Process for preparing monobasic pyrophosphate materials
AssigneeInnophos, Inc.
InventorsAngela Newbern, Robert Clyde Finn
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing a material having the formula: (MxHy)+4(P207)−4: where M is a cation selected from the group consisting of monovalent cations, divalent cations, and trivalent cations; H is hydrogen, P2O7 is the pyrophosphate anion, and y is a number between 2.2 and 3.8; and x is a value sufficient to balance the overall charge of said compound comprising mixing and heating 105-112% polyphosphoric acid or pyrophosphoric and a compound having a monovalent metal cation or a compound having a divalent metal cation or a compound having a trivalent metal cation.
Claims2
A process for preparing a material having the formula:
- (MxHy)+4(P207)−4:
- where M is a cation selected from the group consisting of monovalent cations, divalent cations, and trivalent cations;
- H is hydrogen, P2O7 is the pyrophosphate anion, and y is a number between 2.2 and 3.8;
- and x is a value sufficient to balance the overall charge of said compound comprising the steps of:
- a. mixing equal parts on a mole basis of 105-112% polyphosphoric acid and a compound having a monovalent metal cation or a divalent metal cation or a trivalent metal cation;
- b. heating the mixture prepared in step a.;
- c. mixing the heated step b. mixture.
A process for preparing a material having the formula:
- (MxHy)+4(P207)−4:
- where M is a cation selected from the group consisting of monovalent cations, divalent cations, and trivalent cations;
- H is hydrogen, P2O7 is the pyrophosphate anion, and y is a number between 2.2 and 3.8, and wherein further if M is a monovalent cation, then x=4−y;
- further provided if M is a divalent cation, then x=(4−y)/2;
- wherein further if M is a trivalent cation, then x=(4−y)/3 comprising the steps of:
- a. mixing equal parts on a mole basis of 105-112% polyphosphoric acid and a compound having a monovalent metal cation or a compound having a divalent metal cation or a compound having a trivalent metal cation;
- b. heating the mixture prepared in step a.;
- c. mixing the heated step b. mixture.
Dependencies are inferred from the claim text.