四丁基溴化铵吸潮对它的活性有没有影响呢? tetra-n-butylammonium bromide [1643-19-2] m 322.4, m 119.6°. crystd from *benzene (5ml/g) at 80° by adding hot n-hexane (three volumes) and allowing to cool. dried over ?2o5 or mg(clo4)2,under vacuum. the salt is very hygroscopic. it can also be crystd from ethyl acetate or dry acetone by adding diethyl ether and dried in vacuo at 60° for 2 days. it has been crystd from acetone by addition of diethyl ether. so hygroscopic that all manipulations should be carried out in a dry-box. purified by precipitation of a saturated solution in dry ccu by addition of cyclohexane or by recrystallisation from ethyl acetate, then heating in vacuum to 75° in the presence of p2o5. [symons et al. j chem soc, faraday trans 1 76 2251 1908.] also recrystallised from ch2cl2/diethyl ether and dried in a vacuum desiccator over p2o5. [blau and espenson j am chem soc 108 1962 1986.] 从上面的表述来看，可用60度或者75度真空干燥，使用五氧化二磷做干燥剂。 一般用来做ptc，其表面积有要求，所以应该是干燥的。 查看更多
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