Catalytic Synthesis of Diisopentyl Oxalate with SO_4~(2-)/MnO_2/γ-Al_2O_3 New Solid Acid

New solid acid catalyst of SO2-4/MnO2/γ-Al2O3 was prepared from by direct impregnation-calcination processes.Diisopentyl oxalate was synthesized from oxalic acid and isoamy alcohol.The effects of calcination temperature of catalyst,the amount of catalyst,mole ratio of reactants,the amount of toluene,reaction time were discussed.The optimal conditions were:catalyst calcination temperature 500℃,the mass of catalyst 1.5 g,n(oxalic cid)∶n(isoamy alcohol)=1∶3,toluene 30mL,reaction time 1.5 h.Under optimum conditions,the yield of diisopentyl oxalate is 99.6%,respectively.New solid acid catalyst SO2-4/MnO2/γ-Al2O3 have high catalytic activity,high yields of product,convenient final treatment and non-pollution ofthree wastes,accord with development tendency of energy saving and environment protection as well as green catalysis.