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Polycone cap chemical compatibility
Plastic like HDPE is not ideal for harsh organics. And cheap plastic caps and liners are a pain, A ... |
9-12-2018 at 20:08
by: Dr.Bob |
Cleaning Glas Cols?
I would guess that you need a better stir bar, I use a Corning hotplate often and can stir well righ ... |
7-12-2018 at 18:28
by: Dr.Bob |
Cleaning Glas Cols?
Don't overheat them to clean, it will make them worse. The key thing is to regulate the power to ... |
2-12-2018 at 16:07
by: Dr.Bob |
Tosyl sulfonhydroxamic acid
Hydroylamine is pretty safe when in solution, the key is to extract any excess hydroxylamine materia ... |
2-12-2018 at 16:05
by: Dr.Bob |
Fractionating colums and application...
Anything that holds the packing in the column is fine. You want material with much surface area and ... |
29-11-2018 at 15:23
by: Dr.Bob |
Upcoming Sales
I still have some things left, but mostly adapters, dist heads, adapters, and more, all used US made ... |
18-11-2018 at 17:00
by: Dr.Bob |
Any demand for triphenylphosphine?
Triphenylphosphine is very useful, but many batches I have seen are already partly oxidized to the o ... |
15-11-2018 at 12:53
by: Dr.Bob |
Sourcing Ethyl Acetate?
Where are you located? Sometimes there are good sources, but they are highly localized. There is a ... |
12-11-2018 at 17:44
by: Dr.Bob |
Looking for cheap bottles, 250, 500, 1000ml. Any recommendations?
Yes, they do, for almost as much as the entire bottle and cap in the cases that I looked. Plus the ... |
12-11-2018 at 17:27
by: Dr.Bob |
Vacuum Aspirator Problems
That aspirator looks very small and short which will not produce as much vacuum as a good one. I w ... |
12-11-2018 at 08:26
by: Dr.Bob |
Hazardous concerns
Ritter reaction should be fine, no real risk of HCN generation, but the amount of sulfuric used does ... |
8-11-2018 at 06:47
by: Dr.Bob |
Looking for Information on 2-nitrotoluene
I don't see the distillation of C60(PhCH3NO2)12 being a good option, no matter what ratio of product ... |
24-10-2018 at 18:03
by: Dr.Bob |
Glas-col sizes?
Some of the 500 ml mantles are flat and flexible enough to be able to wrap around a 250 but also fla ... |
3-10-2018 at 17:16
by: Dr.Bob |
Science equipment looking for a home
Here is a newer spreadsheet, not too many changes, but a few.
Got a few 250 and 500 ml filter ... |
1-10-2018 at 18:14
by: Dr.Bob |
Fractionating colums and application...
I think the spiral is not actually attached to the column, thus just a simple column with a spiral t ... |
27-9-2018 at 12:33
by: Dr.Bob |
NMP - Purification - Ideas?
[rquote=538630&tid=13465&author=MrG]I want to remove NMP from GBL. Could I do this by freezi ... |
27-9-2018 at 12:22
by: Dr.Bob |
NMP - Purification - Ideas?
Its really hard to purify NMP and get it dry. If you can find any source of the pure material, it ... |
26-9-2018 at 07:08
by: Dr.Bob |
Science inspired travel
Can't go wrong in Florence, the smallest and worst museums and churches there have art that is still ... |
26-9-2018 at 07:03
by: Dr.Bob |
Hydrogen
Transfer hydrogenation used sodium formate quite often, which reacts with Pd/C to generate H2 and CO ... |
24-9-2018 at 07:27
by: Dr.Bob |
How to deal with oil mist on vacuum pumps?
They make mist catching filters that go on the exhaust. They slow down the roughing, but don't real ... |
20-9-2018 at 17:48
by: Dr.Bob |
Best locking mechanism for glass Flash Chromatography? Keck clips don't work.
I've rarely had a keck clip pop off, so I agree that you may be using too high a pressure. I always ... |
20-9-2018 at 17:45
by: Dr.Bob |
Expensive bottle cap's and their resistant liners
If anyone is looking for smaller bottles, I found two more cases of 60 ml Boston rounds from Qorpak, ... |
19-9-2018 at 17:06
by: Dr.Bob |
Flame heating (larger) RBFs?
And remember, the thicker the flask, the less evenly it will heat and expand, so thin glass is bette ... |
19-9-2018 at 06:18
by: Dr.Bob |
Ethyl bromide synthesis not working
Using truly anhydrous ethanol will improve the yield as well. If you have 3-4 equivalents of etha ... |
17-9-2018 at 15:44
by: Dr.Bob |
Expensive bottle cap's and their resistant liners
There are already PTFE cap liners for sale by some company, I have seen bags of them over time. Mi ... |
15-9-2018 at 11:05
by: Dr.Bob |
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