Calcium Carbonate → Calcium

HRID 2420621Notes

Reaction equation

[P].[Ca:2].C(=O)([O-])[O-].[Ca+2].C([O-])(=O)[CH2:9][C:10](CC([O-])=O)([C:12]([O-:14])=[O:13])[OH:11].[Ca+2].C([O-])(=O)[CH2:23][C:24](CC([O-])=O)([C:26]([O-:28])=[O:27])[OH:25].[Ca+2].[Ca+2]>>[Ca:2].[C:12]([O-:14])(=[O:13])[CH:10]([CH3:9])[OH:11].[Ca+2:2].[C:26]([O-:28])(=[O:27])[CH:24]([CH3:23])[OH:25]

Participants

Reactant 4

HCID 10112Calcium Carbonate

HCID 13136Tricalcium Citrate

HCID 5460341Calcium2×

HCID 5462309Phosphorus

Product 2

HCID 13144Calcium Lactate

HCID 5460341CalciumYield 21%

Procedure

Eggshell powder is used in the food industry, including animal and human nutritional supplements. Eggshells provide approximately 36-37 percent elemental calcium in addition to traces of phosphorous and other trace elements. Thus, for example, 500 mg of dried powdered eggshell provides approximately 180 mg elemental calcium. This compared vary favorably to other calcium salts. For example, calcium carbonate provides 40 percent elemental calcium, calcium citrate provides 21 percent elemental calcium, calcium lactate provides 13 percent elemental calcium, calcium gluconate provides 9 percent elemental calcium, dicalcium phosphate provides 23 percent elemental calcium (and 19 percent phosphorus), and bone meal provides 20 percent elemental calcium (and 17 percent phosphorus). A single large eggshell has a mass of approximately 6 g and provides approximately 2200 mg of calcium.

Sources & evidence

ORD record: ord-6e5a8f4098de46cb82302e6d8dc804f5
Source dataset: uspto-grants-2011_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07954733B2

Reaction notes

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