硝基苯如何提纯？ nitrobenzene [98-95-3］ m 123.1, f 5.8o, b 84-86°/6.5-8mm, 210.8°/760mm, d 1.206, n15° 1.55457, n 1.55257, pk18 -11.26 (aq h2s04 ) . common impurities include nitrotoluene,dinitrothiophene, dinitrobenzene and aniline. most impurities can be removed by steam distn in the presence of dilute h2so4, followed by drying with cac12, and shaking with, then distilling at low pressure from bao,p2o5, alc13 or activated alumina. it can also be purified by fractional crystn from absolute etoh (by refrigeration). another purification process includes extraction with aqueous 2m naoh, then water, dilute hcl,and water, followed by drying (cac12, mgs04 or cas04) and fractional distn under reduced pressure. the pure material is stored in a brown bottle, in contact with silica gel or cah2. it is very hygroscopic. 地一个方法是不是稀硫酸洗，在水蒸汽蒸溜，干燥后`在减压蒸馏啊 第二个是不是2mol/l碱洗，稀盐酸洗，在减压蒸馏啊？我按这个做了一下颜色的确又变浅了一些，可还是有啊，高手在指点一下吧 [此贴子已经被作者于2008-1-7 17:10:47编辑过] 查看更多
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