Study on Synthetic Technology of Ethyl Acrylate Production by Liquid Phase Continuous Method
In recent years,ethyl acrylate related industries mostly use gas phase fixed bed,the method of high energy consumption,large equipment investment,production switching is not convenient,a-crylic acid one-way conversion rate is low,high production cost a series of problems,therefore,this experiment studied a liquid phase continuous production of ethyl acrylate synthesis process to solve the above problems.Ethyl acrylate was synthesized from acrylic acid and 95％ethanol by liquid phase continuous method.Its structure was characterized by 1H NMR,13 C NMR and MSI(EI).The effects of reaction temperature,residence time,95％ethanol dosage,catalyst mass fraction and extractant dosage on liquid phase continuous production of ethyl acrylate were studied.The results showed that:Under the conditions that acrylic acid is 1 equivalent,95％ethanol is 2 equivalent,the reaction tem-perature of the first stage reactor is 75 ℃,the reaction temperature of the second stage reactor is 80 ℃,the reaction temperature of the third stage reactor is 90 ℃,the reaction residence time is 4 h,the amount of catalyst is 1％of the mass of acrylic acid,and the extraction liquid mass is 1.0∶2.0,the yield of ethyl acrylate reaches 95.0％.The yield of ethyl acrylate was 95.3％after industrial amplifi-cation.The above research solves a series of defects of the gas phase fixed bed method to a certain ex-tent,and provides an excellent production method for the industrial production of ethyl acrylate.
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