Abstract: Ethanol was synthesized by using methyl acetate as raw material, and copper-based catalyst (Cu-Zn-Al) was utilized in the hydrogenation process, products were analyzed qualitatively, quantitatively via gas chromatograph. The effects of reaction temperature, reaction pressure, the liquid hourly space velocity(LHSV) of methyl acetate, the molar ratio of hydrogen and methyl acetate and other factors on the conversion rate of feed methyl acetate and the selectivity of target product of ethanol were investigated respectively. The experimental results indicate that the optimal operating parameters are temperature of 240℃, pressure of 8MPa, LHSV of 1h^-1, ratio of hydrogen and methyl acetate of 9:1. Under the optimal condition, the conversion rate of methyl acetate is 95.5%, the selectivity of product ethanol is 94.6%. The equilibrium composition of liquid product is that methanol 38.12%, ethanol 59.52%, methyl acetate 0.86%, and ethyl acetate 1.29%. As is shown by data that Cu-Zn-Al catalyst possesses high activity on carbonyl hydrogenation and good selectivity for ethanol, moreover it can inhibit the production of ethyl acetate.

Key words: methyl acetate, ethanol, hydrogenation, Cu-Zn-Al catalyst

摘要： 以煤基乙酸下游产品乙酸甲酯为原料, 在Cu-Zn-Al催化剂上加氢制取乙醇, 利用气相色谱仪对产品进行定性、定量分析。分别考察了反应温度、反应压力、乙酸甲酯液时空速、氢气与乙酸甲酯摩尔比等操作因素对乙酸甲酯转化率和目标产物乙醇选择性的影响。实验结果表明, 最佳工艺操作参数为:反应温度240℃, 反应压力8MPa, 乙酸甲酯液相体积空速1h^-1, 氢气与乙酸甲酯的摩尔比9:1。在最优工艺条件下, 乙酸甲酯的单程转化率为95.5%, 目的产物乙醇的选择性为94.6%。液体产品的平衡组成为:甲醇38.12%, 乙醇59.52%, 乙酸甲酯0.86%, 乙酸乙酯1.29%。数据表明:在乙酸甲酯加氢制乙醇反应过程中, Cu-Zn-Al催化剂对羰基加氢的活性较高, 对乙醇具有较高的选择性, 同时能够有效抑制主要副产物乙酸乙酯的生成。

关键词: 乙酸甲酯, 乙醇, 加氢, Cu-Zn-Al催化剂