High Temperature Recovery of CO2 from Flue Gases Using Hydrotalcite Adsorbent

doi:10.1205/095758201531130

Process Safety and Environmental Protection

Volume 79, Issue 1, January 2001, Pages 45-51

https://doi.org/10.1205/095758201531130 Get rights and content

Experimental and theoretical studies on the high temperature recovery of CO₂ from flue gases are presented. The work employs a potassium promoted hydrotalcite adsorbent, for which CO₂ capacities in excess 0.8 mol kg⁻¹ were measured at temperatures of 481 K and 575 K and in the presence of high concentrations (∼30% (v/v)) of water. Elution profiles from a bench-scale adsorption unit also enabled analysis of adsorption and desorption kinetics. A cyclic and multibed process for the continuous and energy efficient recovery of CO₂ is proposed. The process involves an integrated energy recovery step for the generation of steam, which is then used for the recovery of CO₂ from the adsorbed phase. A mathematical model for the CO₂-hydrotalcite system, based on measured equilibria and kinetic data, is used for the preliminary assessment of the process, e.g. in terms of CO₂ product purity and steam consumption. Particular attention is given to CO₂ recovery from the stack gas of a typical 10 MW coal-fired power plant. The work has application to existing industrial processes in which recovered CO₂ (at elevated temperatures) can be used as a feedstock for further catalytic processing, such as dry methane reforming and carbon gasification.

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High Temperature Recovery of CO2 from Flue Gases Using Hydrotalcite Adsorbent

Chem EngSci

Chem Eng Sci

Chem Eng Sci

Chem Eng Sci

Comput Chem Eng

Adsorption of carbon dioxide onto hydrophobic zeolite under high moisture

J Chem Eng Japan

Recovery of carbon dioxide from stack gas by piston-driven ultra-rapid PSA

J Chem Eng Japan

High Temperature Recovery of CO₂ from Flue Gases Using Hydrotalcite Adsorbent