Provided are: a method of removing 2-chloro-1,3,3,3-tetrafluoropropene (1224xe), the method including bringing a mixture containing 1224xe and 1224yd into contact with an alkali optionally in the presence of a phase transfer catalyst; and a method of producing 1-chloro-2,3,3,3-tetrafluoropropene (1224yd), the method including bringing a mixture containing 1224xe and 1224yd into contact with an alkali optionally in the presence of a phase transfer catalyst.

Provided are: a method of removing 2-chloro-1,3,3,3-tetrafluoropropene (1224xe), the method including bringing a mixture containing 1224xe and 1224yd into contact with an alkali optionally in the presence of a phase transfer catalyst; and a method of producing 1-chloro-2,3,3,3-tetrafluoropropene (1224yd), the method including bringing a mixture containing 1224xe and 1224yd into contact with an alkali optionally in the presence of a phase transfer catalyst.

This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C.sub.8F.sub.17Brand further contains C.sub.7F.sub.15COOH, wherein C.sub.7F.sub.15COOH is present in a concentration of 25 ppb or less based on the total weight of C.sub.8F.sub.17Br. The method for producing C.sub.8F.sub.17Br comprises reacting C.sub.8F.sub.17I and a brominating agent to obtain C.sub.8F.sub.17Br, and alkali-washing the obtained C.sub.8F.sub.17Br to reduce the C.sub.7F.sub.15COOH content to 25 ppb or less based on the total weight of C.sub.8F.sub.17Br.

This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C.sub.8F.sub.17Brand further contains C.sub.7F.sub.15COOH, wherein C.sub.7F.sub.15COOH is present in a concentration of 25 ppb or less based on the total weight of C.sub.8F.sub.17Br. The method for producing C.sub.8F.sub.17Br comprises reacting C.sub.8F.sub.17I and a brominating agent to obtain C.sub.8F.sub.17Br, and alkali-washing the obtained C.sub.8F.sub.17Br to reduce the C.sub.7F.sub.15COOH content to 25 ppb or less based on the total weight of C.sub.8F.sub.17Br.

The present disclosure provides a method for purifying trifluoroiodomethane. The method includes providing a process stream comprising trifluoroiodomethane, organic impurities, and acid impurities; reacting the process stream with a basic aqueous solution, the basic aqueous solution comprising water and at least one base selected from the group of an alkali metal carbonate and an alkali metal hydroxide; and separating at least some of the organic impurities from the process stream.

The present disclosure provides a method for purifying trifluoroiodomethane. The method includes providing a process stream comprising trifluoroiodomethane, organic impurities, and acid impurities; reacting the process stream with a basic aqueous solution, the basic aqueous solution comprising water and at least one base selected from the group of an alkali metal carbonate and an alkali metal hydroxide; and separating at least some of the organic impurities from the process stream.

The present invention relates to a method for producing high-purity 1,1,1,2,3,3-hexafluoropropane and a composition containing mainly 1,1,1,2,3,3-hexafluoropropane, suitable for use as a cleaning agent in the semiconductor industry.

The present invention relates to a method for producing high-purity 1,1,1,2,3,3-hexafluoropropane and a composition containing mainly 1,1,1,2,3,3-hexafluoropropane, suitable for use as a cleaning agent in the semiconductor industry.

This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C.sub.8F.sub.17Brand further contains C.sub.7F.sub.15COOH, wherein C.sub.7F.sub.15COOH is present in a concentration of 25 ppb or less based on the total weight of C.sub.8F.sub.17Br. The method for producing C.sub.8F.sub.17Br comprises reacting C.sub.8F.sub.17I and a brominating agent to obtain C.sub.8F.sub.17Br, and alkali-washing the obtained C.sub.8F.sub.17Br to reduce the C.sub.7F.sub.15COOH content to 25 ppb or less based on the total weight of C.sub.8F.sub.17Br.

This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C.sub.8F.sub.17Brand further contains C.sub.7F.sub.15COOH, wherein C.sub.7F.sub.15COOH is present in a concentration of 25 ppb or less based on the total weight of C.sub.8F.sub.17Br. The method for producing C.sub.8F.sub.17Br comprises reacting C.sub.8F.sub.17I and a brominating agent to obtain C.sub.8F.sub.17Br, and alkali-washing the obtained C.sub.8F.sub.17Br to reduce the C.sub.7F.sub.15COOH content to 25 ppb or less based on the total weight of C.sub.8F.sub.17Br.