Method of producing sodium aluminum phosphate
AssigneeFMC Corporation
InventorJohn S. C. Chiang
Life of this patent
Estimating the term…
Abstract
A method of spray drying 1-3-8 sodium aluminum phosphate reaction mixtures by the steps: (A) forming an aqueous 1-3-8 SALP reaction mixture by reacting Na.sub.2 CO.sub.3,Al(OH).sub.3 and H.sub.3 PO.sub.4 in a Na:Al:PO.sub.4 atomic ratio of 1:3:8 at a water content between about 30% and about 48% and in the presence of an effective amount of a non-toxic, substantially, water soluble metal sulfate as a precipitation inhibitor; (B) adding sufficient water to (A) to form a sprayable solution, and (C) spray drying the solution of (B) and recovering the dried product.
Claims7
A method of spray drying 1-3-8 sodium aluminum phosphate reaction mixtures comprising the steps:
- A. forming an aqueous 1-3-8 SALP reaction mixture by reacting Na.sub.2 CO.sub.3,Al(OH).sub.3 and H.sub.3 PO.sub.4 in an Na:Al:PO.sub.4 atomic ratio of 1:3:8 at a water content between about 30% and about 48% and in the presence of an effective amount of a non-toxic, substantially, water soluble metal sulfate as a precipitation inhibitor;
- B. adding sufficient water to the precipitation free, clear 1-3-8 SALP reaction mixture from step A to ensure a SALP content of from about 10% to about 55%:
- C. spray drying the 1-3-8 SALP solution of step B, and
- D. recovering the spray dried product.
Dependencies are inferred from the claim text.