HI/E flameability...

Sektor · Fri Sep 02, 2005 8:55 am

is the HI/E reduction flameable? swim is thinkin of sitting the vessel ontop of a plate on top of a gas burner for portablility so swim can go out in the wop wops to perform synth, other wise an electrical hotplate running off a power inverter from two 12 volt batts will be used, its just that the inverter is very very expensive, so if there is little chance of an HI/E reduction exploding whilst ontop of a gas burner this method will be preferd thanks

Sektor · Fri Sep 02, 2005 10:12 am

of course a pot of cooking oil placed on burner than the rxn veseel placed in oil

loki · guinea pig

make sure it's one that doesn't smoke (peanut is good)

flame is no problem in the reaction, if it gets going to fast it can go exothermic and the phosphorus burns but there is no reason why you could not make flame heat the heat source.

but anywhere else in the process is a recipe for disaster. virtually everything else involves things which would catch fire, some of them in more nasty ways than others.

Sektor · Fri Sep 02, 2005 3:23 pm

...excellent Twisted Evil

....

zub · Sat Sep 03, 2005 6:48 am

oxygen is the big enabler in rapid oxidation scenarios, and it isn't that difficult to deal out of the equation.
if you think about it.

loki · guinea pig

i kinda shouldn't assume it goes without saying - you gotta have a thermometer, in any case. flame heat is ok for evaporating aqueous salty solutions via steam bath type situation too.

oxidation is not a big issue because the reaction is sealed pretty much anyway in the common methods (p/p and reflux the use of a gas containment system is usual)

zub · Sat Sep 03, 2005 7:02 pm

pre-filling the gas containment system with an inert gas was what i was getting at.

loki · guinea pig

in this case carbon dioxide could be used, it's tendency to form acidic carbonates is not a problem in the highly acidic conditions

Sektor · Sun Sep 04, 2005 7:13 am

so really swims just gotta make damn sure that this gas is well contained(swims gonna use a 2ft braided hose and punch balloon taped up real well), swim will kick of the HI first, let settle for 20mins, add pfed, tape up the hose +balloon to top of flask, then place on heat (swims got a digital thermometer -50C>300C) and let it do its thing for the next 24 hrs, swim'll let you know how it goes, not quiet ready yet to go though

loki · guinea pig

well, there shouldn't be all that much flammable gases in the reaction except for a bit of phosphine, in any case, containment is sensible Very Happy