Characterization of the ability of CO2 to act as an antisolvent for ionic liquid/organic mixtures

被引:48
作者
Mellein, Berlyn R. [1 ]
Brennecke, Joan F. [1 ]
机构
[1] Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
关键词
D O I
10.1021/jp0671695
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This paper discusses the ability of CO2 to induce liquid/liquid-phase separation in mixtures of ionic liquids and organics. New data for the solubility of CO2 in the ionic liquid/organic mixtures and the volume expansion of the mixtures with added CO2 are used to analyze the results. Acetonitrile, 2-butanone, and 2,2,2-trifluoroethanol are chosen to distinguish dipolar and hydrogen-bonding interactions. Likewise, 1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-n-hexyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide, 1-n-hexyl-3-methylimidazolium triflate, and ethyl-dimethyl-propylammonium bis (trifluoromethylsulfonyl)imide were studied to vary hydrogen-bond-donating and -accepting abilities of the ionic liquids. Primarily, the ability of CO2 to act as an antisolvent depends on the solubility of the CO2 in the ionic liquid/organic mixture. Strong hydrogen bonding between the ionic liquid and the organic makes it more difficult for CO2 to induce a liquid/liquid-phase separation.
引用
收藏
页码:4837 / 4843
页数:7
相关论文
共 25 条
[1]   High-pressure phase behavior of carbon dioxide with imidazolium-based ionic liquids [J].
Aki, SNVK ;
Mellein, BR ;
Saurer, EM ;
Brennecke, JF .
JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (52) :20355-20365
[2]   Ternary phase behavior of ionic liquid (IL)-organic-CO2 systems [J].
Aki, Sudhir N. V. K. ;
Scurto, Aaron M. ;
Brennecke, Joan F. .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2006, 45 (16) :5574-5585
[3]  
Badilla JCDF, 2000, J SUPERCRIT FLUID, V17, P13
[4]   Recovery of organic products from ionic liquids using supercritical carbon dioxide [J].
Blanchard, LA ;
Brennecke, JF .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2001, 40 (01) :287-292
[5]   Green processing using ionic liquids and CO2 [J].
Blanchard, LA ;
Hancu, D ;
Beckman, EJ ;
Brennecke, JF .
NATURE, 1999, 399 (6731) :28-29
[6]  
Bösmann A, 2001, ANGEW CHEM INT EDIT, V40, P2697, DOI 10.1002/1521-3773(20010716)40:14<2697::AID-ANIE2697>3.0.CO
[7]  
2-W
[8]   Asymmetric hydrogenation and catalyst recycling using ionic liquid and supercritical carbon dioxide [J].
Brown, RA ;
Pollet, P ;
McKoon, E ;
Eckert, CA ;
Liotta, CL ;
Jessop, PG .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (06) :1254-1255
[9]   Why is CO2 so soluble in imidazolium-based ionic liquids? [J].
Cadena, C ;
Anthony, JL ;
Shah, JK ;
Morrow, TI ;
Brennecke, JF ;
Maginn, EJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (16) :5300-5308
[10]   Solvent-solute interactions in ionic liquids [J].
Crowhurst, L ;
Mawdsley, PR ;
Perez-Arlandis, JM ;
Salter, PA ;
Welton, T .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (13) :2790-2794