Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1981-04-16
1983-06-28
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423310, 423319, 423415A, 423430, 423359a, 26050115, 562597, 564152, C01B 1516, C01B 2526
Patent
active
043905099
ABSTRACT:
A process for the manufacture of phosphoric acid from phosphate rock is provided. The phosphate rock is digested or acidulated with an acid solution containing oxalic acid to produce phosphoric acid and calcium oxalate. Useful by-products are also formed and include calcium carbonate and ammonium oxalate. More specifically, the process provides for the production of phosphoric acid, ammonium phosphate and useful by-products utilizing synthesis gas and air to produce oxalic acid and ammonia. The synthesized oxalic acid is utilized for phosphate rock digestion to produce phosphoric acid, which can be reacted with ammonia to produce ammonium phosphate. Calcium oxalate from phosphate rock digestion is utilized to produce calcium carbonate, ammonium oxalate and oxamide.
REFERENCES:
patent: 2718453 (1955-09-01), Beckman
patent: 3337297 (1967-08-01), Cook et al.
patent: 4108957 (1978-08-01), Michel
patent: 4118589 (1978-10-01), Cassar et al.
O'Neill Padraic S.
Weston Charles W.
Agrico Chemical Company
Heller Gregory A.
Vertiz O. R.
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