Process for purifying 2-chloro-3,3,3-trifluoropropene from a first composition comprising 2-chloro-3,3,3-trifluoropropene and 1,1,1,3,3-pentafluoropropane, said process comprising the steps of: a) placing said first composition in contact with at least one organic extracting agent to form a second composition; b) extractive distillation of said second composition to form: i) a third composition comprising said organic extracting agent and 1,1,1,3,3-pentafluoropropane, ii) a stream comprising 2-chloro-3,3,3-trifluoropropene; c) recovering and separating out said third composition to form a stream comprising said organic extracting agent and a stream comprising 1,1,1, 3, 3-pentafluoropropane; characterized in that said organic extracting agent is chosen from the group consisting of ethanedial, propanone, methyl acetate, chloromethoxymethane, isobutanal, methanol, isopropyl formate, methylglyoxal, 2,2,2-trifluoroethanol, 1,1,1-trifluoro-2-propanol, ethyl acetate, ethanol, butanone, n-propyl formate, 2-propanol, acetonitrile, pentafluoro-1-propanol, tert-butanol, 1,2-dimethoxyethane, isopropyl acetate, 2-methylbutanal, 2-methoxyethanamine, tert-butyl acetate, propionitrile, 2-allyloxyethanol, ethyl propionate, dioxane, 3-pentanone, 2-pentanone, trimethoxymethane, 3,3-dimethyl-2-butanone, 1,3-dioxane, 2,2,3,3-tetrafluoro-1-propanol, sec-butyl acetate, N-methyl-1,2-ethanediamine, 1,3,5-trioxane, 4-methyl-2-pentanone, 1,2-diaminoethane, butyronitrile, 1-methoxy-2-propanol, 1,2-propanediamine, perfluorobutanoic acid, 1-(dimethylamino)-2-propanol, 2-methoxyethanol, 4,4,4-trifluorobutanol, diethyl carbonate, n-butyl acetate, 2-hexanone, 3-fluoropropanol, 5-hexen-2-one, 2-methoxy-1-propanol, 1-ethoxy-2-propanol, 2-(dimethylamino)ethanol, ethoxyethanol, 2-ethoxy-1-propanol, 1,3-propanediamine, 3,3,4,4,5,5,6,6-octafluoro-1-pentanol, valeronitrile, (methyleneamino)acetonitrile, 3-furfural, 4-methyl-2-hexanone, 1-methoxy-2-acetoxypropane, methyl hexanoate, 2-propoxyethanol, 1-propoxy-2-propanol, dimethylethanolamine, 2-heptanone, dimethylformamide, 2-isopropoxyethanol, cyclohexanone, 2-ethoxyethyl acetate, 3-hydroxybutanal, 2-(methylamino)ethanol, 4-methoxy-4-methylpentan-2-one, 3-ethoxy-1-propanol, 3-methoxy-1-butanol, furfural, diglyme, 3-methoxypropanenitrile, 2-(ethylamino)ethanol, 3-octanone, diacetone alcohol, 1-butoxy-2-propanol, 2-furanmethanol, methyl acetoacetate, 2-aminopropanol, N,N-dimethylpropanamide, 2-amino-1-butanol, 2-methyl-2-nitro-1-propanol, 2-propyl-1-methoxypropanoate, cycloheptanone, dimethyl malonate, 1,1,3,3-tetramethoxypropane, dimethyl sulfate, dimethyl sulfoxide, 2-butoxyethyl acetate, diethyl sulfoxide, 2-(2-methoxyethoxy)ethanol, 1,2-butanediol, diethylene glycol monoethyl ether, trimethyl phosphate, 2-methyl-2,4-pentanediol, methyl benzoate and diethyl malonate. a) placing said first composition in contact with at least one organic extracting agent to form a second composition; b) extractive distillation of said second composition to form: i) a third composition comprising said organic extracting agent and 1,1,1,3,3-pentafluoropropane, ii) a stream comprising 2-chloro-3,3,3-trifluoropropene; i) a third composition comprising said organic extracting agent and 1,1,1,3,3-pentafluoropropane, ii) a stream comprising 2-chloro-3,3,3-trifluoropropene; c) recovering and separating out said third composition to form a stream comprising said organic extracting agent and a stream comprising 1,1,1, 3, 3-pentafluoropropane; characterized in that said organic extracting agent is chosen from the group consisting of ethanedial, propanone, methyl acetate, chloromethoxymethane, isobutanal, methanol, isopropyl formate, methylglyoxal, 2,2,2-trifluoroethanol, 1,1,1-trifluoro-2-propanol, ethyl acetate, ethanol, butanone, n-propyl formate, 2-propanol, acetonitrile, pentafluoro-1-propanol, tert-butanol, 1,2-dimethoxyethane, isopropyl acetate, 2-methylbutanal, 2-methoxyethanamine, tert-butyl acetate, propionitrile, 2-allyloxyethanol, ethyl propionate, dioxane, 3-pentanone, 2-pentanone, trimethoxymethane, 3,3-dimethyl-2-butanone, 1,3-dioxane, 2,2,3,3-tetrafluoro-1-propanol, sec-butyl acetate, N-methyl-1,2-ethanediamine, 1,3,5-trioxane, 4-methyl-2-pentanone, 1,2-diaminoethane, butyronitrile, 1-methoxy-2-propanol, 1,2-propanediamine, perfluorobutanoic acid, 1-(dimethylamino)-2-propanol, 2-methoxyethanol, 4,4,4-trifluorobutanol, diethyl carbonate, n-butyl acetate, 2-hexanone, 3-fluoropropanol, 5-hexen-2-one, 2-methoxy-1-propanol, 1-ethoxy-2-propanol, 2-(dimethylamino)ethanol, ethoxyethanol, 2-ethoxy-1-propanol, 1,3-propanediamine, 3,3,4,4,5,5,6,6-octafluoro-1-pentanol, valeronitrile, (methyleneamino)acetonitrile, 3-furfural, 4-methyl-2-hexanone, 1-methoxy-2-acetoxypropane, methyl hexanoate, 2-propoxyethanol, 1-propoxy-2-propanol, dimethylethanolamine, 2-heptanone, dimethylformamide, 2-isopropoxyethanol, cyclohexanone, 2-ethoxyethyl acetate, 3-hydroxybutanal, 2-(methylamino)ethanol, 4-methoxy-4-methylpentan-2-one, 3-ethoxy-1-propanol, 3-methoxy-1-butanol, furfural, diglyme, 3-methoxypropanenitrile, 2-(ethylamino)ethanol, 3-octanone, diacetone alcohol, 1-butoxy-2-propanol, 2-furanmethanol, methyl acetoacetate, 2-aminopropanol, N,N-dimethylpropanamide, 2-amino-1-butanol, 2-methyl-2-nitro-1-propanol, 2-propyl-1-methoxypropanoate, cycloheptanone, dimethyl malonate, 1,1,3,3-tetramethoxypropane, dimethyl sulfate, dimethyl sulfoxide, 2-butoxyethyl acetate, diethyl sulfoxide, 2-(2-methoxyethoxy)ethanol, 1,2-butanediol, diethylene glycol monoethyl ether, trimethyl phosphate, 2-methyl-2,4-pentanediol, methyl benzoate and diethyl malonate.