在一定条件下,萘可以被硝酸和硫酸的混合酸硝化生成二硝基物,它

在一定条件下,萘可以被硝酸和硫酸的混合酸硝化生成二硝基物,它是1,5­二硝基萘1,8­二硝基萘的混合物,后者可溶于质量分数大于98%的硫酸,而前者不能。利用这一性质可将这两种同分异构体分离。将上述硝化产物加入适量98%的硫酸,充分搅拌,用耐酸漏斗过滤,欲从滤液中得到固体1,8­二硝基萘,应采用的方法是(  )

A.蒸发浓缩结晶                   B.向滤液中加水过滤

C.用碳酸钠溶液处理滤液            D.将滤液缓缓加入水中

答案

D

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