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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1480 D.W. Rooney, K.R. Seddon<br />

Cation Anion ρ, gcm -3 at 25 o C<br />

1-butyl-3-ethylimidazolium<br />

Triflate (CF 3SO 3) 1.27 161<br />

Mesylate (CH 3SO 3) 1.14 161<br />

1-dodecyl-3-ethylimidazolium Triflate (CF 3SO 3) 1.10 161<br />

Trimethylsulfonium<br />

Cl/AlCl 3 (ratio 2) 1.40 163<br />

Br/AlCl 3 (ratio 2) 1.59 163<br />

Br/AlBr 3(ratio 2) 2.40 163<br />

21.2.6 SUMMARY<br />

In summary ionic liquids have a proven ability to enhance current industrial chemistry.<br />

Within current industrial processes using conventional solvents, selectivities, TOF and reaction<br />

rates are effectively uncontrolled: however by using ionic liquid media for the catalysis,<br />

it is possible to have a pr<strong>of</strong>ound influence on all these factors. Tailoring <strong>of</strong> the ionic<br />

liquid by a combination <strong>of</strong> subtle (i.e., changing cation substitution patterns) and gross (anion<br />

type) modifications can permit very precise tuning <strong>of</strong> reactions.<br />

Ionic liquids have a proven ability to be used as effective solvents and catalysts for<br />

clean chemical reactions; as replacements for volatile organic and dipolar aprotic solvents<br />

(i.e. DMF, DMSO) and solid acid catalysts in reactions whether being used at the laboratory<br />

or industrial scale. Many <strong>of</strong> their physical properties are in the same region as organic solvents<br />

and as such could easily be incorporated into any future processes. Properties such as<br />

negligible vapor pressure and high density/variable interfacial tension <strong>of</strong>fer considerable<br />

advantages in the design <strong>of</strong> unit operations such as evaporators, mixer-settlers and reactors.<br />

It is envisaged that as more information is gathered on their physical properties it will be<br />

possible to accurately design and optimize entire plants around these novel solvent systems.<br />

In a time where considerable emphasis is being placed on clean reactions and processes with<br />

minimal waste and efficient product extraction ionic liquids have emerged as a novel and<br />

exciting alternative to modern production methods. They are truly designer solvents.<br />

REFERENCES<br />

1 W. Pitner, D. Rooney, K. Seddon, R. Thied, World Patent, WO9941752.<br />

2 W. Pitner, M. Fields, D. Rooney, K. Seddon, R. Thied, World Patent, WO9914160.<br />

3 P. Davey, M. Earle, C. Newman, K. Seddon, World Patent, WO9919288.<br />

4 C. Lok, M. Earle, J. Hamill, G. Roberts, C. Adams, K. Seddon, World Patent, WO9807680.<br />

5 C. Greco, F. Sherif, L. Shyu, U.S. Patent, US5824832.<br />

6 W. Keim, P. Wasserscheid, World Patent, WO9847616.<br />

7 O. Hodgson, M. Morgan, B. Ellis, A. Abdul-Sada, M. Atkins, K. Seddon, U.S. Patent, US5994602.<br />

8 S. Takahashi, N. Koura, S. Kohara, M.L. Saboungi, L.A. Curtis, Plasmas and ions, 2, (1999).<br />

9 A.Carmichael, M. Earle, J. Holbrey, P. McCormac, K. Seddon, Organic letters, 1, 7, 997-1000, (1999).<br />

10 C. DeBellefon, E. Pollet, P. Grenouillet, J. Mol. Cat. A-Chemical, 145, (1999).<br />

11 W. Chen, L. Xu, C. Chatterton, J. Xiao, Chem, Com., 13, (1999).<br />

12 L. Simon, J. Dupont, R. deSouza, Applied Catalysis A-General, 175, (1998).<br />

13 S. Silva, P. Suarez, R. deSouza, J. Dupont. Polymer Bulletin, 40, 4-5, (1998).<br />

14 Y. Chauvin, H. Olivier, C.N. Wyrvalski, L.C. Simon, R.F. De Souza, J. Catalysis, 165, 2, (1997).<br />

15 Y. Chauvin. and H. Olivier-Bourbigou, Chemtech, 25, (1995).<br />

16 Y. Chauvin, Actualite Chimique, (1996).<br />

17 M. Freemantle, Chem. Eng. News, 76, (30th March 1998).<br />

18 M. Freemantle, Chem. Eng. News, 76, (24th August 1998).<br />

19 M. Freemantle, Chem. Eng. News, 77, (4th January 1999).<br />

20 C.L. Hussey, Adv. Molten Salt Chem., 5, (1983).

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