Sulfur dioxide absorption and conversion to sulfur

Journal Article · Thu Sep 01 00:00:00 EDT 1977 · Ind. Eng. Chem., Prod. Res. Dev.; (United States)

DOI:https://doi.org/10.1021/i360063a002· OSTI ID:6892166

Rosenwald, R H; Urban, P; Smith, D B

UOP Inc. explains the chemistry involved in a flue-gas sulfur dioxide extraction method based on sodium carbonate-bicarbonate absorption and subsequent reduction to elemental sulfur. The absorption takes place at pH 6.2 in the presence of sodium bisulfide/polysulfide to convert the sulfite to sodium thiosulfate, the formation of which controls the oxidation of sulfite to sulfate, an undesirable by-product. The method reduces sodium thiosulfate with hydrogen sulfide, with or without the presence of carbon dioxide, to form elemental sulfur and a polysulfide solution; it then catalytically reduces the unreacted thiosulfate and the polysulfide sulfur with hydrogen-carbon monoxide to yield hydrogen sulfide, carbon dioxide, and a carbonate-bicarbonate solution for recycle as absorbent.

• OSTI ID: 6892166
• Journal Information: Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 16; ISSN IEPRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
02 PETROLEUM
020800 -- Petroleum-- Waste Management
03 NATURAL GAS
030700 -- Natural Gas-- Waste Management
ABSORPTION
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
ELEMENTS
FLUE GAS
GASEOUS WASTES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RECOVERY
REMOVAL
SULFUR
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES