Composite Extractive Distillation Separation Of Ethyl Acetate - Ethanol - Water

The recent processes of separation ethyl acetate-ethanol-water mixture were reviewed in this paper. Azeotropic distillation , membrane separation , liquid-liquid extraction, extractive distillation processes were studied and discussed. On the basis of predecessors , the composite extractive distillation was put forward first by which high purity ethyl acetate can be obtained one time .The interaction of solvents , ethyl acetate , ethanol and water were studied in detail, relative volatility of ethyl acetate / ethanol and ethyl acetate /water were tested under different solvents. Combined with other influencing factors , water was selected as extractive agent for ethyl acetate-ethanol system and glycerol for ethyl acetate-water system.The infinite activity coefficients of ethyl acetate, ethanol and water in glycerol were measured by the gas chromatography, and the binary model parameters of ethyl acetate-glycerol, ethanol-glycerol, water-glycerol were correlated by the single parameter method.VLE data of ethanol-water, ethyl acetate-ethanol and ethanol-ethyl acetate-water, ethanol-water-glycerol, ethyl acetate-ethanol-glycerol and ethanol-ethyl acetate-water-glycerol were tested by the simple single equilibrium caldron .The interactive parameters of Wilson, UNIQUAC, NRTL, Margules, Van Laar equation were correlated by the method of Minimum Variance .The results showed that Wilson equation had the minor absolute error. Diagram of two phases system simulation calculation, Diagram of three phases system simulation calculation and Diagram of four phases system simulation calculation were given , the binary , ternary and quaternary VLE data were simulated according to interactive parameters. The results of calculation data were coincided with experiment data, and provided basic data for the separation calculation of ethyl acetate-ethanol-water.The paper can provide theoretical basis and industrial produce for the simulation and calculation of composite extractive distillation and further studies on experiments.