James K Wilson
Radiology at Liberty Ln, Lakeland, FL

4828811, May 9, 1989

Jul 28, 1987

7/078608

Gary D. Derdall - Saskatoon, CA
William R. Erickson - Lakeland FL
Robin L. Phinney - Saskatoon, CA
James D. Wilson - Lakeland FL

Potash Corporation of Saskatchewan - Saskatoon

C01B 2516

423319

A process and apparatus for producing phosphoric acid by the recovery of P. sub. 2 O. sub. 5 from a phosphate ore is disclosed. A slurry of a phosphate ore in an aqueous phosphoric acid solution is formed in each of a plurality of reaction zones connected in series. Phosphate ore is introduced into the first reaction zone and phosphoric acid into the last reaction zone whereby the reaction of the phosphoric acid with the ore forms a slurry of coarse solids, fine solids and monocalcium phosphate in the phosphoric acid solution. A first process stream comprising coarse solids is removed from the first reaction zone and each of the other reaction zones and is transferred to the adjacent, successive reaction zone. A second process stream comprising fine solids is removed from the last reaction zone and the other reaction zones and is transferred into the adjacent, preceding zone in a direction which is countercurrent to the direction of flow of the first process stream and is concurrent with the direction of flow of the phosphoric acid from the last to the first reaction zones. A differential of phosphoric acid concentration is maintained between the reaction zones with the concentration decreasing in each reaction zone in the direction of flow of the first process stream.

4885148, Dec 5, 1989

Sep 6, 1988

7/240609

William R. Erickson - Lakeland FL
Donald B. Stain - Lakeland FL
James D. Wilson - Lakeland FL

Phosphate Engineering & Construction Co., Inc. - Lakeland FL

C01B 1516, C01B 2526

423309

Relatively pure monopotassium phosphate is produced from wet process phosphoric acid in a process wherein the phosphoric acid is mixed with potassium chloride and recycled components from downstream product and by-product recovery steps and heated to permit hydrogen and chloride to evolve from the melt as gases and wherein the melt is subsequently treated so as to remove impurities so that the monopotassium phosphate may be recovered as a relatively pure crystalline product with low chloride content.

5093088, Mar 3, 1992

Feb 14, 1989

7/310095

Gary D. Derdall - Saskatoon, CA
William R. Erickson - Lakeland FL
Robin L. Phinney - Saskatoon, CA
James D. Wilson - Lakeland FL

Potash Corporation of Saskatchewan - Saskatoon

B01J 800

422189

An apparatus for producing phosphoric acid by the recovery of P. sub. 2 O. sub. 5 from a phosphate ore is disclosed. A slurry of a phosphate ore in an aqueous phosphoric acid solution is formed in each of a plurality of reaction zones connected in series. Phosphate ore is introduced into the first reaction zone and phosphoric acid into the last reaction zone whereby the reaction of the phosphoric acid with the ore forms a slurry of coarse solids, fine solids and monocalcium phosphate in the phosphoric acid solution. A first process stream comprising coarse solids is removed from the first reaction zone and each of the other reaction zones and is tranferred to the adjacent, successive reaction zone. A second process stream comprising fine solids is removed from the last reaction zone and the other reaction zones and is transferred into the adjacent, preceding zone in a direction which is countercurrent to the direction of flow of the first process stream and is concurrent with the direction of flow of the phosphoric acid from the last to the first reaction zones. A differential of phosphoric acid concentration is maintained between the reaction zones with the concentration decreasing in each reaction zone in the direction of flow of the first process stream.