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Reactive precipitation in gas-slurry systems: The CO2Ca(OH)(2)-CaCO3 system

DSpace at IIT Bombay

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Field Value
 
Title Reactive precipitation in gas-slurry systems: The CO2Ca(OH)(2)-CaCO3 system
 
Creator KAKARANIYA, S
GUPTA, A
MEHRA, A
 
Subject chemical-reaction
aqueous slurries
sulfur-dioxide
fine particles
absorption
emulsions
 
Description The present work examines the chemical absorption of carbon dioxide (CO2) gas in aqueous calcium hydroxide (Ca(OH)(2)) slurries, which leads to the precipitation of calcium carbonate. Carbonation of the Ca(OH)(2) slurry is an important method for the industrial manufacture of precipitated calcium carbonate (PCC), wherein the hydroxide particles are gradually converted to carbonate. Experimental data have been generated by contacting CO2 with an aqueous Ca(OH)(2) suspension in a model gas-liquid, stirred contactor, under different operating conditions. It is not possible to distinguish between the different types of particles present in the system (hydroxide, carbonate, mixed particles) "visually". Therefore, the particle size distribution of all the particles present has been obtained using microscopy and optical image analysis techniques. The conversion of hydroxide-to-carbonate is determined by titration. A modeling approach that assumes that the hydroxide particles get converted by the diffusion of dissolved CO2 into its internal parts (as is observed in a "shrinking core" scenario), coupled with a population balance to describe the size distribution of the unreacted particle cores has been formulated. The experimental and theoretical conversions agree reasonably well.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T17:51:28Z
2011-12-26T12:49:06Z
2011-12-27T05:34:49Z
2011-07-14T17:51:28Z
2011-12-26T12:49:06Z
2011-12-27T05:34:49Z
2007
 
Type Article
 
Identifier INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 46(10), 3170-3179
0888-5885
http://dx.doi.org/10.1021/ie060732l
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4028
http://hdl.handle.net/10054/4028
 
Language en