作者encoreg10917 (Salen)
看板Chemistry
標題[實驗] 2-Naphthol 的純化方法
時間Fri Jan 10 14:53:28 2014
市售的2-Naphthol 為98% 顏色為但橘/褐白色
因為要用在催化反應，所以必須再進行純化
已知是先在結晶後，昇華。
但是小弟再結晶後還是一樣褐褐的，不敢昇華。
請問有版大知道要用甚麼再結晶比較適合嗎？我是看書用EtOH
以下附上純化書寫的內容，希望有經驗的版大可以給點方向 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)
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1F：推 jessti:他有用活性碳脫色 01/10 18:35
2F：推 jessti:一兩百克的話，溶於沸騰的EtOH到飽和，再慢慢加水到剛好些 01/10 18:37
3F：→ jessti:微混濁 01/10 18:37
4F：→ jessti:緩慢回溫應該可以結的不錯 01/10 18:38
5F：→ encoreg10917:謝謝樓上 我試試看!! 01/11 16:49