Magnesium Hydroxide → Sodium Carbonate

HRID 1689565Notes

Reaction equation

[OH-].[Mg+2:2].[OH-].[C:4](=[O:7])([OH:6])[O-:5].[Na+:8]>>[C:4](=[O:5])([O-:7])[O-:6].[Mg+2:2].[C:4](=[O:5])([O-:7])[O-:6].[Na+:8].[Na+:8]

Participants

Reactant 2

HCID 73981Magnesium Hydroxide

HCID 516892Sodium Bicarbonate

Product 2

HCID 10340Sodium Carbonate

HCID 11029Magnesium Carbonate

Procedure

In one embodiment, the invention relates to a process of producing magnesium metal in which the sodium hydroxide used as a reactant in an initial step of the process is recovered in a later step of the process and recycled. For example, steps 5-7 in FIGS. 1-4 illustrate this use and recovery of sodium hydroxide. The process comprises: (a) reacting a magnesium silicate with sodium hydroxide to produce magnesium hydroxide; (b) reacting the magnesium hydroxide with sodium bicarbonate to produce magnesium carbonate and sodium carbonate; (c) reacting the magnesium carbonate in one or more reactions to produce magnesium metal; (d) reacting the sodium carbonate with a metal hydroxide to produce sodium hydroxide; and (e) recycling the sodium hydroxide from step (d) into step (a). In one embodiment the metal hydroxide of step (d) is calcium hydroxide.

Sources & evidence

ORD record: ord-5d8ff55dd4604c0e9e35de0230103513
Source dataset: uspto-grants-2012_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08152895B2

Reaction notes

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