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Ammonia scavenger

  • US 4,460,555 A
  • Filed: 08/25/1983
  • Issued: 07/17/1984
  • Est. Priority Date: 08/25/1983
  • Status: Expired due to Term
First Claim
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1. A method for the preparation of a particulate substantially water-insoluble magnesium phosphate product which when slurried has a pH of from about 6.5 to about 8.5, having an empirical composition exclusive of water of hydration of the formula:

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    space="preserve" listing-type="equation">(Mg).sub.x (H).sub.y (PO.sub.4).sub.zwhereinx is from about 0.75 to about 1.4,y is from about 0.2 to about 1.5, andz is 1comprising the steps of(a) mixing magnesium hydroxide with water containing a phosphate ion-containing buffer having pH of from about 6.5 to about 8.5 to form a slurry;

    (b) slowly adding H3 PO4 to the slurry of step (a) to form a particulate substantially water-insoluble magnesium phosphate product having an empirical composition exclusive of water of hydration of the formula;

    
    
    space="preserve" listing-type="equation">(Mg).sub.x (H).sub.y (PO.sub.4).sub.zwhereinx is from about 0.75 to about 1.4,y is from about 0.2 to about 1.5, andz is 1, and(c) separating said magnesium phosphate product from said slurry.

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