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Author: Subject: Boron Tribromide from Boron and Bromine in grey iron pipe?
bmays
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[*] posted on 16-10-2014 at 11:35
Boron Tribromide from Boron and Bromine in grey iron pipe?


Would this work? Or the pipe would explode from bromine pressure?
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[*] posted on 16-10-2014 at 11:39


Seems feasible, but dangerous. You would need to purify it from the iron tribromide, likely with vacuum distillation.
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[*] posted on 16-10-2014 at 14:37


Indeed. I wonder if the bromine would eat straight through and breech the pipe. Now that would be a nasty bomb. I wonder what the actuall pressure would be, probably way too high for safety. I wonder what temp is even required. Wikipedia says under 300c, a post on here says 600-750c.

Probably easier just to go the KBF4 and AlBr3 route. Oh well, too hard that will be a future project. No idea where to get or how to prepare tetrafluoroborate, never worked with flourine ever.
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[*] posted on 16-10-2014 at 16:13


http://boron.atomistry.com/boron_tribromide.html
" Boron tribromide, BBr3, its preparation and purification may be carried out as described for the chloride "


http://boron.atomistry.com/boron_trichloride.html
" For the synthesis, impure boron (prepared by heating the oxide with magnesium and boiling the resulting mass with hydrochloric acid) is employed. It is heated to dull redness in a stream of dry hydrogen, allowed to cool in the gas, and, after displacing the hydrogen with chlorine, heated in chlorine to redness. The product is strongly cooled and protected from moisture, shaken with mercury or silver powder to remove chlorine, and fractionally distilled to eliminate hydrogen chloride and silicon chloride. Boron trichloride is also produced when boron sesqui-oxide is heated for some days at 150° with phosphorus pentachloride. "

http://books.google.com/books?id=WyOGAwAAQBAJ&pg=PA210&a...
starts at the top of page 208, multiple routes listed here

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