Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing
Patent
1979-01-04
1980-05-13
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Halogen containing
423319, 423467, 423483, C01B 2510, C01B 2516
Patent
active
042028671
ABSTRACT:
An improved method for treating calcium phosphate sources such as bone phosphate and phosphate rock with fluorosulfonic acid in the presence of a limited amount of moisture whereby over 98.00% of the phosphorous is converted to volatile compounds that can be subsequently hydrolyzed. A substantial excess of fluorosulfonic acid is utilized to contact the phosphate ore as a slurry. The phosphorous products are primarily phosphorous pentafluoride and phosphorous oxyfluoride, and to a limited extent difluorophosphoric acid. A trace of water apparently catalyzes the reaction. The production of phosphorous pentafluoride is favored by up to one part of water to eight parts of ore by weight in the presence of excesses of fluorosulfonic acid. The method includes the hydrolysis of the volatile compounds to phosphoric acid and hydrogen fluoride. Hydrogen fluoride is then recycled to react with the required sulfur trioxide to make the requirement of fluorosulfonic acid for the process. Fluorosulfonic acid not consumed in the process is recovered for reuse in the process. Dependent on the form of silica impurities in the ore, a net production of hydrogen fluoride may be obtained from the fluoride content of the rock. The process is relatively self-sustaining as far as hydrogen fluoride used for making fluorosulfonic acid requirements is concerned. Sulfur trioxide is essentially the net reagent required to treat the ore to produce the volatile phosphorous intermediates for subsequent conversion to phosphoric acid and hydrogen fluoride.
REFERENCES:
patent: 2975034 (1961-03-01), Leech et al.
patent: 3044855 (1962-07-01), Young
patent: 3426659 (1969-02-01), Wiesboeck
patent: 3428422 (1969-02-01), Wiesboeck
patent: 3584999 (1971-06-01), Wiesboeck
Cannon Curtis W.
Hall Robert N.
Climax Chemical Corporation
Heller Gregory A.
Vertiz O. R.
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