I am simply on a quest to find an effective non-distillation method for purifying isopropyl alcohol used for rinsing resin 3D prints.
I have seen some elaborate systems for curing and then filtering resin that is suspended in the isopropyl by running it through standard carbon water filters. That just seems a bit over-complex and does a poor job of removing dyes. In some cases, the filters are not fine enough and the isopropyl will eventually get “sticky”.
It seems to me that a finer filtration system would work much better. Carbon and celite should catch most of the monomers and oligomers, but I am not sure about the photoinitiators and other additives.
Distillation is obviously the best method for purity, but there may be a worse cleanup and a higher fire hazard risk.
Are there better materials that I could use for filtering besides celite and carbon? IPA is tiny compared to the rest of the molecules I am dealing with so filtration seems viable.
(I should note that I would bulk develop the used IPA in clear plastic containers in the sun for a day or two first.)
Exactly how pure are you trying to get? You can buy 99.5% pretty easily.
I have a stock of 99% IPA already that I use for cleaning the bed of my regular 3D printer, electronics cleaning and for drying things coming out of my ultrasonic cleaner. (I can use salt to drop any water out of IPA, actually.)
With resin 3D printing, my washer uses about a gallon of IPA and it will get super dirty after a while. For that particular case, it’s just going to be more efficient to clean the IPA and reuse it until it needs to be distilled. (Wishing the parts in stages will help reduce IPA use, actually. Water washable resin is an option, but I would rather not dump that water down the drain or hassle with hazmat disposal, when applicable.)
Oh, I missed that it was for 3d printing.
Maybe an actual chemist will chime in, but I couldn’t find any sources about purifying or recycling IPA, at least none that you could do at home. At a guess, maybe a reverse osmosis system without the finest membrane? Like you said, the water and IPA molecules should be smaller than the dyes and resins.
Maybe also consider washing with the dirty IPA, and just giving a rinse at the end with the clean IPA in order to conserve. Ultimately it sounds like everything I’ve found is material you’re already familiar with, unfortunately.