Preparation of biodiesel from soybean oils catalyzed by five acidic ionic liquids with three cationic functional groups was investigated. The improvement of the catalytic activities was affected by various functional ...Preparation of biodiesel from soybean oils catalyzed by five acidic ionic liquids with three cationic functional groups was investigated. The improvement of the catalytic activities was affected by various functional groups including pyridine group, N- methylimidazole group, triethylamine group. Among them [C4SO3Hpy]HSO4 with pyridine group showed better catalytic activity with the biodiesel yield of 94.5%, and still yielded more than 90% after six successive uses. The possible mechanism was also discussed by two reaction paths in detail.展开更多
The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results...The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results,it could be seen that the vegetable oil hydrolysis in near-critical water was a typical self-catalyzed reaction.With a second-order kinetics equation,the activation energies evaluated were 41.8 kJ·mol-1 for olive oil,37.3 kJ·mol-1 for peanut oil,37.7 kJ·mol-1 for soybean oil,31.2 kJ·mol-1 for safflower oil respectively.The activation energies of different vegetable oils had a close relationship with their iodine values.With increasing iodine value,the activation energy of vegetable oil hydrolysis in near-critical water decreased.展开更多
基金supports from the Specialized Research Fund for the Doctoral Program of Higher Education(New Teachers)(No20100093120003)the Fundamental Research Funds for the Central Universities(No JUSRP21112)
文摘Preparation of biodiesel from soybean oils catalyzed by five acidic ionic liquids with three cationic functional groups was investigated. The improvement of the catalytic activities was affected by various functional groups including pyridine group, N- methylimidazole group, triethylamine group. Among them [C4SO3Hpy]HSO4 with pyridine group showed better catalytic activity with the biodiesel yield of 94.5%, and still yielded more than 90% after six successive uses. The possible mechanism was also discussed by two reaction paths in detail.
文摘The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results,it could be seen that the vegetable oil hydrolysis in near-critical water was a typical self-catalyzed reaction.With a second-order kinetics equation,the activation energies evaluated were 41.8 kJ·mol-1 for olive oil,37.3 kJ·mol-1 for peanut oil,37.7 kJ·mol-1 for soybean oil,31.2 kJ·mol-1 for safflower oil respectively.The activation energies of different vegetable oils had a close relationship with their iodine values.With increasing iodine value,the activation energy of vegetable oil hydrolysis in near-critical water decreased.
