Calcium Carbonate → Carbon Dioxide

HRID 2068456Notes

Reaction equation

[OH-:1].[Ca+2:2].[OH-].[C:4](=[O:7])([O-:6])[O-:5].[Ca+2]>>[C:4](=[O:5])([O-:7])[O-:6].[Ca+2:2].[O-2:1].[Ca+2:2].[C:4](=[O:6])=[O:5]

Participants

Reactant 2

HCID 10112Calcium Carbonate

HCID 6093208Calcium Hydroxide

Product 3

HCID 280Carbon Dioxide

HCID 10112Calcium Carbonate

HCID 6850728Calciumoxide

Procedure

FIG. 2 depicts a process in which calcium hydroxide is used to adjust the pH of the pretreated feedstock. Like reference numbers indicate identical or similar processing steps as in FIG. 1A. FIG. 2 is similar to FIG. 1A, except that, according to this embodiment, the calcium carbonate-containing stream 24 is subjected to calcination in a lime kiln 25. Calcination of calcium carbonate in lime kiln 25 produces calcium oxide and carbon dioxide. The calcium oxide becomes hydrated by the addition of water to form an aqueous solution of calcium hydroxide 29. The resulting calcium hydroxide-containing stream 29 is then the stream used for the neutralization 6. If the calcium carbonate-containing stream 24 additionally contains magnesium carbonate, stream 29 will contain magnesium hydroxide.

Sources & evidence

ORD record: ord-5f007c60f9d149ce9056a7bfb6f73e86
Source dataset: uspto-grants-2012_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08298796B2

Reaction notes

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