Coproduction Of Ethylene Glycol Diacetate And Sec-Butyl Alcohol By Batch Reactive Distillation

Ethylene glycol diacetate(EGDA)and sec-butyl alcohol(SBA)are essential chemical products.EGDA is an excellent solvent with high boiling point and fine water solubility.SBA is an important chemical intermediate and solvent.The traditional production processes have many problems,such as serious equipment corrosion,side effects,environment pollution and so on.In this paper,coproduction of EGDA and SBA by transesterification of sec-butyl acetate(SBAC)with ethylene glyco(EG)in a batch reactive distillation column is researched,which overcomes the shortcomings of traditional synthesis methods.The main research content is as follows :Firstly,the kinetic of transesterification of EG and SBAC was studied in a batch reactor with sodium methoxide as catalyst.The effects of stirring rate,catalyst content,molar ratio of raw materials and reaction temperature on the reaction rate were researched.The pseudo homogeneous kinetic model was used to correlate the kinetic parameters.The model is verified by strict statistics.And the results show that the model is highly significant.Secondly,batch reactive distillation experiments were carried out in a reactive distillation column with ? packing.The effects of feed mode,reflux ratio,dosage of catalyst and molar ratio of raw materials on the reaction were investigated.And the appropriate operating condition was obtained: SBAC/EG molar ration 4.5:1,content of catalyst 9.5%(based EG mass),SBAC/EG volume ratio 2:1(molar ratio 0.84:1)mixed feed first,the remaining SBAC was continuously added by pump,feed rate 1h,feed temperature 25?,after total reflus 30 min,recovery with reflux 8,under which the conversion of EG and the yield of EGDA are 90.21% and 98.34%,respectively.Finally,the batch reactive distillation process was simulated by ASPEN PLUS.The result shows that the simulation values are in good agreement with the experimental values.Thus,this model can be used for the simulation of the batch reactive distillation process.The effects of feed rate of SBAC,feed temperature of SBAC,number of theoretical stage,molar ratio of SBAC to EG and reflux ratio on the reaction distillation process were simulated and optimized.