Application of the carbon dioxide-barium hydroxide hydrate gas-solid reaction for the treatment of dilute carbon dioxide-bearing gas streams
The removal of trace components from gas streams via irreversible gas-solid reactions in an area of interest to the chemical engineering profession. This research effort addresses the use of fixed beds of Ba(OH)/sub 2/ hydrate flakes for the removal of an acid gas, CO/sub 2/, from air that contains approx. 330 ppM/sub v/ CO/sub 2/. Areas of investigation encompassed: (1) an extensive literature review of Ba(OH)/sub 2/ hydrate chemistry, (2) microscale studies on 0.150-g samples to develop a better understanding of the reaction, (3) process studies at the macroscale level with 10.2-cm-ID fixed-bed reactors, and (4) the development of a model for predicting fixed-bed performance. Experimental studies indicated fixed beds of commercial Ba(OH)/sub 2/.8H/sub 2/O flakes at ambient temperatures to be capable of high CO/sub 2/-removal efficiencies (effluent concentrations <100 ppB), high reactant utilization (>99%), and an acceptable pressure drop (1.8 kPa/m at a superficial gas velocity of 13 cm/s). Ba(OH)/sub 2/.8H/sub 2/O was determined to be more reactive toward CO/sub 2/ than either Ba(OH)/sub 2/.3H/sub 2/O or Ba(OH)/sub 2/.1H/sub 2/O. A key variable in the development of this fixed-bed process was relative humidity. Operation at conditions with effluent relative humidities >60% resulted in significant recrystallization and restructuring of the flake and subsequent pressure-drop problems.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5625798
- Report Number(s):
- ORNL-5887; ON: DE84000039
- Country of Publication:
- United States
- Language:
- English
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ADSORPTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM CARBONATES
BARIUM COMPOUNDS
BARIUM HYDROXIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 14
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON ISOTOPES
CARBON OXIDES
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
DIAGRAMS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLUIDS
GASEOUS WASTES
GASES
HYDRATES
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
ISOTHERM
ISOTOPES
LIGHT NUCLEI
MANAGEMENT
MASS TRANSFER
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PACKED BED
PHASE DIAGRAMS
PHYSICAL PROPERTIES
PROCESSING
RADIOACTIVE WASTE PROCESSING
RADIOISOTOPES
SOLIDS
SOLUBILITY
SORPTION
SPECIFICATIONS
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
YEARS LIVING RADIOISOTOPES