Sulfur Dioxide → Magnesium sulfite

HRID 349140

Reaction equation

HRID 349140 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-5d444098fac94d62b14b1dbb5e096d5c
Source dataset
uspto-grants-2007_02
Patent number
US07179438B2

Linked notes

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