xionoland - 10-6-2011 at 11:49
A suposed 98% air sealed propionyl chloride is dark brown in color. Isn't that chemical suposed to be clear liquid? Maybe some of it have reacted with
moisture from air.
Ozone - 10-6-2011 at 15:00
The stuff I have made was 98+% and water-white. It also eats the caps off of scintillation vials. Butyryl chloride, ditto.
It may be photochemically reactive.
Cheers,
O3
woelen - 11-6-2011 at 03:15
Propionyl chloride, even when some of it has reacted with water, still must be colorless. The products of reaction with water also are colorless. If
yours is dark brown, then I'm afraid that it is a load of crap, not suitable for any serious experiments. You might have some luck with distilling off
the compound from the dark brown crap.
Arthur Dent - 11-6-2011 at 03:42
Maybe it reacted somehow with the bottle cap or the lining of the cap, melted it and dissolved it, and further reaction discolored the Propionyl
Chloride? Unscrew the cap and see what shape it is in... If that's the case, then as woelen suggested, you might want to try distillation.
A few MSDS sheets suggest these properties:
Density: 1.06
Melting point: -94 ºC
Boiling point: 77-79 ºC
Robert
DJF90 - 11-6-2011 at 04:01
It may be that his "air sealed" sample is actually an ampoule. The fact he can tell its a dark colour may hint that its a clear glass ampoule, as
opposed to an amber one which would exclude ultraviolet radiation from the sample (although it is possible to tell if something in an amber glass
vial/bottle is dark - so I'm just guessing). Try distilling it; don't forget a calcium chloride tube on your reciever adaptor to prevent the ingress
of moisture.
mr.crow - 12-6-2011 at 09:42
Maybe some sort of polymerization or condensation with the enol form. Sort of like the HVZ reaction
You could react it with sodium propionate to get propionic anhydride. That should be a lot better for long term storage.