Apparatus for the production of hexagonal phosphorus pentoxide

In an apparatus for making phosphorous pentoxide comprising means defining a horizontally disposed combustion chamber, a two component combustion nozzle for feeding elementary phosphorous and oxygen to the combustion chamber and outlet means for discharging products of combustion, the nozzle means and outlet means being disposed at opposite ends of the combustion chamber, means defining a vertically oriented condensation chamber provided with inlet means for receiving products of combustion from the combustion chamber, off-gas outlet means at the upper end of the condensation chamber and being adjacent to the inlet means, the condensation chamber further having means for cooling the walls thereof, outlet means with locking means therein for discharging condensed hexagonal phosphorous pentoxide and receiver means for receiving the discharged phosphorous pentoxide, wherein the improvements comprise a vertically disposed tube being located within the condensation chamber with one end thereof connected to and communicating with the inlet means for the condensation chamber and the other end terminating above the bottom portion of the condensation chamber and a plurality of helically wound bundled cooling pipes being disposed along the inside wall of the combustion chamber and the inside wall of the vertically disposed tube whereby hexagonal phosphorous pentoxide is produced.