Removal of sulfur dioxide from gas streams

Patent · Tue Sep 03 04:00:00 EDT 1974

OSTI ID:7238735

Villiers-Fisher, J F

Sulfur dioxide is removed from a gas stream which initially contains sulfur dioxide and sulfur trioxide, by initially contacting the gas stream with discrete porous solid particles of an inorganic alkali which may be in equilibrium with respect to sulfur dioxide absorption and which could be primarily alkali sulfite during much of its effective life. The sulfur trioxide component of the gas stream reacts with the inorganic alkali solid, generally displacing any previously absorbed sulfur dioxide, and a second gas stream is produced which is substantially devoid of sulfur trioxide. The second gas stream is scrubbed with a liquid containing an active alkaline component for the absorption of sulfur dioxide, and a final gas stream free of sulfur oxides is produced. The invention prevents the absorption of sulfur trioxide by the scrubbing liquid and thus greatly reduces the buildup of sulfates in the scrubbing liquid, which are difficult to regenerate. Thus, a net loss of active alkaline component due to sulfate formation is prevented.

• Assignee: Chemical Construction Corp.
• Patent Number(s): US 3833711
• OSTI ID: 7238735
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
GASEOUS WASTES
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
REMOVAL
SORPTIVE PROPERTIES
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
SURFACE PROPERTIES
WASTES