Aqueous absorbents for stack-gas desulfurization by absorption/stripping. Final report
Several alternative aqueous absorbents were experimentally evaluated for use in absorption/stripping processes for flue gas desulfurization. The pH behavior of citrate, basic aluminum sulfate, ethylenediamine, and adipate buffers was measured and modeled. SO/sub 2/ vapor pressure was measured at 25 to 168/sup 0/C over solutions with sodium citrate, glyoxylic acid, and basic aluminum sulfate. Solution stability at 100 to 180/sup 0/C was studied with sodium citrate. The rate of SO/sub 2/ reaction with glyoxylic acid was deduced from measurements of the reverse reaction. Sodium citrate is not an attractive absorbent. With absorption of 3000 ppM SO/sub 2/ at 55/sup 0/C the actual steam requirements would be about 41 kg/kg SO/sub 2/. Disproportionation and other side-reactions in sodium citrate buffer can be avoided by operating below 130/sup 0/C. Glyoxylic acid is also an unattractive alternative because rate data indicate that liquid holdup requirements and mass transfer requirements in the absorber would be prohibitive. Basic aluminum sulfate may be attractive if used in absorption below 45/sup 0/C. Solubility of basic aluminum salts limits operation to a pH less than 3.5.
- Research Organization:
- Texas Univ., Austin (USA). Dept. of Chemical Engineering
- OSTI ID:
- 5957980
- Report Number(s):
- EPRI-CS-3185; ON: DE83902947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM SULFATES
SORPTIVE PROPERTIES
CITRIC ACID
FLUE GAS
DESULFURIZATION
GLYOXYLIC ACID
SULFUR DIOXIDE
ABSORPTION
VAPOR PRESSURE
ADIPIC ACID
CHEMICAL REACTION KINETICS
EQUILIBRIUM
EXPERIMENTAL DATA
FOSSIL-FUEL POWER PLANTS
LIQUIDS
PH VALUE
SCRUBBERS
TEMPERATURE DEPENDENCE
VAPORS
ALDEHYDES
ALUMINIUM COMPOUNDS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DICARBOXYLIC ACIDS
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HYDROXY ACIDS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
REACTION KINETICS
SULFATES
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMODYNAMIC PROPERTIES
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions