Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1979-05-10
1982-02-02
Vertiz, O. R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423512A, C01B 1700
Patent
active
043139248
ABSTRACT:
An improved apparatus and process are disclosed for the removal of sulfur oxides such as sulfur dioxide from waste gas streams. The process comprises scrubbing the waste gas with a circulating aqueous sodium sulfite/sodium bisulfite absorption solution at a relatively low pH followed by subjecting a portion of the circulating absorption solution to an improved multi-stage regeneration procedure wherein lime is employed to regenerate sulfite from bisulfite. The bleed from the scrubbing step which is subjected to regneration has a low pH and hence can dissolve more lime thereby increasing the lime utilization efficiency. In the regeneration procedure, a lime slurry is separated into a slurry of coarser lime particles and a second portion which contains very fine lime particles. The main regeneration is accomplished by adding the coarse lime slurry to the scrubber bleed. Due to the low pH in this reaction, not all the bisulfite is regenerated to sulfite. However, any remaining bisulfite is regenerated to sulfite in later regeneration steps by reaction with the second portion of the lime slurry in order to precipitate as much calcium as possible in the form of sulfate.
REFERENCES:
patent: 3911084 (1975-10-01), Wall
Boynton, Chemistry and Technology of Lime and Limestone, 1966, p. 317.
Heller Gregory A.
Neptune AirPol, Inc.
Vertiz O. R.
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