I feel like a real idiot asking this, but I can't seem to find a reasonably-priced Hempel column anywhere... cheap Vigreux columns abound, but I'd
like to try using a packed column for a few things... where can I get an inexpensive Hempel column?Magpie - 25-3-2016 at 15:13
What length and ID do you require? Do you require a ground glass fitting? If so, what size? What do you consider "inexpensive"?
[Edited on 25-3-2016 by Magpie]JJay - 25-3-2016 at 15:17
What length and ID do you require? Do you require a ground glass fitting? If so, what size? What do you consider "inexpensive"?
[Edited on 25-3-2016 by Magpie]
24/29 or 24/40, definitely with a ground glass fitting... it's hard to say what size is best, but 30 cm is likely a good one... inner diameter maybe 1
cm or so (bigger would work well).Magpie - 25-3-2016 at 15:35
Here's a supplier I can recommend: Eagle.JJay - 25-3-2016 at 15:39
Cool. I think Hempel columns should cost less (why on earth can I find a Liebig with free shipping for half the price of a same-size Hempel column),
but those are the best prices I have seen so far.Dr.Bob - 25-3-2016 at 16:57
If you want to really go out, then I have one vacuum jacketed Hempel column left, but it is S35 joints at both top and bottom, about 16" tall.
Fortunately, I have s35 jointed 1 and 2L rbfs, and I think I even have a distillation head for it somewhere, or at least can find one. But it might
cost a little more. But it is a beauty. I think I had some simple ones before, but don't have any simple 24/40 ones now.JJay - 25-3-2016 at 21:06
Right now I have nothing but 24/40 jointware, and I kind of like it that way.macckone - 25-3-2016 at 21:51
Try roccowareglassworks.com, they have relatively low cost hemples. But they aren't vaccuum jacketed.JJay - 25-3-2016 at 22:08
I think I'll be ok without a vacuum jacket.Sulaiman - 26-3-2016 at 00:37
An air condenser can easily be converted to a Hempel column,
and a Leibig condenser into a jacketed Hempel column.Dr.Bob - 26-3-2016 at 05:15
An air condenser can easily be converted to a Hempel column,
and a Leibig condenser into a jacketed Hempel column.
This is true, but the inside diameter will be very narrow, which limits the vapor flow a lot. You would want to find a Liebig with a larger inside
pathway in order to make that work well. But a hempel should be very easy to make, effectively just a long tube with 24/40 joints as each end and
few indents at the bottom to hold the packing material. But I would guess $40 is about the cheapest you will find a decent new one.JJay - 27-3-2016 at 00:46
I'm not sure my Liebig would work well as a Hempel column because it doesn't have any indentations. Also, I only have one Liebig (I should probably
get another one).chemrox - 27-3-2016 at 12:46
Keep an eye out on the used equipment market. Bob's would be an awesome column. You could use a 1L s30 flask- either he or I would sell you one for
$20. I bought a 16" 24/40 Hempel for $40 used. It's not nearly as nice as Bob's. Vacuum jacketed Hempel's cost big bucks.JJay - 27-3-2016 at 19:21
I'm probably just going to buy an air condenser from one of my usual suppliers and plug the bottom with glass wool, hoping that it won't fall out.
What can you do with a vacuum jacketed Hempel?gdflp - 27-3-2016 at 19:27
I'm probably just going to buy an air condenser from one of my usual suppliers and plug the bottom with glass wool, hoping that it won't fall out.
What can you do with a vacuum jacketed Hempel?
It's a much cleaner and better solution to insulating the column than wrapping it with fiberglass or aluminum. Insulated columns allow for faster
distillations, by preventing heat loss through the great surface area which a normal column possesses.chemrox - 28-3-2016 at 16:19
