Ionic liquids are salts, usually with organic cations and inorganic anions, that are liquid at room temperature. There are a wide variety of ionic liquids that can be synthesized with different properties for different applications. They are generally non-volatile, non-toxic, and non-flammable with high heat capacity, high density, high thermal and chemical stability. We propose its use as an absorbent in an absorption refrigeration cycle. The refrigerant in this case would be a gas such as carbon dioxide. The present work deals with the desirable properties of ionic liquids for this application. For example, the absorbent must have a high solubility, and the heat and mass transfer coefficients of the absorbent-refrigerant solution must be large. The viscosity of the mixture, on the other hand, should not be so large as to make its pumping difficult.

1.
Blanchard
L.
,
Hancu
D.
,
Beckman
E.
, and
Brennecke
J.
,
1999
. “
Green processing using ionic liquids and CO2
”.
Nature
,
399
, pp.
28
29
.
2.
Anthony
J.
,
Maginn
E.
, and
Brennecke
J.
,
2002
. “
Solubilities and thermodynamic properties of gases in the ionic liquid 1-n-butyl-3-methyl imidazoliumhexafluorophosphate
”.
J. Phys. Chem. B
,
106
(
3)
, pp.
7315
7320
.
3.
Brennecke
J.
,
Blanchard
L.
,
Anthony
J.
,
Gu
Z.
,
Zarraga
I.
, and
Leighton
D.
,
2002
. “
Separation of species from ionic liquids
”.
ACS Symposium Series
,
819
, pp.
82
96
.
4.
Sun
H.
,
2005
. “
Ionic liquids: Progress and prospective
”.
Chinese Journal of Chemical Engineering
,
13
(
6)
, pp.
830
834
.
5.
Pandey
S.
,
2006
. “
Analytical applications of roomtemperature ionic liquids: A review of recent efforts
”.
Analytica Chimica Acta
,
556
(
1)
, pp.
38
45
.
6.
Wu, B., Reddy, R., and Rogers, R., 2001. “Novel ionic liquid thermal storage for solar thermal electric power systems”. In Proceedings of Solar Forum 2001 Solar Energy: The Power to Choose, Vol. 39, p. 7 pp.
7.
Moens
L.
,
Blake
D.
,
Rudnicki
D.
, and
Hale
M.
,
2003
. “
Advanced thermal storage fluids for solar parabolic trough systems
”.
ASME Journal of Solar Energy Engineering
,
125
(
1)
, pp.
112
116
.
8.
Valkenburg
M. V.
,
Vaughn
R.
,
Williams
M.
, and
Wilkes
J.
,
2005
. “
Thermochemistry of ionic liquid heat-transfer fluids
”.
Thermochimica Acta
,
425
(
1–2)
, pp.
181
188
.
9.
Wilkes
J.
,
2004
. “
Properties of ionic liquid solvents for catalysis
”.
Journal of Molecular Catalysis A: Chemical
,
214
, pp.
11
17
.
10.
Yokozeki
A.
,
2005
. “
Theoretical performances of various refrigerant-absorbent pairs in a vapor-absorption refrigeration cycle by the use of equations of state
”.
Applied Energy
,
80
, pp.
383
399
.
11.
Shiflett
M.
, and
Yokozeki
A.
,
2005
. “
Solubilities and diffusivities of carbon dioxide in ionic liquids: [bmim][PF6] and [bmim][BF4]
”.
Ind. Eng. Chem. Res.
,
44
, pp.
4453
4464
.
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