Yin H.,Zhengjing University |
Wang G.,Zhengjing University |
Dai S.-Y.,Zhengjing University |
Yuan S.-F.,Zhengjing University |
Chen Z.-R.,Zhengjing University
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2015
Hexafluoropropylene oxide was synthesized by using hexafluoropropylene (raw material), sodium hypochlorite (oxidant), 1,1,2-trichlorotrifluoroethane (solvent) and trioctylmethylammonium chloride (phase-transfer catalyst), and the effects of sodium hypochlorite aqueous solution adding approach, reaction temperature, catalyst dosage, sodium hypochlorite solution/1,1,2-trichlorotrifluoroethane volume ratio and reaction time on the oxidation process was investigated. The results show that when sodium hypochlorite is slowly added under reaction temperature of -12℃, and the catalyst dosage is 2.5g with aqueous/organic phase volume ratio of 1 and reaction time of 2 h, the conversion of hexafluoropropylene is 91.3% and the yield and selectivity of hexafluoropropylene oxide can reach to 84.5% and 92.5%, respectively. The formation mechanism of the byproducts SNaF, CF3COONa, CF3CF2COONa and CF3CFHCOONa is proved by 19F-NMR and 1H-NMR, and the intermediates and transition states of the reaction were obtained by quantum chemical calculation on DFT/uB3LYP/6-31+G(d, p). ©, 2015, Zhejiang University. All right reserved.