Process for separating sulfur oxides from gas streams

Patent · Tue Oct 07 04:00:00 EDT 1975

OSTI ID:7328098

Wall, B I; Harris, H C; Arnaud, J L

Sulfur oxides, particularly sulfur dioxide, present in waste gas streams are separated therefrom by contacting the sulfur oxides with a sodium sulfite--sodium bisulfite extraction liquor having a pH of at least 6, regenerating a portion of the sulfur oxides-containing extraction liquor by adding calcium hydroxide thereto to raise the pH of the liquor to about 8 to 10, removing a calcium sulfite precipitate from the regenerated extraction liquor, and mixing the solids-free regenerated extraction liquor with the sulfur oxides-containing extraction liquor to maintain its pH of at least 6. 13 claims, 2 figures.

• Assignee: FMC Corp.
• Patent Number(s): US 3911084
• OSTI ID: 7328098
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DESULFURIZATION
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
REMOVAL
SEPARATION PROCESSES
SORPTION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES