Hydrochloric Acid → 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].Cl.[P:23](=O)(O)(O)[OH:24]>>[O:3]=[P:2]12[O:5][P:7]3([O:10][P:12]([O:15][P:23]([O:9]3)([O:4]1)=[O:24])(=[O:13])[O:1]2)=[O:8]Participants
Procedure
In the same manner as in Ex. 1-3, phosphate rock from Zin, Israel of the same analysis and particle size as before was heated at various temperatures and for various times. The treated rock was reacted with hydrochloric acid as before and in separate experiment with a sulphuric/phosphoric acid mixture and the colour of the liquid noted and organic and P2O5 content of the liquid obtained. The sulphuric/phosphoric acid was a mixture of 200 g of 20% P2O5 thermal phosphoric acid and enough 56% sulphuric acid to combine with 98% of the calcium content of the phosphate rock used, the amount of which was such as to contain 40 g P2O5. The specified amount of rock was mixed with stirring with 200 g of phosphoric acid at 60° C. When foaming ceased the sulphuric acid was added and the mixture stirred for 2 hrs at 70° C. to give a suspension of gypsum in phosphoric acid. The suspension was filtered hot and the filter cake washed three times with 50 cc cold tap water. All the filtrates were combined to give the product acid which was analysed for P2O5, total carbon and oxidizable carbon contents. The rock before and after the heating was also analysed for F. The results were as follows. (see Table 2). The Zin rock before heat treatment contained acid insoluble iron sulphide in amount of 250 ppm (expressed as S).
Sources & evidence
- ORD record
- ord-1e55cf084966456399d2071b2f4193a7
- Source dataset
- uspto-grants-1982_04
- Patent number
- US04325928
Reaction notes
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