The Study On The Catalyst Of Hydrogenation Of Acetic Acid To Ethanol And Ethylacetate

The market application of ethyl acetate and ethanol is very wide.Ethanol is a clean source of energy which is renewable,non polluting,high octane,so ethanol is often used as a gasoline additive.Adding a certain amount of ethanol to gasoline fuel can provide the same energy as pure gasoline fuel can produce.,In addition,the products of ethanol combustion is water and carbon dioxide,which is hardly produce the pollutants harm the environment.At present,the energy crisis is one of the world biggest problem for all countries,and if we solved the energy crisis,we would obtain the development and promotion of international position.Development country like the United States and Brazil carried out fuel ethanol policies firstly.Using ethanol as fuel additives can relieve the shortage of petroleum energy crisis effectively.Chinese industrial ethanol demand is approximately 3 million tons per year currently,automotive fuel ethanol occupies a large proportion.It is estimated that China will demand ethanol exceed 15 million tons by 2017.The application field of ethanol has been out of the original areas.The original areas include food,medicine,chemical industry,national defense areas,and automotive fuel ethanol market will become the new domain of alcohol use in the future market.Ethyl acetate is used widely,for example,it can be used to produce ethyl acetate coatings,inks,adhesives and other products.In 2010,China's apparent consumption of ethyl acetate was 817 thousand tons,in 2013,the apparent consumption of ethyl acetate was 1 million 28 thousand and 500 tons,had an about 7.25% increase.This shows the market demand of ethyl acetate is large in China.In this paper,the production process of ethanol and ethyl acetate byone-step hydrogenation of acetic acid was studied.The bimetallic supported catalyst is prepared by impregnation method,characterized by XRD,BET and H2-TPR method to interpret the nature of the catalyst in the fixed bed reactor,and examines the effect of different process conditions on the catalytic performance.The experimental results show,when the reaction temperature260?,reaction pressure 3.5MPa,ratio of H2/CH3 COOH 35,LHSV 1.0 h-1,the one-way conversion of acetic acid is up to 98.97%,the selectivity of ethanol is79.29% and selectivity of ethyl acetate is 20.28%.For the target product,in total selectivity of ethanol and ethyl acetate can be up to 99.57%.The XRD diffraction peak of 1Pt/?-Al₂O₃,1Sn/?-Al₂O₃,1Pt-1Sn/?-Al₂O₃,1Pt-1.25Sn/?-Al₂O₃,1Pt-1.5Sn/?-Al₂O₃,1.5Pt-1Sn/?-Al₂O₃,1.25Pt-1Sn/?-Al₂O₃ and 0.75Pt-1Sn/?-Al₂O₃ Catalyst and catalyst carrier is no obvious different.With the addition of active component,the surface area,the pore volume and average pore diameter of the catalyst has a tendency to reduce.In addition,with the addition of additives,the main metal dispersion on support is increased,the performance of the catalyst is also improved.Combine catalyst activity evaluation data and characterization results can be learned,Pt-Sn Ox compounds can activate carbonyl and hydrogen evidently and Pt-Sn Ox compounds is also beneficial to the generation of ethanol and ethyl acetate by hydrogenation of acetic acid.