Electronics > Beginners
Cheapest way to make up to 99% pure isopropanol
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Beamin:


Normally buying isoprop. there is a rip off because its 50%, too low to be usp and won't disinfect things, and too watery to act as a good solvent. But 50% in a large botles fits their margins. Also the cheapest source even though 50% is water. Buy a bunch of bottles. Next you turn it into 99% by adding a large amount of salt until you see two cm thick layer on the bottom. Shake vigously. settle, an aquous layer will form, decant.
this is making the aqueous fraction super saturated. Once it's super saturated it will pull the water in all the way out of the prop. up to 99%. The fractions will separate like oil and water. You can add more salt to be sure but dont have to.  Add molecular seives or another drying agent like Ca salts, and you have a very easy way to get to complete dryness, with no heat or still. Although compleate dryness is not neccisarry for most things. All for 1/2 the price of buying 91%. You can make the 99% down into 70% for cuts and first aide, or 85% for a good universal solvent/ cleaner/ screen cleaner. Just keep the bottles capped tight as water/humidity will get to them or leave on molecular seives. You could do this with other alcohols too.
JackJones:
Gasoline de-icers are usually isopropanol. Some of them do have additives in them so you have to check that. The one I use is pure isopropanol with nothing added. 4€/L, can't really beat that.
Jeroen3:
1 L of 99.85% IPA is €6.15 at the cleaning specialist. And it's not even a product that can be sold freely. (something drugs related)

It must have better availability in countries that don't restrict the substance, right?
ogden:
Worst thing for cleaning electronics and screens is IPA contaminated with saltwater.
wasyoungonce:
Thanks Beamin

I find it expensive to get hi quality IPA locally. 


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