,甲醇在非均相催化剂气相反应中部分氧化成甲醛,由此得到的产品气体混合物A和醋酸源用于制备含有醋酸和甲醛,并且醋酸相对甲醛过量的反应气体输入混合物B;在反应区B,反应气体混合物B中的甲醛和醋酸,在非均相催化剂下进行羟醛缩合反应生成丙烯酸,未反应醋酸与丙烯酸目标产物一起存在于产品气体混合物B中, The present invention relates to a process for producing acrylic acid from methanol and acetic acid in which methanol is partially oxidized to formaldehyde in a heterogeneous catalyst gas phase reaction in reaction zone A and the product gas mixture A and the acetic acid source thus obtained are used for the preparation of an aqueous solution containing acetic acid and Formaldehyde and acetic acid relative to the excess amount of formaldehyde into the reaction mixture B; in the reaction zone B, the reaction gas mixture B of formaldehyde and acetic acid under heterogeneous catalyst aldol condensation reaction of acrylic acid, unreacted acetic acid and acrylic acid target product Exist together in the product gas mixture B,