Regenerative sulfur dioxide scrubbing system

Patent · Tue Feb 15 04:00:00 EST 1977

OSTI ID:7119518

Gorin, E

An aqueous regenerative SO/sub 2/ scrubbing system is provided which has a scrubbing loop and a regeneration loop. The scrubbing loop contains a scrubber through which a thiosulfate-rich aqueous solution containing an alkali metal carbonate continuously circulates under sulfite-forming conditions. The sulfite in the spent absorbent solution is converted to thiosulfate in a sulfite conversion zone located in the scrubbing loop but outside the scrubber. The sulfite conversion is effected by means of a reducing agent containing a water soluble alkali metal hydrosulfide as the essentail sulfite reducing agent. The regeneration loop serves to convert the incremental portion of thiosulfate formed in the scrubbing loop to H/sub 2/S and an aqueous solution containing the required amounts of alkali metal carbonate and of alkali metal hydrosulfide for the scrubbing loop. By means of a two-step process in the regenerator, the proper ratio of alkali metal hydrosulfide to carbonate for maintaining the system in the correct internal balance of reagents is established, whereby stable continuous operation of the entire system is achieved.

• Assignee: Continental Oil Co.
• Patent Number(s): US 4008310
• OSTI ID: 7119518
• 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
ALKALI METALS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DESIGN
DESULFURIZATION
ELEMENTS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
METALS
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REMOVAL
SCRUBBERS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES