i am trying to separate phenyl ethanol from,
1) Ethylammonium nitrate
2) [Emim]OAc
3) [Emim]HSO4
i tried with ethanol,MeOH, ether and CHCl3. none working !
Dear Mohit J Mehta,
Your problem is that the ionic liquids are miscible with most of the solvents you have used, in addition to their solubility in water. Therefore, you should select a hydrocarbon solvent such as n-pentane or n-hexane or aliphatic alcohol with a chain of C6-C8 such as 1-octanol. 2-phenylethanol is slightly soluble in these solvents, whereas the ionic liquid is not. Several extractions with one of the mentioned three solvents may do the job.
Hoping this will be helpful,
Rafik
Dear
Mohit J Mehta
I strongly recommend the answer of Rafik Karaman. You may also try to extract your product using any grades of pet.ether ,(40/60C) or (60/80 C) or 80/100 C)
@rafik Karaman and @Talaat i. El-Emary.
I tried it in hexane, heptane, and pet.Ether . it's not soluble in it.
Dear
Mohit J Mehta
The following paper may be useful for you:
Ionic liquids in separation techniques
A. Berthoda, , , M.J. Ruiz-Ángelb, S. Carda-Brochc
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doi:10.1016/j.chroma.2007.11.109
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Journal of Chromatography A, Volume 1184, Issues 1–2, 14 March 2008, Page 5
Referred to by
John G. Dorsey
Editorial on “Ionic liquids in separation techniques” by A. Berthod, M.J. Ruiz-Angel and S. Carda-Broch
@Talaat I. El-Emary
Thanks for papers. However my problem remains as 'phenyl ethanol' is a part of essential oil I am trying to extract , so only option work here is some of solvent or mixed solvent system which can back-extract oils from ILs
Dear Dear
Mohit J Mehta
I see that the solution of your problem is to do HPLC with siutable solvent such as CH2Cl2 to separate all componnents of your oil.
Good luck
Have you tried a biphasic system, such as chloroform/water? All of your ILs are strongly hydrophilic, so they will stay in the water phase, while the aromatic alcohol should go into the organic one.
@Boyan iliev
thanks for the valuable suggestion I tried di.ethyl ether + water system as with CHCl3/water system is not working, will report back once I get a result from GC
I am agree with Rafik. Try ethyl acetate/water system. You can reduce the amount of your solvent and increase the extraction times. For example 5*20 mL is better than 2*50 mL. Of course you may know this.
You should try for bi phasic system. You may try dichloromethane+benzene also.
yes i tried ethyl acetate and ethyl acetate+water biphasic system still its not working affinity of phenyl ethanol is very strong with IL , its getting soluble in ILs at RT. and recovery is not possible
You should be able to distill off the alcohol under reduced pressure. But I must admit, I am surprised that water +Chloroform did not work, I would have suggested toluene+water.
I agree with Prof Boyan Iliev, you may try using Toluene-H2O and/ or CHCl3-H2O or try to distll off phenyl ethanol under reduced pressure.
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