Trifluoroiodomethane preparation method

Abstract

The invention provides a method for preparing trifluoroiodomethane through utilizing industrial waste trifluoroacetic acid and industrially recovered iodine. The method has the characteristics of low cost, simple operation, mild reaction, fast reaction speed, high yield, high selectivity, environmental protection and the like. The synthesized trifluoroiodomethane is an important fluorine-containing fine chemical engineering raw material, and can be used for producing fluorine-containing finishing agents, fluorine-containing surfactants and other fluorine-containing fine chemicals.

Description

technical field [0001] The invention relates to a method for preparing trifluoroiodomethane. [0002] Background technique [0003] Developing efficient, mild, and highly selective synthetic methods from cheap reagents as raw materials is one of the important challenges in organic synthetic chemistry. [0004] Perfluoroiodoalkane, commonly known as perfluoroalkyl iodide, is an important fluorine-containing fine chemical raw material and a key intermediate in the production of fluorine-containing finishing agents, fluorine-containing surfactants and other fluorine-containing fine chemicals. In addition, due to the particularity of its molecular structure, it can provide straight-chain perfluoroalkanes, and its corresponding products also have excellent high surface activity, high chemical stability, and hydrophobic and oil-repellent properties, so the downstream of perfluoroalkyl iodides Products, in light water fire extinguishing agent, magnetic recording material, hydroph...

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Problems solved by technology

[0018] In addition, there are also reports on the method of preparing trifluoroiodomethane using trifluoromethylation reagents as raw materials, such as: using CF 3 TMS, CF 3 Br is used as a raw material to prepare trifluoroiodomethane. This preparation method is generally used in laboratory research, because the raw materials of trifluoromethylation reagents are often difficult to obtain and expensive.

In addition, tetrafluoroethylene and iodine pentafluoride are used as raw materials to prepare pentafluoroiodoethane, and the method report of trifluoroiodomethane by-product simultaneously, such as the preparation method mentioned in Chinese patent CN101676248A, this type of reaction is harmful to the reactor material The requirements are high, the operation process is complicated, and the production cycle is long

[0019] In summary, the existing method for preparing trifluoroiodomethane has expensive raw materials, high cost, large amount of reaction solvent, low product yield, poor selectivity, and the elemental iodine used in the reaction is difficult to recycle and use, or during the reaction process A series of problems such as a large amount of three wastes are produced, which makes it difficult to realize the industrial production of low-level perfluoroalkane iodine

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