Research progress on synthesis of chlorofluorocarbon substitutes or intermediates by gas-phase fluorine-chlorine exchange
The use of chlorofluorocarbons(CFCs)alternatives can avoid the use of ozone-depleting substances and reduce greenhouse gas emissions.The gas-phase fluorine-chlorine exchange reaction belongs to Swartz reaction under catalysis of fluorides,which is mainly used for the synthesis of C1～C6 CFCs substitutes or their intermediates as well as a series of heteroatomic fluorides used in important fields such as lithium batteries and fluorine-containing pharmaceuticals,showing the characteristics of green,efficiency,and easy to achieve large-scale production.The reaction mechanism,fluorination catalysts,and synthetic processes of CFCs substitutes or intermediates by gas-phase fluorine-chlorine exchange were reviewed.The future development trend of gas-phase fluorine-chlorine exchange was discussed,and it was proposed that the future study should focus on the theoretical basis of chromium-based catalysts for gas-phase fluorine-chlorine exchange reactions,development of gas-phase fluorine-chlorine exchange process technologies for high-carbon chloroalkanes,and the application of gas-phase fluorine-chlorine exchange technology in new energy and fluorine-containing pharmaceutical fields.
chlorofluorocarbon substitutesfluorine-chlorine exchangereaction mechanismfluorination catalystschromium-based catalystssynthesis process
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