Papers by Keyword: Hexafluoropropylene (HFP)

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Authors: Zhong Xie, Qi Xin Zhuang, Xiao Yun Liu, Jun Qian, Zhe Wen Han
Abstract: The apparent reactivity ratios of hexafluoropropylene (HFP)/vinylidene fluoride (VDF) emulsion copolymerization were studied by nonlinear fitting according to the copolymer composing equation, which, according to the calculation, are 1.88 and 0.86 respectively. The constitution of mixed gaseous monomers was measured through the gas chromatography. The copolymer compositions before and after reaction were measured by 19F-NMR. The calculated contents of VDF and HFP have nice accordance with the results from 19F-NMR analysis, which demonstrates that the method reported here is fairly reliable, and shed a light on the industry-scale consideration for the emulsion copolymerization of HFP and VDF.
Authors: Jian Zhao Qin, Fang Fang Shan, Yao Qing Chen
Abstract: The synthesis of hexafluoropropylene oxide in fixed-bed reactor using HFP as raw materials and molecular oxygen as oxidant is studied in the present paper. The selectivity of HFPO on the Ag/γ-Al2O3 catalyst prepared by impregnation can get 41.8%. The influence of the Ag/γ-Al2O3 catalyst modified by impregnation-sedimentation method and first group metal salts on synthesis reaction was investigated, as well as process conditions.
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