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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 630 pages |
| ISBN: | 978-0-9879917-2-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Synthesis And Application Of Functionalized Ionic Liquids For Carbon Dioxide Absorption
Carlos Carlesi1; Romel Jimenez2; Mauricio Flores3; Christian Bidart4;1PONTIFICIA UNIVERSIDAD CATOLICA DE VALPARAISO, Valparaíso, Chile; 2UNIVERSIDAD DE CONCEPCIóN, Concepcion, Chile; 3UNIDAD DE DESARROLLO TECNOLóGICO (UDT)-UNIVERSIDA, Concepcion, Chile; 4KARLSRUHE INSTITUTE OF TECHNOLOGY (KIT)-INSTITUTE, Karlsruhe, Germany;
Type of Paper: Regular
Id Paper: 96
Topic: 6
Abstract:
The capture of carbon dioxide from combustion of fossil fuels, treatment of natural gas or from chemical process in general represents a critical component of efforts aimed to reduce the greenhouse gases in the atmosphere. In this way, significant effort has been put in order to design new and more efficient process for capturing carbon dioxide and with lower losses.The state-of-the art technology based on absorption to capture carbon dioxide normally uses solutions of alkanolamines, commercial diluted solutions of monoethanolamine or diethanolamine (MEA and DEA respectively), absorbents with high absorption capacity and reasonably stability, or physical solvents such as Selexol (polyethylene glycol) or Rectisol (MeOH), effective and attractive for carbon dioxide removal for treatment of sour gases.Nevertheless, a new approach can be considered to design more efficient and specialized absorbents. To this end, ionic liquids (ILs) have been proposed as solvent reagents for gas separation, mainly due to its low vapor pressure, selectivity, tunable solubility properties and thermal stability.The purpose of the present work is to utilize the ILs 1-butyl-3-methylimidazolium bromide ([bmim] Br) and 1-n-propylamin-3-methylimidazolium bromide ([pamin] Br), as carbon dioxide capture absorbing media for biogas upgrading. Both ILs (being the latter not previously reported in literature) were synthesized from commercially available starting compounds, using ultrasonic techniques, and characterized by NMR and IR analysis. In despite of both to be imidazolium based ILs with good characteristic as absorbers, the latter is a task-specific (TSIL), with a specialized amine (-NH2) group which should improve the carbon dioxide solubility.As a potential application of intensive carbon dioxide absorption system a model biogas (CO2/CH4 equivalent to 40/60), the ILs [bmim] Br and [pamin] Br were tested as absorbents for enrichment of methane of a biogas stream, evaluating the impact of the amine group in the fixation of CO2 and making a systematic comparison with the conventional organic solvents MEA/DEA under similar operating conditions. The effects of temperature and moderated changes of pressures are analyzed and discussed as well.