Method of preparing ultraphosphoric acid
First Claim
1. A process for preparing ultraphosphoric acid which comprises:
- (a) bringing together in a reaction zone elemental phosphorus, a sufficient amount of oxygen in a free-oxygen containing gas to form phosphorus pentoxide, and sufficient water to form ultraphosphoric acid, the mole ratio of water to phosphorus pentoxide being less than 1;
1, to form a product stream;
(b) removing heat from the product stream to cool the product stream below the dew point of ultraphosphoric acid; and
(c) collecting the ultraphosphoric acid.
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Accused Products
Abstract
Ultraphosphoric acid containing a phosphorus to hydrogen ratio of greater than 1 can be prepared by bringing together in a reaction zone elemental phosphorus and a sufficient amount of oxygen in a free-oxygen containing gas to form phosphorus pentoxide, and a sufficient amount of water to form ultraphosphoric acid. The mole ratio of water to phosphorus pentoxide is maintained less than 1:1. Heat is removed from the product stream of the reaction zone to condense at least some of the ultraphosphoric acid which is then collected. In the preferred embodiment, a heat exchange fluid such as pressurized water is circulated through a cooling coil positioned to remove heat from the product stream of the reaction zone. The ultraphosphoric acid can be combined with water to provide polyphosphoric acid.
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Citations
14 Claims
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1. A process for preparing ultraphosphoric acid which comprises:
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(a) bringing together in a reaction zone elemental phosphorus, a sufficient amount of oxygen in a free-oxygen containing gas to form phosphorus pentoxide, and sufficient water to form ultraphosphoric acid, the mole ratio of water to phosphorus pentoxide being less than 1;
1, to form a product stream;(b) removing heat from the product stream to cool the product stream below the dew point of ultraphosphoric acid; and (c) collecting the ultraphosphoric acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for preparing ultraphosphoric acid in a phosphorus burner which comprises:
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(a) bringing together in a reaction zone elemental phosphorus, a free-oxygen containing gas containing at least 30 percent in excess of stoichiometric amount of oxygen required to form phosphorus pentoxide, and sufficient water to form ultraphosphoric acid, the mole ratio of water to phosphorus pentoxide being at least about 1;
5 but less than 1;
1;(b) removing heat from the product stream by placing a cooling surface maintained between about 150°
C. and about 300°
C. to cool the product stream to below the dew point of ultraphosphoric acid;(c) condensing at least some of the ultraphosphoric acid on the cooling surface; and (d) recovering the ultraphosphoric acid. - View Dependent Claims (13, 14)
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Specification