Sciencemadness Discussion Board

General Chemistry

Rajinder Singh Gujral - 4-1-2005 at 02:42

How to remove water from Isopropyl alcohol(IPA) WATER MIXTURE (10%MOISTURE AT START)

add salt?

Vitus_Verdegast - 4-1-2005 at 02:55

Why not add salt?

IPA is not miscible with conc aqueous NaCl solutions and will form a separate layer.

chochu3 - 4-1-2005 at 04:04

Add sodium carbonate or magnesium sulfate with salt can do the trick.

guaguanco - 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.

neutrino - 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.