The synthesis of allantoin from carbamide and ethyl aldehydic acid with rareearth solid superacid SO2-4/TiO2La3+as catalyst was studied.It was found that the optimal experimental conditions were th...The synthesis of allantoin from carbamide and ethyl aldehydic acid with rareearth solid superacid SO2-4/TiO2La3+as catalyst was studied.It was found that the optimal experimental conditions were that La3+/TiO2 was immersed for 12h and backed at 550℃ for 3h;the yield of the allantoin could reach up to 745% under molar ratio of carbamide and ethyl aldehydic acid 35∶1,amount of SO2-4/TiO2La3+ solid superacid catalyst of 10g(if the weight of ethyl aldehydic acid was 01mol),the reaction temperature of 73℃～75℃ and reactiom time of 3h.展开更多
The composite solid superacid SO2-4/TiO2-Fe2O3(nTi∶nFe=2∶1)was prepared by the method of deveiopmental sol-gel and wet impregnation.First reported the composite solid superacid catalysis sy...The composite solid superacid SO2-4/TiO2-Fe2O3(nTi∶nFe=2∶1)was prepared by the method of deveiopmental sol-gel and wet impregnation.First reported the composite solid superacid catalysis synthesized isobutyl butyrate for buthlacid and isobutyl alcohol.It was researched that the acid-alcohol rate,time,quantity and repeatly applicatiom of catalyzes had imflune upon yield of esterication reaction.The influent actors of reaction were investigated.The results showed that teh appropriate conditions should be:weight of cstalyst was 10g;molar ratio of isobutyl alcohol to buthlacid was 18∶1;reaction time was 30h;the taking water reagent (Benzene) was 15ml.The yield of isobutyl butyrate was about 985%.The acid value was:1602<Ho<1452.展开更多
文摘The synthesis of allantoin from carbamide and ethyl aldehydic acid with rareearth solid superacid SO2-4/TiO2La3+as catalyst was studied.It was found that the optimal experimental conditions were that La3+/TiO2 was immersed for 12h and backed at 550℃ for 3h;the yield of the allantoin could reach up to 745% under molar ratio of carbamide and ethyl aldehydic acid 35∶1,amount of SO2-4/TiO2La3+ solid superacid catalyst of 10g(if the weight of ethyl aldehydic acid was 01mol),the reaction temperature of 73℃～75℃ and reactiom time of 3h.
文摘The composite solid superacid SO2-4/TiO2-Fe2O3(nTi∶nFe=2∶1)was prepared by the method of deveiopmental sol-gel and wet impregnation.First reported the composite solid superacid catalysis synthesized isobutyl butyrate for buthlacid and isobutyl alcohol.It was researched that the acid-alcohol rate,time,quantity and repeatly applicatiom of catalyzes had imflune upon yield of esterication reaction.The influent actors of reaction were investigated.The results showed that teh appropriate conditions should be:weight of cstalyst was 10g;molar ratio of isobutyl alcohol to buthlacid was 18∶1;reaction time was 30h;the taking water reagent (Benzene) was 15ml.The yield of isobutyl butyrate was about 985%.The acid value was:1602<Ho<1452.
