bahamuth
Hazard to Others
Posts: 384
Registered: 3-11-2009
Location: Norway
Member Is Offline
Mood: Under stimulated
|
|
Acquisition and use of non-lab molecular sieves for solvent drying
I have been for looking for a reasonable source of molecular sieves 3A for solvent drying.
Professional lab grade products are pricey...
So i was forced to look elsewhere and I have found several high quality products but they are not specifically made for solvent drying, as their
primary use is for insulated glass manufacture.
So my question is, have anyone tried using such products for drying solvents?
Brands found are Glasmol, Fenzi and such.
I ask because i had a mishap with using ebay sieves that turned into friggin clay in my solvent (ethanol).
Any sufficiently advanced technology is indistinguishable from magic.
|
|
|
Panache
International Hazard
Posts: 1290
Registered: 18-10-2007
Member Is Offline
Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein
|
|
I cannot speak or vouch for those products......
However i can vouch for the
DANFOSS ELIMINATOR
Available at all good refrigeration supply outlets world wide.
You will need a hammer.
|
|
|
Sulaiman
International Hazard
Posts: 3692
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Online
|
|
I bought cheap '3A' molecular sieves via eBay
for drying ethanol,
first use I got a lot of dust suspended in my ethanol
AND the sieves absorbed quite a lot of my ethanol.
After washing and drying and using the filtered dusty ethanol/water
there was very little 'dust' but they still absorbed quie a lot of ethanol,
and the final product was about 98.8% ABV
So overall not very good.
I believe thst the '3A' sieves that I received are 3A to 4A, maybe more,
they are probably what you would get if you ordered sieves for windows as 4A still absorb water.
If (like most of us) you are financially constrained,
you could investigate dry rice, wheat bran etc.
I have read that there are quite a few options for drying ethanol but I've not tried alternatives yet so I can't help much.
CAUTION : Hobby Chemist, not Professional or even Amateur
|
|
|
Fyndium
International Hazard
Posts: 1192
Registered: 12-7-2020
Location: Not in USA
Member Is Offline
|
|
Apparently MgSO4 will make EtOH quite dry and final drying can be done with CaO.
|
|
|
bahamuth
Hazard to Others
Posts: 384
Registered: 3-11-2009
Location: Norway
Member Is Offline
Mood: Under stimulated
|
|
I know there are many ways of drying EtOH but this thread is about molecular sieves, specifically ones that are not lab grade.
The reason I mentioned EtOH was that it was the first of many solvents I wanted to purify and dry.
I have liters of dirty/wet solvents that I plan to distill and dry, conveniently.
And to have something I can reuse for drying many many times is worth a lot to me.
The cost for molecular sieves that are for insulated window use, is about 25x cheaper than lab grade stuff.
Any sufficiently advanced technology is indistinguishable from magic.
|
|
|
Fyndium
International Hazard
Posts: 1192
Registered: 12-7-2020
Location: Not in USA
Member Is Offline
|
|
Absolutely, just wanted to note that single use MgSO4 and CaO can be very cheap, from 0.5€/kg so reusing is much more costly than discarding,
because it's not for dedicated mass production use. Trans-contamination between different solvents and explosion hazard of evaporating vapor residues
are to be concerned.
Non-lab grade sieves also bring costs from trial and error and degradation, etc so relative costs can quickly justify using lab grade instead of
cheap-off grade.
[Edited on 20-2-2021 by Fyndium]
|
|
|
Fyndium
International Hazard
Posts: 1192
Registered: 12-7-2020
Location: Not in USA
Member Is Offline
|
|
MgSO4 mixed with CaSO4 about 10% w/w stirred overnight did not produce difference in azeotropic ethanol after distillation. Either something I did
wrong, or it does not work.
NurdRage clearly demonstrates that cheap sieves absorb none to some of the water, but also other molecules, because they are not exactly 3A.
Do the lab grade sieves warrant the high price? The off-brand 3A cost between 15-40e/kg, and the lab grade seems to go around 150e/kg.
|
|
|
WGTR
National Hazard
Posts: 971
Registered: 29-9-2013
Location: Online
Member Is Offline
Mood: Outline
|
|
I realize that none of you are in the United States. Have you considered a place like Delta Adsorbents? I have purchased from them before. Bulk
prices are very reasonable. I purchased 10 lbs from them and sold off about 5 lbs to someone else here. This split the cost between us for a far
cheaper price that one could achieve by buying 5 lbs directly, about $30 each plus shipping costs. I have plenty of my own now, but if you can find
one or two other people nearby who would like to split a purchase then this can be very economical.
|
|
|
paulll
Hazard to Others
Posts: 112
Registered: 1-5-2018
Member Is Offline
Mood: It's fine. Really.
|
|
| Quote: | | Have you considered a place like Delta Adsorbents? |
25USD for 1lb of 3A ... but 50USD shipping. Oof. Plus the shipping's UPS so probably another 100USD in, "brokerage fees," and then the frustration of
paying all that money for the item to disappear into oblivion.
Nice thought while it lasted lol
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
