In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with...In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.展开更多
无需有机溶剂、酸性配体及相转移剂,以30%H2O2为氧源,单独使用三氧化钨作催化剂催化氧化环己烯合成己二酸即可达到较高的产率和纯度。当三氧化钨用量为5.0m m ol,W O3:环己烯:H2O2的摩尔比为1:40:176时,在回流温度下反应6h,己二酸分离...无需有机溶剂、酸性配体及相转移剂,以30%H2O2为氧源,单独使用三氧化钨作催化剂催化氧化环己烯合成己二酸即可达到较高的产率和纯度。当三氧化钨用量为5.0m m ol,W O3:环己烯:H2O2的摩尔比为1:40:176时,在回流温度下反应6h,己二酸分离产率为75.4%,己二酸纯度99.8%。三氧化钨催化剂重复使用4次,己二酸的分离产率仍可达到70%以上。结合FTIR和XRD分析证明了三氧化钨催化氧化环己烯反应过程中催化剂的结构稳定性和重复使用性。展开更多
文摘In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.
文摘无需有机溶剂、酸性配体及相转移剂,以30%H2O2为氧源,单独使用三氧化钨作催化剂催化氧化环己烯合成己二酸即可达到较高的产率和纯度。当三氧化钨用量为5.0m m ol,W O3:环己烯:H2O2的摩尔比为1:40:176时,在回流温度下反应6h,己二酸分离产率为75.4%,己二酸纯度99.8%。三氧化钨催化剂重复使用4次,己二酸的分离产率仍可达到70%以上。结合FTIR和XRD分析证明了三氧化钨催化氧化环己烯反应过程中催化剂的结构稳定性和重复使用性。
