The reaction mechanism of catalytic hydrogenation of rosin was investigated in a high-pressure agitated autoclave(type FYX-2G),using gum rosin as raw material,200# as solvent,and Pd/C as catalyst.When the effects of i...The reaction mechanism of catalytic hydrogenation of rosin was investigated in a high-pressure agitated autoclave(type FYX-2G),using gum rosin as raw material,200# as solvent,and Pd/C as catalyst.When the effects of internal and external diffusion were eliminated,the relationship between reactant concentrations and reaction time was traced on line at temperatures ranging from 130℃ to 160℃ and under pressures ranging from 3.0MPa to 7.0MPa,and the parameters were regressed by using EVIEWS.Based on the experimental results,a suitable reaction model was selected from Hougen-Warson 17 reaction mechanism models to show the reaction between molecules of abietic-type resin acids and atomic hydrogen adsorbed on the catalyst surface.The dissociative adsorption of hydrogen could be the controlling step,the reaction rate is proportional to the pressure of hydrogen and in inverse proportion to the square of concentration of product.The activation energy is 20.773 kJ/mol,and the reason of using solvent in catalytic hydrogenation of rosin was also explained according to the reaction mechanism.展开更多
Neutral fraction in the hydrogenated rosin was separated from acidic fraction by DEAE-Sephadex ion exchange chromatography and the results indicated that the compositions of three products from hydrogenation of rosin ...Neutral fraction in the hydrogenated rosin was separated from acidic fraction by DEAE-Sephadex ion exchange chromatography and the results indicated that the compositions of three products from hydrogenation of rosin catalyzed by nano-Ni,raney-Ni,and Pd/C were consistent basically.The content of tetrahydro resin acids with nano-Ni and Pd/C was higher than that with raney-Ni.The neutral fraction of hydrogenated rosin in hydrogenation of rosin over nano-Ni was mostly consisted of diterpane alcohol and superfatty acid methly ester.The content of dihydroabietic-type resin acids increased rapidly during the process of hydrogenation,but the content of abietic-type resin acids decreased quickly.A great deal of tetrahydroresin adcids was generated druring the catalytic hydrogenation with nano-Ni.展开更多
文摘The reaction mechanism of catalytic hydrogenation of rosin was investigated in a high-pressure agitated autoclave(type FYX-2G),using gum rosin as raw material,200# as solvent,and Pd/C as catalyst.When the effects of internal and external diffusion were eliminated,the relationship between reactant concentrations and reaction time was traced on line at temperatures ranging from 130℃ to 160℃ and under pressures ranging from 3.0MPa to 7.0MPa,and the parameters were regressed by using EVIEWS.Based on the experimental results,a suitable reaction model was selected from Hougen-Warson 17 reaction mechanism models to show the reaction between molecules of abietic-type resin acids and atomic hydrogen adsorbed on the catalyst surface.The dissociative adsorption of hydrogen could be the controlling step,the reaction rate is proportional to the pressure of hydrogen and in inverse proportion to the square of concentration of product.The activation energy is 20.773 kJ/mol,and the reason of using solvent in catalytic hydrogenation of rosin was also explained according to the reaction mechanism.
文摘Neutral fraction in the hydrogenated rosin was separated from acidic fraction by DEAE-Sephadex ion exchange chromatography and the results indicated that the compositions of three products from hydrogenation of rosin catalyzed by nano-Ni,raney-Ni,and Pd/C were consistent basically.The content of tetrahydro resin acids with nano-Ni and Pd/C was higher than that with raney-Ni.The neutral fraction of hydrogenated rosin in hydrogenation of rosin over nano-Ni was mostly consisted of diterpane alcohol and superfatty acid methly ester.The content of dihydroabietic-type resin acids increased rapidly during the process of hydrogenation,but the content of abietic-type resin acids decreased quickly.A great deal of tetrahydroresin adcids was generated druring the catalytic hydrogenation with nano-Ni.
