purification of NMP

fcknut · Thu Jul 14, 2005 9:03 pm

Howdy,

I'm planning to distill some NMP to get it dry (the sure-seal is starting to concern me...).

I'm thinking a stragiht-forward vacuum distillation from calcium hydride and collection onto molecular sieves will do the trick.

Anyone have any experience of drying NMP - any good methods?

Cheers

joe_aldehyde · huxleys associate

you would sure want to have a look at the e-books section first, where it says "purification of...". thank you

fcknut · Fri Jul 15, 2005 2:01 pm

well thanks for your reply which I'm assuming you intended to be patronising. If so, well done. You're obviously very clever.

Anyway, in a further request to those of you who aren't muppets, anyone have experience with drying NMP? Or see any reason why distilling from calcium hydride should not work?

Maybe I should have pointed out that the route described in the purification of lab chems involved azeotroping with benzene followed by fractional distillation on a 1 metre column. For a number of reasons, this does not appeal to me...

joe_aldehyde · huxleys associate

well, no patronising intention, maybe you should have included the note that you have previously looked up the method in the relevant ebook.
you sure do understand that it is utterly annoying, having to deal with posts that say "how do i do this or that" which could have been answered by the authors themselves by reading chemistry books.
i even wonder how people come to ask "whats the molar mass for mda freebase" AFTER they have made it! how can anyone be so dumb and not know the very basics of chemistry and attempt a synthesis? it's not a surprise to me anymore that many clandestine labs go boom in the middle of a synth...

fcknut · Sat Jul 16, 2005 4:03 am

Fair enough, maybe i should have included the fact that I have looked for this information already - I suppose I just take it as read that when someone asks a question they've thought about it and done the obvious things first.

Probably a stupid assumption... Rolling Eyes

anyway, nothing clandestine about me, just looking for a little experienced advice.

fcknut · Mon Aug 22, 2005 6:15 pm

well, if anyone was interested - i did find a reference (forget it now) where they distilled their NMP from CaH2 onto activated 4A seives, so this is what I have done, and it seems to have worked...