Reaction #56598

ord-f7a8ee6ec3c540da9c74e8fe333befd3

Reaction equation

[Mg]
magnesium
[Mg+2].[OH-].[OH-]
magnesium hydroxide
O=S=O
sulfur dioxide
[Mg+2].[OH-].[OH-]
magnesium hydroxide slurry
O=S=O
sulfur dioxide
→
O=S([O-])[O-].[Mg+2]
magnesium sulfite
O=S([O-])O.O=S([O-])O.[Mg+2]
magnesium bisulfite

Reactants

[Mg]
magnesium
[Mg+2].[OH-].[OH-]
magnesium hydroxide
O=S=O
sulfur dioxide
—
lime
[Mg+2].[OH-].[OH-]
magnesium hydroxide slurry
O=S=O
sulfur dioxide

Reagents

None

Conditions

Detailed conditions
See reaction.notes.procedure_details.

Workup

  1. 1
    workup.ADDITIONmay be treated
  2. 2
    workup.ADDITIONcontaining

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)

Source

DOI: 10.6084/m9.figshare.5104873.v1Patent: US07419643B1uspto-grants-2008_09