The production of propylene carbonate （PC） from urea and 1,2-propanediol （PG） was investigated in a batch process. The catalytic performances of zinc chloride and magnesium chloride were investigated for this reac...The production of propylene carbonate （PC） from urea and 1,2-propanediol （PG） was investigated in a batch process. The catalytic performances of zinc chloride and magnesium chloride were investigated for this reaction system. The influences of various operation conditions on the PC yield were explored. In this work, MgCl2 and ZnCl2 showed the excellent catalytic activity toward PC synthesis, and the yields of propylene carbonate reached 96.5% and 92.4%, respectively. The optimum reaction conditions were as follows： ethanol/urea molar ratio of 4, catalyst concentration of 1.5%, reaction temperature of 160 ℃, reaction time of 3 h, respectively. The route from urea and 1,2-propanediol shows advantages, such as mild reaction condition and safe operation. The catalytic system is environmentally benign.展开更多
A simple, mild, efficient Mn(salen)-catalyzed oxidation system of secondaty alcohols,in which the ionic liquid [bmim]PF_6 acts as a powerful additive, has been described. The reactionproceeded with higher efficiency. ...A simple, mild, efficient Mn(salen)-catalyzed oxidation system of secondaty alcohols,in which the ionic liquid [bmim]PF_6 acts as a powerful additive, has been described. The reactionproceeded with higher efficiency. The catalyst was more easier to recycle in ionic liquid[bmim]PF_6 with a well-proportioned CH_2C1_2 than in the single CH_2Cl_2 or ionic liquid.展开更多
基金supported by the National Natural Science Fund for Distinguished Young Scholars of China(No.20625308).
文摘The production of propylene carbonate （PC） from urea and 1,2-propanediol （PG） was investigated in a batch process. The catalytic performances of zinc chloride and magnesium chloride were investigated for this reaction system. The influences of various operation conditions on the PC yield were explored. In this work, MgCl2 and ZnCl2 showed the excellent catalytic activity toward PC synthesis, and the yields of propylene carbonate reached 96.5% and 92.4%, respectively. The optimum reaction conditions were as follows： ethanol/urea molar ratio of 4, catalyst concentration of 1.5%, reaction temperature of 160 ℃, reaction time of 3 h, respectively. The route from urea and 1,2-propanediol shows advantages, such as mild reaction condition and safe operation. The catalytic system is environmentally benign.
文摘A simple, mild, efficient Mn(salen)-catalyzed oxidation system of secondaty alcohols,in which the ionic liquid [bmim]PF_6 acts as a powerful additive, has been described. The reactionproceeded with higher efficiency. The catalyst was more easier to recycle in ionic liquid[bmim]PF_6 with a well-proportioned CH_2C1_2 than in the single CH_2Cl_2 or ionic liquid.
