Ammonia → Phosphorus oxide (P4O10)

Reaction equation

[O-:1][P:2]([O-:5])([O-:4])=[O:3].[O-][P:7]([O-:10])([O-:9])=[O:8].[O-][P:12]([O-:15])([O-])=[O:13].[F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[P:22](=O)(O)(O)[OH:23].S(=O)(=O)(O)O.N>>[O:3]=[P:2]12[O:5][P:7]3([O:10][P:12]([O:15][P:22]([O:9]3)([O:4]1)=[O:23])(=[O:13])[O:1]2)=[O:8]

Participants

Reactant 4

HCID 222Ammonia

HCID 1004Phosphoric Acid

HCID 1118Sulfuric Acid

HCID 10207414Fluorapatite (Ca5F(PO4)3)

Product 1

HCID 14812Phosphorus oxide (P4O10)

Procedure

In 1970, Richmond et al ('641 supra) reacted phosphate rock with phosphoric acid and then with sulfuric acid. The resulting acidulate was subsequently neutralized with anhydrous ammonia to produce a 7-21-0 (N--P2O5 --K2O) grade slurrey fertilizer. In later investigations Pottgiesser et al ('162 supra) produced a 13.5-6-0 (N--P2O5K2O) grade slurry by reacting nitric acid with phosphate rock and subsequently feeding the resulting slurry into a body of preneutralized solution maintained at pH 7-10 by addition thereto of aqua ammonia.