Study Of Gas-phase Catalytic Hydrogenation Of Acetic Ester To Ethanol

The process of producing ethanol with an indirect raw material of acetic acid can relieve the overcapacity of acetic acid industry, and it is suitable for Chinese energy structure. This paper studied the reaction of methyl acetate hydrogenation to ethanol with Cu catalyst. A good catalyst was selected; the effect of reaction conditions to the conversion of methyl acetate and the selectivity of ethanol was discussed in an isothermal reactor; the kinetic equation was built.The conversion of methyl acetate reached98.8%at225℃over Cu-Mn-Al catalyst which was good. The experimental conditions were170℃-250℃of temperature,2MPa-6MPa of pressure,0.1h-1-0.9Ph-1of the mass velocity of liquid methyl acetate,20-200of the mole ratio of hydrogenation to methyl acetate. The results indicated that higher conversion and selectivity could be obtained in the conditions of higher temperature and pressure, the conversion of methyl acetate was99.3%at210℃; With the increase of the mass velocity, the conversion of methyl acetate dropped slowly while the selectivity of ethanol had a trend to rise; improving the mole ratio of hydrogenation to methyl acetate, the conversion of methyl acetate increased while the selectivity of ethanol had a trend to drop. According to the data of orthogonal experimental, the parameters involved the Langmuir-Hinshelwood model was got by the parameter estimation method. The residual error distribution and statistical tests show that the intrinsic kinetics was appropriate.