本发明公开了一种醋酸生产装置中混合废酸的利用方法,它包括以下步骤:(1)将废酸物料通过泵打入到降膜蒸发器中蒸发,得到醋酸和丙酸蒸汽,将醋酸和丙酸蒸汽冷凝,然后将冷凝液送入受液槽;(2)将醋酸和丙酸冷凝液从受液槽泵入反应器,然后 The invention discloses a method for utilizing mixed waste acid in an acetic acid production device, which comprises the following steps: (1) sending waste acid material into a falling-film evaporator through a pump and evaporating to obtain acetic acid and propionic acid vapor, And propionic acid vapor condensate, and then the condensate into the receiving tank; (2) the acetic acid and propionic acid condensate from the liquid tank pumped into the reactor, and then