Phosphoric 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].[P:22]([O-])([O-])([O-])=[O:23].P(=O)(O)(O)O>O>[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 3
Product 1
Reagents, catalysts & solvents 1
Procedure
Phosphate rock analyzing 68% bone phosphate of lime (tricalcium phosphate) was comminuted to a fineness such that 90% passed a 100-mesh screen. It was delivered to a pre-reactor having dimensions of 3'×6' at a rate of 200 lbs per ton of product using a weigh belt. Simultaneously water at a rate of 76 lb/ton and phosphoric acid (51.4% P2O5) at a rate of 266 lb/ton were also delivered to the prereactor. The phosphoric acid feed was selected to provide a total P2O5 :CaO ratio of 2.16 by weight (equivalent to a mole ratio of 0.85). The amount of water was selected to dilute the phosphoric acid to 40.0%. Anti-foam agent 0.08 lb/ton (Defoamer 2617-M made by Southern Sizing Corporation was used; it is described as an anionic fatty emulsion), was also delivered to the pre-reactor. The mixture was heated with agitation to a temperature of 175°-210° F. by steam injection. Silicon tetrafluoride and carbon dioxide vapors released by the reactants were vented to a scrubber. The rate of feed of ingredients to the pre-reactor and the size of the digester were selected to provide a retention time of 90 minutes for a production rate of 20 tons/hour.
Workup
- customIt was delivered to a pre-reactor
Sources & evidence
- ORD record
- ord-2a1fff02a2ae424e96ef978af63bc556
- Source dataset
- uspto-grants-1985_07
- Patent number
- US04528021
Reaction notes
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