| 摘要 |
<PICT:0957844/C1/1> In a fluidized bed reactor, the exhaust gases from the bed are cleaned, cooled and blown back into the base of the reactor as fluidising gases for the bed. The apparatus is described as being utilized for the cooling and condensing of P2O5 vapours. Liquid phosphorus enters a combustion chamber through 1 and is oxidized by dry air entering through 2. The product, which contains excess air, nitrogen and gaseous P2O5 flows through conduit 3 via a loop-seal and extension 5 into a bed 7 of fluidized P2O5 particles which is cooled by plates 8 and supported on a gas distributing plate 12 in a collector vessel. The fluidizing gases pass from windbox 13, through plate 12 and into bed 7, and the residual gases leave via space 14 and conduit 15, passing into a cyclone where the large particles entrained in the gases are precipitated and returned to the bed via dipleg 16. The gases pass on via 17 to the wet scrubber where the very fine particles are removed by a liquid e.g. concentrated phosphoric acid, which does not cause appreciable humidification of the fluidizing gases. Next the gases flow through an optional heat exchanger, where they are further cooled, and then via 25 through the blower back to windbox 13. The apparatus is preferably operated above atmospheric pressure to reduce the ingress of moisture from the outer air to a minimum. The P2O5 produced by this type of apparatus is disclosed and claimed in Specification 951,383.
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