Electronics > Beginners

Cheapest way to make up to 99% pure isopropanol

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TheAmmoniacal:
A cheap source of clean ethanol (96-97%) is bioethanol fuel for lamps.

ov_darkness:
 I pay about 7.5EUR for 5 liters of 99% IPA. For sth like 12EUR I can buy analytical grade one.

VE2UM:
IPA = India Pale Ale ????

Sorry, it's hot here today.... Couldn't resist !!!!

westfw:
The geographical dependencies are ... interesting.

--- Quote ---a common "sanitary alcohol" is 70% ethanol.
--- End quote ---
In the US, the standard seems to be 70% IPA.  I don't know why.


--- Quote ---stores that sell big bottles of 50% IPA
--- End quote ---
I've never seen 50% isopropyl for sale.  The common stuff is 70% ("Rubbing Alcohol"), which sometimes goes on sale for about $1/16oz.

--- Quote ---50% doesn't disinfect
--- End quote ---
Really?  I though whiskey was moderately effective as a disinfectant (at 80 proof or 40%)


--- Quote ---Gasoline de-icers are usually isopropanol.
--- End quote ---
Be careful; in the US, many de-icers are methanol, which is substantially more toxic that IPA.


--- Quote ---[99% IPA] is not even a product that can be sold freely. (something drugs related)
--- End quote ---
I've heard that.   But it's also available at the local grocery store.  I was behind a woman who was buying 4+ bottles once.  She mentioned to the cashier that she worked at a Stanford Bio lab, and it was less of a hassle to get at the grocery than it was to order from their technical suppliers...

tooki:

--- Quote from: westfw on July 03, 2019, 11:54:15 pm ---The geographical dependencies are ... interesting.

--- Quote ---a common "sanitary alcohol" is 70% ethanol.
--- End quote ---
In the US, the standard seems to be 70% IPA.  I don't know why.

--- End quote ---
Because 70% is the concentration for optimal effectiveness as a disinfectant. Above this, the alcohol actually coagulates the cell walls of bacteria instead of dissolving them, causing reduced disinfecting action.

Additionally, the water slows down evaporation, which can be useful in disinfecting to make sure there's enough time to dissolve the germs. (Whereas in technical applications, this can be a distinct disadvantage.)

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