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A technology of heptafluoropropane and hexafluoropropene, applied in the field of preparing 1,1,1,2,3,3,3-heptafluoropropane, which can solve the problems of short service life of the catalyst
Inactive Publication Date: 2013-08-14
SINOCHEM LANTIAN +1
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Problems solved by technology
The conversion and yield using the above two synthetic processes are high, reaching 95% and 99%, respectively, but the service life of these two catalysts is short
Method used
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Embodiment 1
[0017] Dissolve chromium chloride in deionized water to prepare a 20% mass concentration of chromium chloride solution; add 10% ammonia water dropwise under stirring, keep the reaction temperature at 10°C, and when the pH value of the reaction solution reaches 9.0 , stop the reaction, and stir for another 0.5h to obtain hydrated chromium oxide precipitate, filter, fully wash with deionized water, dry at 105 ° C, pulverize, dry the purchased magnesium oxide, and mix with hydrated chromium oxide evenly, the mass ratio The ratio of 7:3, adding an appropriate amount of water, kneading evenly, discharging and shaping, drying the shaped catalyst at 105 ℃, putting the shaped catalyst into the reaction tube, burning at 350 ℃ for 24 hours in the presence of nitrogen, Activated with HF for 24 hours, after the activation was completed, the temperature was lowered to 270 °C, the feeding amount of hexafluoropropylene was controlled at 180 g / h, the molar ratio of hexafluoropropylene and HF w...
Embodiment 2
[0019] The catalyst was prepared in the same manner as in Example 1, the molar ratio of hexafluoropropylene and HF was controlled at 1.2, and other reaction conditions were the same, the conversion rate of hexafluoropropylene was 54%, and the selectivity of HFC-227ea was 99%.
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Abstract
The invention discloses a 1,1,1,2,3,3,3-heptafluoropropane preparation method, and a preparation method of a special fluorination catalyst used therefor. The 1,1,1,2,3,3,3-heptafluoropropane preparation method treats hexafluoropropene and hydrogen fluoride as raw materials, the fluorination catalyst is a chrome oxide based catalyst, the molar ratio of hydrogen fluoride to hexafluoropropene is 1.0-3.5:1, and the reaction temperature is 200-350DEG C. The 1,1,1,2,3,3,3-heptafluoropropane preparation method has the advantages of high conversion rate of the hexafluoropropene raw material, good 1,1,1,2,3,3,3-heptafluoropropane selectivity, simple technology and easy industrialized production.
Description
technical field [0001] The present invention relates to a method for preparing 1,1,1,2,3,3,3-heptafluoropropane, in particular to a method for preparing 1,1,1,2,3,3, 3-heptafluoropropane method. Background technique [0002] Hydrofluorocarbons are widely used as replacements for chlorofluorocarbon compounds, mainly in various applications such as flame retardants and refrigerants. Heptafluoropropane, namely 1,1,1,2,3,3,3-heptafluoropropane, HFC-227ea, chemical formula is CF 3 CHFCF 3 , the product name is FM200, because of its zero ozone potential, low toxicity, high fire extinguishing efficiency, and no pollution to the use environment, it is one of the ideal substitutes for halon 1301, a halon fire extinguishing agent. [0003] The industrial synthesis method of HFC-227ea is mainly the addition reaction of hexafluoropropylene and hydrogen fluoride in the presence of a fluorination catalyst. According to the production process, there are two kinds of liquid phase fluorin...
Claims
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