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问题:氯苯脱水????
类型:求助 (悬赏分:3分)
提问:yrgdy
等级:
版块:有机化学问题(jimuwei,fpcwin1211,netpanda,yjgzfl,Ftian,)
信誉:86%
回复:6
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时间:2005-12-08 23:02:47  编辑    加入/取消收藏    订制/取消短消息    举报该贴    

氯苯含微量水,混浊,如何脱水?(CaCl2除外)
回复人:wangjinyon, (化工成就了我,我会成就化工) 时间:2005-12-09 01:09:59   编辑 1楼
分子筛不知可否
不过很多有机物除水要求高的都是用加氧化钙蒸馏


回复人:zhanghx88, () 时间:2005-12-09 07:28:00   编辑 2楼
drying with CaCl2, K2CO3 or CaSO4, then with
P2O5, and distn. It can also be dried with Linde 4A molecular sieve. Passage through, and storage over,
activated alumina has been used to obtain low conductance material. [Flaherty and Stern / J Am Chem Soc 80
1034 7955.]


回复人:fisher, (organic chemist) 时间:2005-12-09 07:30:55   编辑 3楼
A common purification procedure is to wash several times with cone H2SO4 then with aq NaHCO3 or Na2CO3, and water, followed by drying with CaCl2, K2CO3 or CaSO4, then with P2O5, and distn. It can also be dried with Linde 4A molecular sieve. Passage through, and storage over,activated alumina has been used to obtain low conductance material.


回复人:sln1980197, () 时间:2005-12-09 11:05:33   编辑 4楼
用4A的分子筛可去除大部分水分.分子筛要在600度下活化4小时.


回复人:llctsp, () 时间:2005-12-09 15:53:22   编辑 5楼
如果要求不高的话可用共沸蒸馏


回复人:yrgdy, () 时间:2005-12-09 18:43:46   编辑 6楼
已经打分了。


得分人:wangjinyon-1,zhanghx88-1,fisher-1,sln1980197-1,llctsp-1,


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