Phosphoric Acid → Calcium biphosphate

HRID 1845733Notes

Reaction equation

[P:1](=[O:5])([OH:4])([OH:3])[OH:2].[OH-].[Ca+2:7].[OH-]>>[P:1]([O-:5])([OH:4])([OH:3])=[O:2].[Ca+2:7].[P:1]([O-:5])([OH:4])([OH:3])=[O:2]

Participants

Reactant 2

HCID 1004Phosphoric Acid

HCID 6093208Calcium Hydroxide

Product 1

HCID 24454Calcium biphosphate

Procedure

According to an advantageous embodiment of the invention, the method comprises a mixing of phosphoric acid with an aqueous suspension of calcium hydroxide, a formation of a first precipitate of calcium monohydrogenphosphate (DCP), a separation between the first precipitate and an aqueous solution of calcium dihydrogenphosphate (MCP), an addition to this aqueous solution of a strong base and a separation between a second precipitate and a clear solution of calcium dihydrogenphosphate (MCP), forming the said mineral additive.

Workup

customa formation of a first precipitate of calcium monohydrogenphosphate (DCP), a separation between the first precipitate
additionan aqueous solution of calcium dihydrogenphosphate (MCP), an addition to this aqueous solution of a strong base
customa separation between a second precipitate

Sources & evidence

ORD record: ord-178e31fb9dd54618b2d4f7fab38f22b9
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08951587B2

Reaction notes

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