Ammonia scavenger
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
A process for making particulate substantially water-insoluble magnesium phosphate product and method of use of the product for removing ammonia from aqueous solutions. The particulate magnesium phosphate product acts as a remarkably effective scavenger wherein under equilibrium conditions only about six (6) grams of the product are required to bind the ammonia (more exactly, ammonium ions) liberated from one (1) gram of the urea, a result far superior to traditional zirconium phosphate (ZP) prior art materials which under ideal conditions require about 17 to 20 grams of ZP per gram of urea. The particulate magnesium phosphate product can also be used for the removal of ammonium ions either produced by enzymatic or non-enzymatic hydrolysis of urea or proteins or amino acids or available as NH4+ from its native source. The magnesium phosphate product is made by forming a slurry of water and magnesium hydroxide in the presence of a phosphate ion-containing buffer having a pH of about 6.5 to about 8.5 and reacting the slurry with H3 PO4.
206 Citations
18 Claims
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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.zwherein x is from about 0.75 to about 1.4, y is from about 0.2 to about 1.5, and z is 1 comprising 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.zwherein x is from about 0.75 to about 1.4, y is from about 0.2 to about 1.5, and z is 1, and (c) separating said magnesium phosphate product from said slurry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for the preparation of a particulate substantially water-insoluble magnesium phosphate product containing slurry having a pH of from about 6.5 to about 8.5, said product 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.zwherein x is from about 0.75 to about 1.4, y is from about 0.2 to about 1.5, and z is 1, comprising the steps of; (a) mixing magnesium hydroxide with water containing a phosphate ion-containing buffer having a pH of from about 6.5 to about 8.5 to form a slurry, and (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.zwherein x is from about 0.75 to about 1.4, y is from about 0.2 to about 1.5, and z is 1. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification