Patent ID: 7767851

Claim:
A solid form of ferric citrate having a formula of C 6 H 5 O 7 Fe and an intrinsic dissolution rate between 1.9 and 4.0 mg/cm 2 /min, as determined by the USP intrinsic dissolution assay in water, wherein the solid form of ferric citrate is synthesized by a method comprising: (a) adding an alkaline metal hydroxide solution to a ferric chloride solution; (b) isolating a ferric hydroxide precipitate; (c) forming a suspension of the ferric hydroxide precipitate in water; (d) adding citric acid to the suspension and forming a ferric-citric acid solution by heating said suspension with said citric acid; and (e) precipitating the solid form of ferric citrate by mixing the ferric-citric acid solution with an organic solvent.