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Kinetics and Structural Characterization of Calcium-Based Sorbents Calcined under Subatmospheric Conditions for the High-Temperature CO2Capture Process.
- Source :
-
Industrial & Engineering Chemistry Research . Jan2007, Vol. 46 Issue 1, p35-42. 8p. - Publication Year :
- 2007
-
Abstract
- The influence of several process parameters on the calcination of a naturally occurring limestone and a precipitated mesoporous calcium carbonate (CaCO3) sorbent structure to calcium oxide (CaO) is detailed in this study. CaCO3calcination is an integral part of a multicyclic carbonation-calcination reaction (CCR) process that separates carbon dioxide (CO2) from high-temperature gas mixtures into a pure CO2stream. Maintenance of high sorbent reactivity over repeated CCR cycles reduces the capital and operating cost of the CCR process. A lower calcination temperature, required to maintain high sorbent reactivity, reduces the calcination rate of CaCO3. This study investigates various process conditions such as subatmospheric calcination, sorbent dispersion in a rotary calciner, use of a high thermal conductivity sweep gas, etc. in enhancing the calcination rate at lower calcination temperatures. The high-temperature gas-solid carbonation studies of the resulting CaO sorbent prove the necessity to maintain a high porosity structure during limestone calcination. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LIMESTONE
*CALCIUM carbonate
*LIME (Minerals)
*CARBON dioxide
Subjects
Details
- Language :
- English
- ISSN :
- 08885885
- Volume :
- 46
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Industrial & Engineering Chemistry Research
- Publication Type :
- Academic Journal
- Accession number :
- 23618803
- Full Text :
- https://doi.org/10.1021/ie060214a