Liquid-liquid Extraction Separation Of Ethyl Acetate - Ethanol - Water

The properties, applications and all kinds of production methods of ethyl acetate were summarized. The recent methods of separating ethyl acetate-ethanol-water aqueous solution were also reviewed. A new method of liquid-liquid extraction was used to separate ethyl acetate-ethanol-water mixed solution in this thesis.Glycerol was chosen as the extracting agent to separate the ethyl acetate-ethanol-water mixed solution according to the theoretical analysis and experimental study. The effect of process parameters, such as the stirring time, stirring velocity and setting time were investigated and the optimum operation parameters were achieved. On the basis of the optimum operation parameters, the liquid-liquid equilibrium data of ethyl acetate-water, ethyl acetate-glycerol, ethyl acetate-water-glycerol, ethyl acetate-ethanol-glycerol, ethyl acetate-ethanol-water and ethyl acetate-ethanol-water-glycerol were tested. The interactive parameters of UNIQUAC were correlated by the method of least square and the binary, tribasic and quaternary LLE data were simulated. The results showed that UNIQUAC equation had the minor relative error.The effect of cross-current extraction process parameters, such as solvent ratio, rotate speed, stirring time, setting time and extraction progression on ethyl acetate-ethanol-water-glycerol separation had been investigated. The results showed that the optimum operation parameters were as follows:solvent ratio (VS/VF) was 1:1, rotate speed was 650r/min, stirring time was 30min, settling time was 30min. Under the optimized parameters, The content of ethyl acetate exceeded 99.6% through the three-stage of cross-current extraction. On the basis of the cross-current extraction, the effect of counter-current extraction process parameters, such as solvent ratio, stirring velocity, and feed rate had been investigated. The results showed that the optimum operation parameters were as follows:rotate speed was 650r/min, solvent ratio was 1.25:1, feed rate was l.Oml/min. Under the optimized parameters, The content of ethyl acetate exceeded 98.6% through the four-stage of counter-current extraction. The experimental results of cross-current extraction and counter-current extraction were compared with the simulation data of UNIQUAC equation by the method of phase distribution coefficient and the results showed a minor deviation.The method of separating ethyl acetate in this paper was simple and the energy consumption of the refining process is low. The results had provided base data in detail for further research in purifying ethyl acetate.