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Author: Subject: Drying dichloromethane with magnesium sulphate?
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[*] posted on 9-1-2018 at 16:30
Drying dichloromethane with magnesium sulphate?


Can I dry dichloromethane with magnesium sulphate ? I've seen calcium hydride is used and molecular sieves but can't find anything on magnesium sulphate
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[*] posted on 9-1-2018 at 16:31


I don't see why not, but calcium chloride works for DCM and is a stronger desiccant.

[Edited on 10-1-2018 by JJay]




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[*] posted on 9-1-2018 at 17:33


Ok cool I just didn't know if it would create some kind of reaction or dissolve in the dichloromethane. I usually used magnesium sulphate to dry it but and never had any problems but after seeing that it wasn't used I didn't know if it was wise to use it or not.
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[*] posted on 10-1-2018 at 00:32


With most desiccants it's a good idea to distil the solvent after drying it, but distilling DCM will dry it very well anyway, so what's the point of the drying agent?
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[*] posted on 10-1-2018 at 03:00


I've used it and it works fine.
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[*] posted on 10-1-2018 at 07:24


Quote: Originally posted by Radium212  
I've used it and it works fine.


I did not know just distilling DCM would sufficiently dry it. I would think a drying agent still should be used.
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[*] posted on 10-1-2018 at 07:29


It depends on how dry you need it. For many purposes, just distilling will be enough. When I was doing research, we needed to reflux it over phosphorus pentoxide before distilling.

But it's unlikely to react with most drying agents- it won't react with ordinary salts. You don't want to dry it with very strong bases, and definitely not alkali metals.

[Edited on 10-1-2018 by DraconicAcid]




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