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huoyingfei

铜虫 (小有名气)

[求助] 液氮.操作

请各位大虾帮帮我.

In a 50 ml three-necked flask with the
middle neck connected to a dry ice cold-finger condenser,  The flask was flushed with N, for
15 min before NH3,(g) was introduced via the one neck and NH3,(l) allowed to
condense on the cold finger. About 15 ml of liquid ammonia were condensed
(- 77°C). The solution was stirred for 30 min with a magnetic stirrer and the NH,
then allowed to evaporate (about 1 h) by removing the dry ice from the condenser.
谁做过这方面的试验,帮我看看怎么做,我新手,不知道该怎么做.关键是a dry ice cold-finger condenser,是什么,还有 NH3,(l) allowed to
condense on the cold finger. About 15 ml of liquid ammonia were condensed
(- 77°C). 多谢了

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人类一思考,上帝就发笑! 让上帝笑去吧
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venpard

金虫 (小有名气)


huoyingfei(金币+1,VIP+0):多谢venpard 的指点,偶收益匪浅.
    其实可以用其他的东西代替干冰,如果实验室有低温浴槽(一般是用乙醇做浴液,可以达到零下60几度),一般的浴槽都有循环功能,只要在普通的冷凝器进口接低温浴槽的循环出口,冷凝器的出口接浴槽的进口,在低温浴槽调好需要的温度,打开循环就可以起到和干冰冷却一样的效果.
6楼2007-10-06 19:40:26
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huoyingfei

铜虫 (小有名气)

不好意思,是液氨,不是液氮.

不好意思.是液氨的操作,
人类一思考,上帝就发笑! 让上帝笑去吧
2楼2007-10-06 12:27:59
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yuxinghai455

银虫 (正式写手)

In a 50 ml three-necked flask with the
middle neck connected to a dry ice cold-finger condenser  在50ml三颈瓶中间颈口连接干冰冷凝器。
NH3,(l) allowed to condense on the cold finger.液氨可通过干冰冷凝器冷凝。
About 15 ml of liquid ammonia were condensed(- 77°C).
反应需要15ml左右的被冷却的液氨。
3楼2007-10-06 13:16:05
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mooncakexzj

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In a 50 ml three-necked flask with the middle neck connected to a dry ice cold-finger condenser  在50ml三颈瓶中间颈口连接干冰冷凝器。The flask was flushed with N, for 15 min before NH3,(g) was introduced via the one neck,在氨气通入以前,三口瓶应该通入氮气15分钟(应该是赶走空气)and NH3,(l) allowed to condense on the cold finger.液氨可通过干冰冷凝器冷凝。About 15 ml of liquid ammonia were condensed(- 77°C). 反应需要15ml左右的被冷却的液氨。
海上生明月,天涯共此时!
4楼2007-10-06 14:09:47
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