本发明涉及一种醋酸加氢制备乙醇的方法,主要解决现有技术中乙醇选择性低的问题。本发明通过采用一种醋酸加氢制备乙醇的方法,以醋酸原料分两股或多股进入各加氢反应段,各反应段间醋酸液相或部分液相进料,有效的控制了酸加氢反应器催化剂床层温升,起直接换热降温和补充原料的作用,使每个反应区较高氢酸比的情况下极大幅度的降低整个醋酸加氢反应系统的氢酸比,保证了较高乙醇选择性的技术方案较好地解决了上述问题,可用于醋酸加氢制备乙醇中。 The invention relates to a method for preparing ethanol by hydrogenation of acetic acid, which mainly solves the problem of low selectivity of ethanol in the prior art. In the invention, a method for preparing ethanol by hydrogenation of acetic acid is adopted, the acetic acid raw material is divided into two or more strands into each hydrogenation reaction section, the acetic acid liquid phase or part of the liquid phase is fed between the reaction sections, and the acid addition Hydrogen reactor catalyst bed temperature rise from the direct heat transfer cooling and replenishment of the role of raw materials, so that each reaction zone of high hydrogen to acid ratio greatly reduces the hydrogenation ratio of acetic acid hydrogenation reaction system to ensure that A higher ethanol selectivity of the technical solutions to better solve the above problems can be used for the hydrogenation of acetic acid in ethanol.