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Author: Subject: General Chemistry
Rajinder Singh Gujral
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[*] posted on 4-1-2005 at 02:42
General Chemistry


How to remove water from Isopropyl alcohol(IPA) WATER MIXTURE (10%MOISTURE AT START)
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Vitus_Verdegast
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[*] posted on 4-1-2005 at 02:55
add salt?


Why not add salt?

IPA is not miscible with conc aqueous NaCl solutions and will form a separate layer.
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chochu3
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[*] posted on 4-1-2005 at 04:04


Add sodium carbonate or magnesium sulfate with salt can do the trick.
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guaguanco
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[*] posted on 4-1-2005 at 09:43


I don't have my CRC handy, but I'm sure there's a handy azeotrope that would work. For example, adding benzene followed by distillation of a isopropanol/water/benzene azeotrope leaves anhydrous isopropanol.
This is just an example; I don't know that benzene forms such an azeotrope.
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neutrino
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[*] posted on 4-1-2005 at 14:11


The azeotrope you speak of in known: bp 66.5*C, 7.5% water, 73.8% benzene, 18.7% isopropyl alcohol. This might be a problem, though, as benzene is hard to get nowadays. There is a toluene azeotrope, though: bp 76.3*C, 13.1% water, 38.2% alcohol.
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