Study On Thermodynamics And Kinetic Of FCC Light Gasoline Etherification System

FCC light gasoline contains a large number of olefins, light gasolineetherification process can change part of the olefins into ethers with low vaporpressure, high octane number and high oxygen contents so that it can reduce the olefincontents in gasoline and vapor pressure and to improve the stability and octanenumber of gasoline. At present, with the improvement of the environmental protection,reducing the olefin contents in gasoline is a necessary way to produce clean gasoline,so it is very necessary to design and develop the light gasoline etherification process.The thermodynamic data (particularly the vapor-liquid equilibrium data) and kineticdata are the theoretical basis of the design and development of the light gasolineetherification.In this study the isothermal vapor-liquid data of methanol(1)+2,3-dimethyl-1-butene binary system at343.06K,353.27K,363.19K,372.90K andmethanol(1)+2,3-dimethyl-2-butene binary system at343.15K,353.15K,363.15K,372.15K were measured with a circulation equilibrium still. Three activity coefficientmodels including Wilson、 NRTL and UNIQUAC were used to correlate theexperimental vapor-liquid equilibrium data of the two binary system at differenttemperatures. The pressure and composition deviation between the experimental dataand the model prediction data and the binary interaction parameters of the two binarysystems with different models were given in this study. The azeotropic data of the twosystems at different temperatures were also provided.In this paper, the thermodynamic and kinetic of the TAME synthesis reactionwere also studied at338.15K~358.15K with the methanol and tert-pentene materialand D005acidic cation exchange resin catalyst. The reaction equilibrium constantsand the influence of the ratio of methanol and tert-pentene, temperature and reflux onthe etherification reaction were provided. The macrokinetic model was applied tocorrelate the experimental data and the reaction rate constants at differenttemperatures were achieved. The reaction and pre-experimental factors of the reactionwere achieved by the regression analysis. Catalytic reaction distillation is a processwhere chemical reaction and distillation separation occur simultaneously. To satisfythe need of TAME production with this process in industry and to study the relationbetween reaction and distillation, the vapor-liquid equilibrium data of the reactive system methanol+tert-pentene at338.15K,348.15K,358.15K were measured andthe Wilson, NRTL, UNIQUAC activity coefficient models were used to correlate theexperimental data and the binary interaction parameters of the reactive system weregiven in this study.