作者encoreg10917 (Salen)
看板Chemistry
标题[实验] 2-Naphthol 的纯化方法
时间Fri Jan 10 14:53:28 2014
市售的2-Naphthol 为98% 颜色为但橘/褐白色
因为要用在催化反应，所以必须再进行纯化
已知是先在结晶後，昇华。
但是小弟再结晶後还是一样褐褐的，不敢昇华。
请问有版大知道要用甚麽再结晶比较适合吗？我是看书用EtOH
以下附上纯化书写的内容，希望有经验的版大可以给点方向 OTZ
Crystallize 2-naphthol from aqueous 25% EtOH(charoal), H2O,
benzene, toluene or CCl4.
Alternatively, extract it repeatedly with small amounts of EtOH,
followed by dissolution in a minimum volume of EtOH and
precipitation with distilled water, then drying over P2O5 under vacuum.
It has also been dissolved in aqueous NaOH and precipitated
by adding acid (repeat several times),
then precipitated from benzene by addition of heptane.
Final purification can be by zone melting or sublimation in vacuo.
The 4-nitrobenzoate has m=104o (from EtOH)
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.114.44.102
1F：推 jessti:他有用活性碳脱色 01/10 18:35
2F：推 jessti:一两百克的话，溶於沸腾的EtOH到饱和，再慢慢加水到刚好些 01/10 18:37
3F：→ jessti:微混浊 01/10 18:37
4F：→ jessti:缓慢回温应该可以结的不错 01/10 18:38
5F：→ encoreg10917:谢谢楼上 我试试看!! 01/11 16:49