04-22-03 01:40
No 428591
I've read that xylene(dimethylbenzene), as a mixture of its three isomers, boils at 137*C - 140*C at normal pressure. - The Penguin Dictionary Of Science
Since butyrolactone boils at 204 - 205*C, won't it be easy to separate the two solvents?
Love my country, fear my government.
(arrogant bee of the day)
04-22-03 03:03
No 428601
Yes, also you could convert it to NaGHB and then seperate the xylene off the top.
(PVC-Analog Taste-Tester)
04-22-03 23:16
No 428876
Thanks for the advise! I wouldn't know how much butyrolactone was in the xylene, so the amount of needed hydroxide isn't known. The bromate/bisulfate/THF synth says 80% yield of butyrolactone, but I'd prefer to distill off the xylene first. In my dreams, xylene would be used because DCM isn't cheap to ship(haz-mat), and it smells like chloroform.[insert vomiting smiley here.] I get plenty of sodium in my diet, so KOH sounds better. Peace!
Love my country, fear my government.
(Synaptic Self-Mutilator)
04-23-03 16:27
No 429046
Water holds onto the GBL far better than xylene does, and better than DCM does... although I believe it's miscible in all three. Moral: don't use xylene to extract GBL from water--use ethyl acetate, DCM, etc.
I assume there's no surfactants in the mixture, if there is... give up hope. This is what I'd do with your mixture:
While stirring, titrate with 10% NaOH to a pH of 12. Dicard the organic layer. Then from there, acidify the aqueous with ~15% sulfuric acid until the pH is around 1 (go slow) and extract that with DCM (equal volume to the aqueous, but split it into 5 extractions... ie if it's 500ml aqueous, extract 5x100ml DCM), simple distill off the DCM with no vacuum and fractionally distill GBL under vacuum.
Good luck and let us know how it goes. If you have any luck with THF->GBL I'd love to hear it.
(Hive Bee)
04-23-03 19:05
No 429063
Bwiti, even though you get plenty of sodium, getting too much potassium can be a very bad thing.. www.ghbinfo.com says why..
just a heads up :)
(PVC-Analog Taste-Tester)
04-25-03 07:19
No 429333
Good luck and let us know how it goes.
Well, all I can say is Don't scale it up to a mole sized batch! Unless you don't mind a HUGE cloud of bromine gas. Extreme over-heating, causing cracking of glass vessel, and the risk of choking to death isn't my idea of a good time. If anyone else wants to try to pioneer this method, then use a lot more H2O, and for fuck's sake, add the bromate/bisulfate slowly! This was the most dangerous accident I've had, and I don't plan on fucking with bromine any time soon. That was some scarry shit! I'd rather tinker with essential oils, ketones, etc.. Peace
Love my country, fear my government.
(PVC-Analog Taste-Tester)
04-25-03 07:24
No 429335
Btw, overheating occurred a few hours after everything was mixed-up. Be careful, it's a delayed melt-down.
Love my country, fear my government.
(Synaptic Self-Mutilator)
04-25-03 13:18
No 429389
All I've got to say is use a good system of temperature control. It must not be cooled excessively, or the reaction will not happen. If it's allowed to run on it's own, you'll have the mixture spattered on your ceiling and perhaps worse.