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US 4,714,600 AGranted
Process for production of phosphoric acid from dry matrix by SO.sub.3 treatment and extraction
AssigneeMobil Oil Corporation
InventorsPatrick R. Driscoll, Ross A. Kremer
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Abstract
Phosphoric acid is produced from dry phosphate ore, matrix by acidulation with sulfur trioxide in the presence of sulfuric acid catalyst to form polyphosphoric acid, treatment with sufficient water to convert the polyphosphoric acid to orthophosphoric acid and extraction with water or organic solvent such as a lower alcohol, particularly methanol or ethanol.
Claims6
A process for producing phosphoric acid from phosphate ore matrix comprising:
- (A) drying the phosphate ore matrix;
- (B) acidulating the dry matrix with sulfur trioxide in the presence of sulfuric acid catalyst;
- (C) removing said sulfur trioxide from the matrix;
- (D) treating the acidulated matrix with sufficient water to convert phosphorus values to orthophosphoric acid;
- and
- (E) extracting the orthophosphoric acid with methanol or ethanol.
3 more elements
Dependencies are inferred from the claim text.