Sodium Hydroxide → Phosphoric Acid

HRID 2119265Notes

Reaction equation

HRID 2119265 reaction equation
P12P3P1P23.[OH-].[Na+:6].[PH2:7]([O-:9])=[O:8].[Na+].[P:11]([O-:14])([O-:13])[O-:12].[Na+].[Na+].[Na+].P.[H][H].P.[H][H]>O>[PH2:7]([O-:9])=[O:8].[Na+:6].[P:11](=[O:8])([OH:14])([OH:13])[OH:12]

Participants

10

Reactant 7

HCID 14798Sodium HydroxideHCID 24404PhosphineHCID 123286TetraphosphorusHCID 134681phosphorous acid, trisodium saltHCID 178418361HCID 178418361, compoundHCID 178527019HCID 178527019, compoundHCID 178527700HCID 178527700, compound

Product 2

HCID 1004Phosphoric AcidHCID 178527019HCID 178527019, compound

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

Sodium hypophosphite is prepared by reacting tetraphosphorus, P4, with an aqueous solution of sodium hydroxide. This reaction produces a solution of about 50 wt % sodium hypophosphite, about 25 wt % sodium phosphite, and about 25 wt % of a gaseous mixture of phosphine and hydrogen in a 1:1 molar ratio. (Other alkali metal or alkaline earth metal hypophosphites can be made in the same manner.) At the present time, the practice is to burn the phosphine-hydrogen mixture in air followed by scrubbing in water to produce phosphoric acid. However, the resulting phosphoric acid has about the same value as the P4 starting material, so no value is added by these additional steps.

Workup

  1. customThis reaction produces

Sources & evidence

ORD record
ord-ce560263558f45589ad86b8da4a49fbb
Source dataset
uspto-grants-2004_02
Patent number
US06685904B1

Reaction notes

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