Process for regenerating scrubbing solutions

Details Process for regenerating scrubbing solutions Process for regenerating scrubbing solutions

1981-09-21

1983-04-05

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423512A, 423519, C01B 1700

Patent

active

043791301

ABSTRACT:
A method of regenerating a scrubbing solution containing sodium sulfite, sodium bisulfite, sodium sulfate and sometimes sodium hydroxide circulated in scrubbers to remove sulfur oxides from gas streams where sodium sulfite is converted to sodium bisulfite as sulfur dioxide is absorbed in the scrubbing solution. A portion of the circulating scrubbing solution is bled off for regeneration and reacted with calcium oxide in pebble lime while the pebble lime is impinged against an impingement surface at a velocity of at least 8-10 feet per second to convert the sodium bisulfite back to sodium sulfite and form calcium sulfite precipitate. The calcium sulfite is removed from the regenerated scrubbing solution and the regenerated scrubbing solution returned to the circulating scrubbing solution in the scrubbers.

REFERENCES:
patent: 3708266 (1973-01-01), Gustavsson
patent: 3989797 (1976-11-01), Brady et al.
Boynton, Chemistry and Technology of Lime and Limestone 1966, p. 167.

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