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HoH
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Thank you for the replies.
If I may ask, when using EtOAc for organic phase extractions, do you lose some of the ethyl acetate to water? I have noticed that when using DCM in
the same manner, you lose a percentage of DCM to H2O after separation of the non-polar phase. Is this the same for Ethyl Acetate or should you be able
to recover 100% of the solvent without any loss?
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macckone
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Quote: Originally posted by HoH  |
If I may ask, when using EtOAc for organic phase extractions, do you lose some of the ethyl acetate to water? |
Solubility in water is 8.3g/100ml at 20C.
So yes, there is a lot of loss.
This also effects your yields.
Ethyl ether is 6.9g/100ml so it isn't
a lot worse then that.
But chloroform is .8g/100ml and
hexane is practically insoluble.
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HoH
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I apologize, I completely forgot that info is on the MSDS. It seems that DCM would be a better alternative but a more costly alternative.
Last night I picked up a quart of MEK substitute from Home Depot and as I am distilling it, I am noticing the thermometer is reading 66c as the
mystery solvent is distilling one drop per second. The oil bath is reading 92c.
To my knowledge, 66c is Tetrahydrofuran! Ethyl Acetate was expected to read 77c, hence my setting the temp of the oil bath to the low 90's to
compensate 10 degrees. If ethyl acetate was present wouldn't it be distilling over at this temp, registering on the thermometer?
It has been a while since I had ethyl acetate so my sense of smell/chemical detection may be off, but it smells like EtOAc.. but it also kinda smells
like THF.  I usually associate THF with the smell of OTC wart remover, and it
kinda smells like that as well.
Did Klean Strip possibly change the formulation, rather than discontinue MEK substitute? So far I see about 50ml in the receiver flask and the vapor
temp has not budged and there is no sign of slowing up as 1 drop/sec continues to distill.
Thoughts? Not sure which I like better, THF or EtOAc for 9.98/qt. Both are good deals imo.
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splooge
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This may seem naive but amazon has H2SO4, NaOH, and KNO3 after a really short search. H2SO4 was 30 bucks for a gallon of conc..
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S.C. Wack
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It was $16 a gallon at Lowe's. There are no gallons anywhere in town and there is no way I'm paying $10 a quart at HD. Lowe's has gone exclusively to
the Crown brand for solvents now, lameness...
Perhaps the discontinuation was the realization they could neither continue to sell gallons for $16 even if that was profitable, nor sell at $10 a
quart.
Perhaps the thermometer weirdness is thermometer weirdness, and purity would be best determined by large scale conversion to ethanol and either sodium
acetate or acetamide.
Get your chem gear while it's available. Much like the forklift at work, do not count on it being there at the time you want to use it.
I was walking out of the HD in another town today, saw a sign that said POTASSIUM CRYSTALS
...it was of course KCl for water softeners or something.
[Edited on 14-3-2014 by S.C. Wack]
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Texium
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Lowe's sells Roebic brand drain cleaner which claims to be 100% lye. There's no aluminum chips or anything in it, just two pounds of crystal NaOH.
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Fantasma4500
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for acetone it could be done in excess
without having checked up on it but recalling something about it i was explained by a person i talk to that acetic acid can be made by letting oxygen
get into your reaction chamber with yeast and sugar
perhaps CaCO3 could be dumped into this mixture to INSTANTLY react the acetic acid to get calcium acetate
this could then be dumped into a large metal can with fitted lid and metal tube to be decomposed into acetone at somewhat high temperature, the
reaction apparently first starts at something around 500*C if im not totally off, but it surely could be done in a considerable bulk, making the
calcium acetate could be a small side project that could basically have itself going without much more than some more sugar, yeast and water added
once in a while
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Illusionist
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Found a great source for pure NaOH and KOH, soap making stores have it.
www.saffireblue.ca
CDN $7.81 for 1KG NaOH
$9.60 for 1kg KOH
they also have good price on boston round bottles.
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subsecret
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Try Ace Hardware if you live near one. That's where I found Rooto sulfuric acid and sodium hydroxide. Always check hardware stores when you travel.
Though sulfuric acid was available at my local store, I couldn't find any sodium hydroxide, but finally found some when traveling in the adjacent
state.
Fear is what you get when caution wasn't enough.
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Polverone
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Those Klean-Strip teases are taking away the ethyl acetate now?! I was bummed when they discontinued the ethyl lactate "multi purpose natural
solvent." On the upside this means that next year I can probably acquire a cheap stock of some other ethyl ester from their revised product lineup.
PGP Key and corresponding e-mail address
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Bert
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| Quote: Originally posted by Polverone | | Those Klean-Strip teases are taking away the ethyl acetate now?! I was bummed when they discontinued the ethyl lactate "multi purpose natural
solvent." On the upside this means that next year I can probably acquire a cheap stock of some other ethyl ester from their revised product lineup.
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They've ALREADY brought back real MEK! Perhaps they've given up on "green" replacements?
I went and bought out the local Home Depot's supply of the ethyl acetate "MEK replacer" just in case- But they only had 8 quarts. They never
re-stocked, it would seem that when it's gone, it's GONE.
Pity, it made a decent replacement for amyl acetate, which I had formerly used in combination with acetone as a somewhat longer "open working time"
solvent for nitrocellulose bound pyrotechnic compositions. Making NC bound "dragon's eggs" is a pain when the dough dries in an eye blink.
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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Etaoin Shrdlu
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There was a shortage of MEK in 2011, then another price hike recently; it's more or less better now. I suspect that drove the change to ethyl acetate
in the first place rather than any actual interest in being "green". Off the top of my head they're similar in price.
EDITED for clarity. And punctuation. Possibly repeatedly.
[Edited on 4-28-2014 by Etaoin Shrdlu]
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hyfalcon
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I picked up the last gallon of the Klean Strip MEK substitute. Last one in the Local Lowes. Never to be replaced since the switched to Crown
solvents. Looks like the Home Depot still carrys the quarts but that's way over priced. Funny thing is, Klean Strip makes a 5 gallon can, but you
can't find it anywhere without something like $180.00 delivery.
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gdflp
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Just went to Home Depot, they have Klean Strip Green Denatured Alcohol which is actually almost pure denatured ethanol, at least 90% according to the
MSDS with a few percent of Methanol and MIBK to lower the tax. Much better IMO than their normal denatured alcohol which is like 50-50 EtOH and MeOH.
EDIT : What are you using 5-gallons of EtOAc for?
[Edited on 28-4-2014 by gdflp]
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