[Overview]
The full name of tetrafluoropropanol is 2,2,3,3-tetrafluoro-1-propanol or 1,1,3-trihydrotetrafluoropropanol, the English abbreviation of TFP, which is telomer alcohol H (CF2CF2 )n=1 product in the nCH2OH series. Tetrafluoropropanol is an important branch of fluorine-containing fine chemicals and is a high value-added product. Because of its advantages such as good solubility, fast vaporization speed, and low toxicity, it is widely used as a pigment solvent for CD-ROMs. It is widely used in the synthesis and production of pesticides, medicines, dyes and various chemical additives and cleaning agents.
[Physical and chemical properties]
The molecular weight of pure tetrafluoropropanol is l32.06, and the physical and chemical properties are detailed in Table 1. Density; 1.471 Boiling point: 109°C Refractive index: 1.32-1.322 Flash point; 43°C Solubility: slightly soluble in benzene and toluene , chloroform, carbon tetrachloride, soluble in methanol, ether and acetic acid.
Table 1 shows the physical and chemical properties of tetrafluoropropanol
[Preparation method]
TetrafluoropropanolThere are four main production process routes. 1. Formylation of tetrafluoroethylene
Figure 1 is the reaction formula of formylation of tetrafluoroethylene
2. Telopolymerization of tetrafluoroethylene and methanol. Pour tetrafluoroethylene into methanol to generate a tetrafluoroethylene telomer alcohol mixture with the general formula H(CF2CF2)6CH20H. After fractionation, tetrafluoropropanol of different purity can be obtained. .
Figure 2 is the telomerization reaction formula of tetrafluoroethylene and methanol
3. Tetrafluoroethylene reacts with iodide to generate perfluoroalkyl iodide. The intermediate product generated by the reaction of perfluoroalkyl iodide with ethylene is then deiodinated with fuming sulfuric acid under appropriate reaction conditions to obtain high-yield telomerization. alcohol.
Figure 3 shows the reaction formula between tetrafluoroethylene and iodide
【Purpose】
Tetrafluoropropanol is mainly used as a solvent and can also be used as a raw material to produce other compounds or materials.
1. The solvent tetrafluoropropanol has a suitable boiling point, good solubility and spreadability for CD-ROM pigments, fast vaporization speed, and high safety, so it is currently widely used as a pigment solvent for C-DROM; In addition, when mixed with other compounds, it can also be used as a solvent for nylon 6, nylon 66 and nylon 610. It is used as a solvent and extraction agent in the synthesis of a variety of high-end dyes, new medicines and pesticides.
2. Cosolvent Use tetrafluoropropanol as a cosolvent, which can improve the composition and printing quality of inkjet, make the ink have good ink leakage resistance, clear dots and edges, and reduce the drying time after printing. .
3. In terms of cleaning, because it is non-toxic and has good surface activity and solubility, it has become a high-end new industrial and electronic cleaning agent. As a cleaning agent, it has excellent cleaning performance and has important uses in microelectronics and optoelectronics. Tetrafluoropropanol forms an azeotrope with water and can be used to clean mechanical equipment; mixed with tetrachlorodifluoroethane and nitrate, it can be used to remove wax on the surface of worn process workpieces (such as silicon wafers, magnetic heads and lenses, etc.). The effect is Very good; mixed with other compounds to quickly and completely strip alkyd-based coatings. It has no destructive effect on the atmosphere and is an excellent substitute for Freon cleaning agents.
4. The raw material tetrafluoropropanol can be used to produce sodium tetrafluoropropionate. The herbicide sodium tetrafluoropropionate originally used the tetrafluoroethylene cyanide synthesis route. Due to the toxicity of cyanide and environmental issues, it has been banned abroad. Industrial production; In addition, tetrafluoropropanol can be used to prepare various halogenated aromatic alkyl ethers, polyfluoroalkoxy propionic acid, alcohols or ethers, fluorine-containing olefins, glycols, anesthetic difluoromethyl-1,2, 2,3,3-pentafluoropropyl ether and vulcanized rubber with excellent properties.
5. Surfactant. Tetrafluoropropanol is an important raw material for fluorinated surfactants. Fluorinated surfactants have become the “elite” in the field of surfactants due to their ultra-high efficiency and extremely low dosage and concentration. With the steady and rapid development of my country’s industry, the demand for fluorinated surfactants has increased. The demand for fluorosurfactants is increasing rapidly, and a considerable amount of products needs to be imported every year to meet the domestic market demand. Tetrafluoropropanol can not only synthesize surfactants and fabric finishing agents through telomerization reaction, but also the mixture of tetrafluoropropanol and perfluoroheptanoic acid can be applied to the metal surface to give the metal surface drainage and oil discharge properties; in maleic acid Add sodium hydroxide solution, water, methanol and tetrafluoropropanol to the styrene copolymer, and the resulting solution can be used for anti-static treatment of films.
6. Other mixtures of tetrafluoropropanol and perfluoroheptanoic acid can be applied to the metal surface to give the metal surface drainage and oil discharge properties; adding sodium hydroxide solution to the solution of maleic acid-styrene copolymer , water, methanol and tetrafluoropropanol, the resulting solution can be used for anti-static treatment of films; in addition, tetrafluoropropanol, as a solvent-resistant release agent, can be used in the isolation layer of the adhesive tape to enhance the solvent resistance of the isolation layer of the adhesive tape. performance.
[Main reference materials]
[1]Chen Wenhua. Tetrafluoropropanol[J]. Fine and Specialty Chemicals, 2002(08):22-21.
[2] Lu Yongmei. Synthesis and application of tetrafluoropropanol and sodium tetrafluoropropionate[J]. Hangzhou Chemical Industry, 2004(04):28-29+34.
