I am in need of liquid ammonia to be used as a solvent in some of my reactions. I cannot buy it. But, if there is any easy, cheap and safe way to synthesize it, I would try to make it in my lab on my own.
Please suggest some ways with reference.
You have to purge gaseous ammonia in a RBF at very low temperature( maintained with mixture of IPA and dry ice) bath outside RBF so gaseous ammonia converted into liquid ammonia below -42 °C. But this process is very much tedious and perform only in fumehood. We have converted gaseous ammonia into liquid ammonia this way in lab to perform a reaction.You can check in organic vogel procedure may be there.
Can you tell what reaction you should perform using liquid ammonia. May be some alternative of ammonia possible.
KOH + NH3(25% aq) -> NH3(gas), condensation in flask with cooling (LN2+EtOH), addition of small pieces of Na, dissolution to obtain bright-blue color (dryness indication), recondensation in reaction flask.
After evaporation of NH3 from first flask, sodium build thin film on surface - danger of explosion after H2O contact (personal experience :-) - destroy this film with alcohol (i-PrOH or tert-BuOH) after Ar filling.
Addition of some ammonium salts allow to work with ammonia at RT at slight overpressure in ordinary glassware.
Reaction of ether splitting run 4hrs. Same time is needed in selected organic solvents at room temperatures - without extremal conditions and smells, so NH3 is bad idea, Sachin
Video for newcomers in chemistry, hopeless lamers and particularly for Sachin:
https://www.youtube.com/watch?v=gHokrNS1ask
https://www.youtube.com/results?search_query=sodium+in+liquid+ammonia
In case you have an ammonia gas cylinder in your laboratory, you may generate liquid ammonia by using a condenser, meant for this purpose. For cooling, ethanol-dry ice or liquid nitrogen-ethanol system may be used, as suggested by Sharma and Rogoza. To get an idea about the condenser, please follow the suggestion from Sharma and consult A.I. Vogel's book on Practical Organic Chemistry.
Some time in 1977-78, as a student I used to carry out reactions using liquid ammonia. It is relatively safe, if you carry out your experiments in a fume-cupboard.
Dear All,
Many many thanks for your valuable responses.
I wish to make Liquid Ammonia in my laboratory. Can anyone please provide me a detailed procedure to do so? Is there any reference for the same.
Thanks
Regards
Sachin
What is wrong with the answer given by Andrei Rogoza? One of the youtube video is quite simple and detailed for the preparation of NH3 gas. If you cool it by means of dry ice of liq. N2, you can get liquid ammonia.
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