Process for preparing high absorptivity granular sodium phosphates
AssigneeMonsanto Company
InventorsLouis A. Highfill, Kent P. Lannert
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Abstract
A process for preparing high absorptivity granular sodium phosphate mixtures made of sodium tripolyphosphate, pyrophosphates, metaphosphates and orthophosphates by hydrating and dehydrating a mixture comprising sodium tripolyphosphate in major proportion, and recovering the high absorptivity granular sodium phosphate mixture.
Claims9
A method of preparing high absorptivity granular sodium phosphates which comprises fully hydrating a mixture of phosphates comprising greater than 80% by weight granular sodium tripolyphosphate, dehydrating the hydrated mixture at a temperature in the range of from about 100.degree. C. to about 300.degree. C. and recovering the sodium phosphates comprising less than 80% by weight sodium tripolyphosphate.
A method of preparing high absorptivity granular sodium phosphates by hydrating a mixture comprising greater than 80% by weight granular sodium tripolyphosphate by adding water in an amount in the range of from about 15% to about 25%, by weight, by mixing said mixture with water in a device selected from the group consisting of a mechanical agitating mixer, a rotating horizontal drum hydrator, ribbon blender, mixing screw and vertical agglomerator, hydrating the hydrated mixture at a temperature in the range of about 100.degree. C. to 130.degree. C. and recovering high absorptive granular sodium phosphates.
Dependencies are inferred from the claim text.