Title: Reactive separation of CO₂ using pressure pelletised limestone

Authors: Himanshu Gupta, Mahesh V. Iyer, Bartev B. Sakadjian, Liang-Shih Fan

Addresses: Department of Chemical Engineering, 121 Koffolt Laboratories, The Ohio State University, 140 West 19th Avenue, Columbus, OH 43210, USA. ' Department of Chemical Engineering, 121 Koffolt Laboratories, The Ohio State University, 140 West 19th Avenue, Columbus, OH 43210, USA. ' Department of Chemical Engineering, 121 Koffolt Laboratories, The Ohio State University, 140 West 19th Avenue, Columbus, OH 43210, USA. ' Department of Chemical Engineering, 121 Koffolt Laboratories, The Ohio State University, 140 West 19th Avenue, Columbus, OH 43210, USA

Abstract: Calcium oxide powder derived by the calcination of mesoporous calcium carbonate provides a higher conversion towards carbonation compared to calcium oxide derived from naturally occurring limestone and hydrated lime. Compaction of this high reactivity sorbent was investigated for its use in CO₂ separation from flue gas. It was observed that compaction preserved the porosity of the powder. The pellets were able to attain 50–80% conversion towards carbonation over three cycles. The rate and extent of carbonation reaction reduces with increasing pellet thickness. The effect of compaction load and CO₂ concentration did not show any appreciable difference in the rate of carbonation. Whereas the mesoporous calcium carbonate pellet showed appreciable drop in carbonation conversion, the pellets made from other precursors, such as natural limestone and hydrated lime, maintained a higher degree of reactivity over three cycles.

Keywords: carbonation-calcination cycle; CO₂ separation; compaction; flue gas cleaning; high reactivity calcium oxide; precipitated calcium carbonate; pressure pelletisation of limestone; CO₂ sequestration.

DOI: 10.1504/IJETM.2004.004629

International Journal of Environmental Technology and Management, 2004 Vol.4 No.1/2, pp.3 - 20

Published online: 26 May 2004 *

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