Calcination of calcium hydroxide sorbent in the presence of SO sub 2 and its effect on reactivity. Report for October 1988-March 1989

Technical Report · Thu Apr 06 04:00:00 EDT 1989

OSTI ID:5568955

Jozewicz, W; Kirchgessner, D A

The paper discusses the calcination of Ca(OH){sub 2} sorbent in the presence of SO{sub 2} and its effect on reactivity. When Ca(OH){sub 2} is calcined in an isothermal flow reactor with 300 ppm or less SO{sub 2}, the structure of the sorbent is characterized by retention of higher pore volumes and surface areas than when calcined in the absence of SO{sub 2}. When reinjected into the isothermal flow reactor (1000 C, 3000 ppm, 0.8 s), a higher level of reactivity with SO{sub 2} is observed for the SO{sub 2}-modified calcine than for the unmodified sorbent. Structural evidence suggests that a slower initial rate of sintering in the modified calcine accounts for its enhanced reactivity. It is postulated that deposition of small amounts of CaSO4 on pore faces and along crystal boundaries retards the solid state diffusion process responsible for sintering. The effects on sintering and reactivity of various combinations of residence time (0.6 - 2.0 s) and SO{sub 2} concentration (10 - 50 ppm) during precalcination have been tested.

• Research Organization: Acurex Corp., Research Triangle Park, NC (USA)
• OSTI ID: 5568955
• Report Number(s): PB-89-221345/XAB
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM SULFATES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
CONTROL
DECOMPOSITION
DESIGN
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POROSITY
PYROLYSIS
REACTION KINETICS
SORPTIVE PROPERTIES
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES