Study On Separation Of The Products Of Hydrogenation Of Ethyl Acetate To Manufacture Ethanol

Ethanol is an important part of chemical raw materials. With the high price of ethanol and continued low price of ethyl acid, Huayi Technology Institute have proposed a new manufacturing route with ethyl acid as the raw material by hydrogenation of ethyl acetate. And my task is to separate the product of hydrogenation of ethyl acetate,and to propose industrial scale-up plan for the separation process via proceedings and results of laboratory and pilot-plant experiments.Firstly, NRTL equation is chosen as the most suitable vapor-liquid model fitted with hydrogenation products of ethyl acetate according to ethanol-ethyl acetate, ethanol-ethyl acetate-water VLE data. Then hydrogenation products of ethyl acetate are sorted into A, B, C and D based on lumping principle according to volatilities in light of national standards of ethanol and practical demands. The optimum separation process, AB/CDâ†'C/Dâ†'A/B,which costs1823kJ/kg and possesses the total recovery ratio of95.5%, thus can be calculated using iteration optimization method on Aspen Plus. Later, under the guidance of the optimum separation process, de-light and de-heavy distillation experiments, of which the total recovery ratio is92.38%, are performed to study the effects of reflux ratio R and output ratio D/F on composition of the products.The experiment results are fundamentally identical with those of Aspen Plus simulation. Then industrial plants are studied in this paper to obtain design and operation parameters of de-light component, de-heavy component and recycling distillation towers. Based on the parameters of industrial plants, de-heavy component and recycling distillation towers, in the form of sieve plate tower, are designed and verified in hydrodynamics consequently, which conclude:The diameters of the three column are1.6m,1.6m,0.5m, respectively; The height of the three columns are46.9m,21.7m,25.9m, respectively; The hydrodynamical verification indicates that the towers are all qualified for the verification criteria and possess reasonable operation flexibility.