Sulfur Dioxide → Magnesium sulfite

HRID 28320

Reaction equation

HRID 28320 reaction equation
[S:1](=[O:3])=[O:2].[Mg:4].[OH-:5].[OH-].[Mg+2]>>[S:1]([O-:5])([O-:3])=[O:2].[Mg+2:4].[S:1](=[O:5])([OH:3])[O-:2].[Mg+2:4].[S:1](=[O:5])([OH:3])[O-:2]

Participants

5

Reactant 3

HCID 1119Sulfur Dioxide2×HCID 73981Magnesium Hydroxide2×HCID 5462224Magnesium

Product 2

HCID 3014583Magnesium sulfiteHCID 10130272Magnesium bisulfite

Procedure

In lieu of a limestone or lime-based scrubbing system, flue gas containing sulfur dioxide may be treated by passing it through a scrubbing unit that utilizes a magnesium-containing scrubbing agent, e.g., a magnesium hydroxide slurry. The magnesium hydroxide reacts with sulfur dioxide to produce magnesium sulfite and magnesium bisulfite. The magnesium hydroxide slurry also reacts with hydrochloric acid in the flue gas, producing magnesium chloride, although there is very little hydrochloric acid in the flue gas compared to sulfur dioxide. The following chemical reactions occur in the scrubbing unit: SO2+Mg(OH)2→MgSO3+H2O  (1) H2O+SO2+MgSO3→Mg(HSO3)2  (2) Mg(HSO3)2+Mg(OH)2→2MgSO3  (3) 2HCl+Mg(OH)2→MgCl2+2H2O  (4)

Workup

  1. additionmay be treated
  2. additioncontaining

Sources & evidence

ORD record
ord-f7a8ee6ec3c540da9c74e8fe333befd3
Source dataset
uspto-grants-2008_09
Patent number
US07419643B1

Linked notes

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