Calcium Carbonate → Sodium Carbonate

HRID 1446797Notes

Reaction equation

[O-:1][W:2]([O-:5])(=[O:4])=[O:3].[Na+:6].[Na+].[C:8](=[O:11])([O-:10])[O-:9].[Ca+2:12]>>[C:8](=[O:9])([O-:11])[O-:10].[Na+:6].[Na+:6].[O-:4][W:2]([O-:5])(=[O:3])=[O:1].[Ca+2:12]

Participants

Reactant 2

HCID 10112Calcium Carbonate

HCID 26052Sodium tungstate

Product 2

HCID 10340Sodium Carbonate

HCID 1232647790-75-2

Procedure

reacting sodium tungstate in the liquor with calcium carbonate at a temperature of at least about 130° C. to form sodium carbonate and solid calcium tungstate, while providing sufficient carbon dioxide overpressure to the slurry to convert sodium carbonate in the slurry to sodium bicarbonate and thereby promote the conversion of sodium tungstate to calcium tungstate, thereby forming a product slurry containing a sodium bicarbonate liquor and a solid calcium tungstate concentrate which can be recovered from said product slurry and,

Workup

customof at least about 130° C.

Sources & evidence

ORD record: ord-b16c31bf762b4b27915cb7c6bd47b729
Source dataset: uspto-grants-1982_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04313914

Reaction notes

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