The present disclosure provides a process for making trifluoroacetyl iodide (TFAI) in a liquid phase reaction. Specifically, the present disclosure provides a liquid phase reaction of trifluoroacetyl chloride (TFAC) and hydrogen iodide (HI), with or without a catalyst, to form trifluoroacetyl iodide (TFAI). The reaction may be performed at ambient or elevated temperatures.

A process for preparing a low-molecular weight fluoropolyether containing an acid fluoride by decomposing a triflate or trifluoroacetate of a fluoropolyether having a hydroxyl group in the presence of a Lewis acid.

A process for preparing a low-molecular weight fluoropolyether containing an acid fluoride by decomposing a triflate or trifluoroacetate of a fluoropolyether having a hydroxyl group in the presence of a Lewis acid.

Provided is a method for producing fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride ((CF.sub.3).sub.2CHCOF), which are useful as dry etching gases etc., safely and inexpensively with high purity. According to the method in which 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether is pyrolyzed in a gas phase in the presence of a catalyst, the desired fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be obtained with high selectivity and high conversion of the starting material by a simple process in which a pyrolysis reaction is performed in a gas phase using the inexpensive starting material.

Provided is a method for producing fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride ((CF.sub.3).sub.2CHCOF), which are useful as dry etching gases etc., safely and inexpensively with high purity. According to the method in which 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether is pyrolyzed in a gas phase in the presence of a catalyst, the desired fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be obtained with high selectivity and high conversion of the starting material by a simple process in which a pyrolysis reaction is performed in a gas phase using the inexpensive starting material.

Provided is a method for producing fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride ((CF.sub.3).sub.2CHCOF), which are useful as dry etching gases etc., safely and inexpensively with high purity. According to the method in which 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether is pyrolyzed in a gas phase in the presence of a catalyst, the desired fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be obtained with high selectivity and high conversion of the starting material by a simple process in which a pyrolysis reaction is performed in a gas phase using the inexpensive starting material.

A process for producing a perfluoropolyether acyl fluoride which includes reducing a peroxyperfluoropolyether by using a formyl group-containing compound in the presence of a transition metal catalyst.

A photochemical reactor and a photo-oxidation process for manufacturing organic compounds are disclosed. The photo-oxidation generates polyfluorochloro- and/or perfluorocarboxylic acid chloride compounds, in particular halogenated acetyl chlorides, such as polyfluorochloro- and/or perfluoro acetyl chloride. The photo-oxidation process is exothermic. The reactor has a channel or a channels system, including tubes, pipes, or coils, such as coiled tubes or pipes, and, optionally, gasket installations in combination with tubes/pipes, and interior installations, such as microtubes or micropipes. The interior installations avoid formation of hot spots and provide for very good mixing of the reaction medium, such that the photochemical reactions do not only take place in part of reaction medium within a few mm around the UV lighting source. Formation of oxidizing by-products is eliminated, which may otherwise be formed during the photochemical oxidation and possibly accumulate in the photochemical reactor and/or process equipment, such as cooling traps and piping systems.

A photochemical reactor and a photo-oxidation process for manufacturing organic compounds are disclosed. The photo-oxidation generates polyfluorochloro- and/or perfluorocarboxylic acid chloride compounds, in particular halogenated acetyl chlorides, such as polyfluorochloro- and/or perfluoro acetyl chloride. The photo-oxidation process is exothermic. The reactor has a channel or a channels system, including tubes, pipes, or coils, such as coiled tubes or pipes, and, optionally, gasket installations in combination with tubes/pipes, and interior installations, such as microtubes or micropipes. The interior installations avoid formation of hot spots and provide for very good mixing of the reaction medium, such that the photochemical reactions do not only take place in part of reaction medium within a few mm around the UV lighting source. Formation of oxidizing by-products is eliminated, which may otherwise be formed during the photochemical oxidation and possibly accumulate in the photochemical reactor and/or process equipment, such as cooling traps and piping systems.

Described herein are three methods for making halogenated fluorinated ether-containing compounds using a fluorinated olefin or hexafluoropropylene oxide.