Removal of sulfur oxides from gas streams with ammonium sulfite

Patent · Tue May 20 04:00:00 EDT 1986

OSTI ID:5625287

Spitz, A W

A process is described for removal of sulfur oxides from sulfur oxide containing flue gases comprising scrubbing the flue gases in the first stage scrubber with an ammonium sulfite solution to remove most of the sulfur oxides and producing a liquor comprising ammonium sulfite, bisulfite and sulfate salts; recycling the liquor in the first state scrubber and producing a 40% to 50% solution of dissolved ammonium sulfite, bisulfite and sulfate salts in a first stage reservoir while maintaining the pH between about 5 and 5.8; maintaining the ratio of bisulfite to sulfite between approximately 2.3 to 1 and 1 to 1 without liberating ammonia; removing portions of the 40% to 50% solution of dissolved salts from the first stage reservoir; scrubbing the flue gases in a second stage scrubber with an ammonium sulfite solution of pH between 6.2 and 6.8 to remove additional sulfur oxides and producing a dilute liquor of 1% to 10% solids comprising ammonium sulfite, bisulfite and sulfate salts in a second stage reservoir; and pumping the dilute liquor from the second stage reservoir to the first stage reservoir in amounts sufficient to replace the removed portions.

• Assignee: Milpat Corp., Glenside, PA
• Patent Number(s): US 4590048
• OSTI ID: 5625287
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
AMMONIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
EQUIPMENT
EXTRACTION
FLUE GAS
GASEOUS WASTES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
QUANTITY RATIO
RECYCLING
REMOVAL
SCRUBBERS
SCRUBBING
SEPARATION PROCESSES
SOLVENT EXTRACTION
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES