The kinetics of sulfation of calcium oxide. [Quarterly] report No. 3, September 1, 1989--November 30, 1989

Technical Report · Fri Dec 29 04:00:00 EST 1989

DOI:https://doi.org/10.2172/10167587· OSTI ID:10167587

Sarofim, A F; Longwell, J P

Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change. As pore diffusion was a limiting phenomenon in most of the experiments, authors have used several pore models to described this complication, more or less successfully. Product layer diffusivity has been assumed to be constant as conversion increased; however, there is no general agreement as to its value. In this work we are investigating the mechanism of this process with emphasis on measurement of product layer diffusivity and the surface reaction rate. Some additional experimental work was done to investigate the order and activation energy of the sulfation under different conditions. The effect of additives was studied again, by sprinkling some KCl or NaCl salt on top of partially reacted synthetic lime, in an effort to change the surface reaction rate rather than the diffusion rate.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89754
• OSTI ID: 10167587
• Report Number(s): DOE/PC/89754--T4; ON: DE92018753
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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20 FOSSIL-FUELED POWER PLANTS
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
54 ENVIRONMENTAL SCIENCES
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ACTIVATION ENERGY
AIR POLLUTION CONTROL
CALCIUM OXIDES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICALS MONITORING AND TRANSPORT
DIFFUSION
LAYERS
NOXIOUS GAS AND PARTICULATE EMISSIONS
POROSITY
POTASSIUM CHLORIDES
PROGRESS REPORT
SODIUM CHLORIDES
SORPTIVE PROPERTIES
SULFATION
SULFUR DIOXIDE
SURFACE AREA
WASTE MANAGEMENT