Sorption of carbon dioxide by ionic liquid-based sorbents

Asia-Pacific Journal of Chemical Engineering, Volume 7, Issue 1, pages 86–92, January/February 2012

Sorption of carbon dioxide by ionic liquid-based sorbents

Wentao Bi 1, Tao Zhu 1, Dong Wha Park 1,2, Kyung Ho Row 1

rowkho@inha.ac.kr

1 Department of Chemical Engineering, Inha University, 253 Yonghyun-Dong, Nam-Ku, Incheon 402-751, Korea

2 Regional Innovation Center for Environmental Technology of Thermal Plasma, Inha University, 253 Yonghyun-Dong, Nam-Ku, Incheon 402-751, Korea

Abstract

Ionic liquids and ionic liquid-based materials have emerged as sorbents for carbon dioxide capture. Amino-imidazolium materials, a kind of sorbents, were synthesized and characterized for the sorption of carbon dioxide. The ionic liquid-modified materials have higher sorption capacity of carbon dioxide than the unmodified sorbents. The effects of pressure and temperature were investigated. The adsorbed amount of carbon dioxide increased with the increasing pressure and the ionic liquid-based polymer show higher sorption efficiency than that of ionic liquid-based silica.

Introduction

Recently, ionic liquids, organic salts with a low melting point, have emerged as nonvolatile and reversible carbon dioxide sorbents for CO₂ capture. Supported liquid membranes using ionic liquids have also been developed. Bates et al. developed a task-specific ionic liquid for CO₂ capture by introducing an amine group to the ionic liquid, substantially increasing its CO₂ solubility. However, liquid and viscosity of ionic liquids cause the complication of processing.

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