Ammonia → Struvite ((NH4)Mg(PO4).6H2O)

HRID 1634533Notes

Reaction equation

HRID 1634533 reaction equation
[OH-:1].[Mg+2:2].[OH-].[NH3:4].[P:5](=[O:9])([OH:8])([OH:7])[OH:6]>>[OH2:6].[OH2:1].[OH2:6].[OH2:6].[OH2:6].[OH2:6].[P:5]([O-:9])([O-:8])([O-:7])=[O:6].[NH4+:4].[Mg+2:2]

Participants

4

Reactant 3

HCID 222Ammonia2×HCID 1004Phosphoric AcidHCID 73981Magnesium Hydroxide

Product 1

HCID 10220511Struvite ((NH4)Mg(PO4).6H2O)

Procedure

Thus, the overall process for producing the present inventive magnesium ammonium phosphate monohydrate slurry may be summarized as follows: (a) obtaining a magnesium hydroxide slurry having magnesium hydroxide particles wherein at least about 55 wt. % of the particles have a size less than about 2 microns; (b) then adding ammonia; (c) while maintaining an excess of ammonia and cooling, adding phosphoric acid at a rate so as not to exceed a temperature of about 110° F.; (d) producing a magnesium ammonium phosphate hexahydrate slurry; (e) heating the magnesium ammonium phosphate hexahydrate slurry to its boiling point.

Workup

  1. temperaturecooling
  2. customa temperature of about 110° F.

Sources & evidence

ORD record
ord-fc1aa92dc48d4a22bca73356a7f24d6e
Source dataset
uspto-grants-2003_01
Patent number
US06506805B2

Reaction notes

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