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guanyongc至尊木虫 (知名作家)
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[交流]
如何分离三氟乙酸与水
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| 各位大虾，请教，三氟乙酸与水的共混物（三氟乙酸含量较多，约占95%），如何进行分离，得到较为纯净的三氟乙酸？ |
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2楼2010-03-24 09:35:56
hy861222
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guanyongc(金币+3): 2010-03-29 14:17
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Trifluoroacetic acid [76-05-11 M 114.0, f -15S0, b 72.4O, d 1.494, n 1.2850, pKZ5 0.52. The purification of trifluoroacetic acid, reported in earlier editions of this work, by refluxing over KMnO4 for 24h and slowly distilling has resulted in very SERIOUS EXPLOSIONS on various occasions, but not always. This apparently depends on the source andor age of the acid. The method is NOT RECOMMENDED. Water can be removed by adding trifluoroacetic anhydride (0.05%, to diminish water content) and distd. [Conway and Novak J Phys Chem 81 1459 1977. It can be refluxed and distd from P2O5. It is further purified by fractional crystn by partial freezing and again distd. Highly TOXIC vapour. |
3楼2010-03-24 09:42:49