Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1985-06-05
1986-07-29
Doll, John
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
422188, 422200, 422202, 423317, C01B 2512
Patent
active
046030395
ABSTRACT:
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.degree. to 600.degree. C. under constant pressure, and for the steam so superheated to be used.
REFERENCES:
patent: 4379131 (1983-04-01), Daniel et al.
VDI Warmeatlas, 4th Edition, 1984, p. Dd 1, "Application limits of heat carriers".
Technik-Lexikon, 1972, pp. 569 and 570.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Ed., vol. 21, John Wiley & Sons (1983), pp. 507, 508, 542.
Klemm Walter
Kuxdorf Bernhard
Luhr Peter
Thummler Ursus
Werner Hugo
Doll John
Hoechst Aktiengesellschaft
Langel Wayne A.
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