环戊烯选择氧化合成戊二酸绿色催化过程

研究了以环戊烯为原料、草酸为有机络合剂、H2O2为氧化剂,在催化剂钨酸(H2WO4)的作用下一步合成戊二酸的绿色新过程,考察了氧化剂的含量、反应物配比、催化剂用量、反应温度、反应时间等对反应的影响。确定了最佳反应条件:选用50%(质量分数)的H2O2为氧化剂、反应物配比n(H2O2)∶n(环戊烯)=4.4、n(H2WO4)∶n(草酸)=1、催化剂用量(H2WO4占环戊烯的摩尔分数)1.5%、反应温度85℃、反应时间6h。在最佳反应条件下,戊二酸的收率高达92.3%。该方法洁净、高效,产物戊二酸的纯度高,符合绿色化学的要求。实验结果表明,强酸性环境有利于戊二酸的生成,表明此反应为酸催化的选择氧化反应。

Green Catalytic Process for Synthesis of Glutaric Acid by Selective Oxidation of Cyclopentene

A novel one-step green process for synthesis of glutaric acid by selective oxidation of cyclopentene was investigated.Hydrogen peroxide(H_2O_2)was used as oxidant,oxalic acid as complexing agent and tungstic acid(H_2WO_4)as catalyst.Glutaric acid can be used as starting material for synthesizing plasticizers and disinfectants.Under optimal reaction conditions:50%(mass fraction) hydrogen peroxide as oxidant,n(H_2O_2) ∶n(cyclopentene)=4.4,n(H_2WO_4) ∶n(oxalic acid)=1,catalyst content 1.5%(mole fraction in cyclopentene),reaction temperature 85℃ and reaction time 6h,yield of glutaric acid could reach 92.3%.Since H_2O_2 was used as oxidant,the process,without any phase-transfer catalyst and organic solvent,was clean and non-toxic,and could meet requirement of environmental protection.It was found that strong acidity was favorable to the process therefore tungstic acid was a very suitable catalyst for the reaction.