Method for removing sulfur oxide from waste gases and recovering

Details Method for removing sulfur oxide from waste gases and recovering Method for removing sulfur oxide from waste gases and recovering

1975-12-08

1977-08-09

Satterfield, Walter R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

75 72, 4232105, 423570, 423576, B01D 4700, C01B 1702

Patent

active

040411427

ABSTRACT:
A continuous catalytic fused salt extraction process is described for removing sulfur oxides from gaseous streams. The gaseous stream is contacted with a molten potassium sulfate salt mixture having a dissolved catalyst to oxidize sulfur dioxide to sulfur trioxide and molten potassium normal sulfate to solvate the sulfur trioxide to remove the sulfur trioxide from the gaseous stream. A portion of the sulfur trioxide loaded salt mixture is then dissociated to produce sulfur trioxide gas and thereby regenerate potassium normal sulfate. The evolved sulfur trioxide is reacted with hydrogen sulfide as in a Claus reactor to produce elemental sulfur. The process may be advantageously used to clean waste stack gas from industrial plants, such as copper smelters, where a supply of hydrogen sulfide is readily available.

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