MANUFACTURE OF PHOSPHORUS PENTAOXIDE

Japanese Patent JPS59213608

A

The disclosure relates to a process for making phosphorus pentoxide by subjecting elemental yellow phosphorus to combustion with dried air inside a steel-made combustion chamber with utilization of the reaction heat for the production of energy. To this end, the disclosure provides for the combustion to be effected inside a combustion chamber of which the walls are arranged so as to form a cooling system with cavities therein; for water or a water/steam-mixture as a heat carrier abstracting the reaction heat to be circulated through the cooling system, the water or water/steam-mixture assuming an increased temperature being circulated, preferably under increased pressure; for steam formed in the cooling system to be continuously taken therefrom; for an equivalent proportion of fresh desalted water to be introduced into the cooling system; for hot gaseous phosphorus pentoxide issuing from the combustion chamber to be condensed or worked up into phosphoric acid; for the steam taken from the cooling system to be passed through a steam delivery pipe disposed in the upper portion of the combustion chamber, or through a delivery conduit for product gas containing phosphorus pentoxide; for the steam to be heated therein to a temperature of 400 DEG to 600 DEG C. under constant pressure, and for the steam so superheated to be used.

BERUNHARUTO KUKUSUDORUFU
PEETAA RUURU
URUZUSU CHIYUMURAA
FUUGO BUERUNAA
BUARUTAA KUREMU

JP9311584A

December 03, 1984

May 11, 1984

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HOECHST AG

C01B25/12; C01B25/20; F22D1/02; F22B33/18; (IPC1-7): C01B25/12; C01B25/20; F22B33/18

JPS5484890A	1979-07-06
JPS54117394A	1979-09-12
JP36008922A

Toshio Yano

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