I. Ll and . Halasz, , p.480, 1978.

. Halasz, , p.571, 1979.

G. P. Blumer, H. W. Kleffner, W. Lùke, and M. Zander, Fuel, vol.14, issue.59, p.600, 1980.

S. R. Moinelo, R. M. Menedez, J. Bermejo, and A. Garcia, Proc. 1985 Int. Conf. Coal, p.759, 1985.

S. R. Moinelo, R. M. Menendez, and B. , Fractionation of coal-derived liquids by extrography, Fuel, vol.67, issue.5, p.682, 1988.
DOI : 10.1016/0016-2361(88)90299-2

M. Alula, D. Dumay, D. Cagniant, and . Int, Conf. Coal Science, p.707, 1987.

M. Alula, , 1988.

M. Farcasiu, T. O. Michell, D. D. Whitehurst, D. D. Whitehurst, S. E. Butrill et al., Coal liquefaction, p.994, 1980.

V. !. Cebolla, R. Bacaud, and M. Besson, Bull. Soc. Chim. France, p.935, 1987.

P. Cleon, . Dr, and . Ing, Tàesr's University, 1984.

V. L. Cebolla, . Spain, J. C. Lauer, H. Valles, and D. Cagniant, Fuel, vol.67, p.1273, 1988.

M. Alula, D. Cagnianl, and R. Gruber, Fuel Proc. Tech, p.81, 1988.

, FUE1, vol.68, 1335.

, Band Posit.lons

G. Free, scret,ch ArooaÈlc C-ll sÈretch AllphaÈic C-H srretch KeÈone C-0 sËreÈch Carboxyllc acLd monomer C=0 stretch Carboxyllc acid dlner C=0 streÈch Ester C=0 sÈreEch Àoide C-0 st,reÈch AllphaÈlc C-H bend Hethyl synnetrlc C-H bend C-0 sÈreEch AronaÈlc C-Il bend Figure t Gas capillary (A) and corresponding HPLC chromatograms (B) of the different subfractioos (50-ml) eluted on rhe-picriè acid column (ÈeP hydlogenated wilh RiCly'NaBH). T2, pp.3-97

L. Absorbance, Bro 0:7it0' il il ,J\*-' .4 -* Gas chromalographic(GC) rotonlion limes(mn) -> HPLC rotontion times References tll C. W. Curris, F. N. Cassel, Energy & Fuel, 8D. tZl f. n. Brower, J. Paiak,Energy & Fuel, p.363

. Ilj-n, C. Uorttont, H. Deng, S. Nagaishi, Y. Shimomura et al., Energy & Fue!, vol.2, p.529, 1988.

D. C. Cronauer, D. M. Jewell, Y. T. Shah, R. Modl, and K. Seshadri, Ind. Eng. Chem. Fuodam, vol.4, p.368

B. Fizary and P. Perchec, Fuel, vol.6, p.218, 1989.

I. P. Fbhet and M. F. Wihon, Eoergr & Fuel' 2' 548, p.988

1. N. Uanom, D. F. Mcmillen, and D. S. St, tohn, Energy & Fuel, vol.3, p.465, 1989.

S. Orra, H. Iroh, M. Makabe, and K. Ouchi, Fuel, vol.64, p.902, 1985.

S. C. Sànr, R. M. Baldwin, and R. Miller, Energy & Fuel, vol.3, issue.1e89, p.71

R. C. , Fuel. ss, vol.237

R. A. Wozniatç and . Hites, Anal. Chem, vol.55, p.761, 1983.

Z. F. Hites and A. Chem, , p.985, 1320.

U. Diack, R. Gruber, D. Cagniant, H. Charcosset, S. Bacaud et al., Symposium oo Coal Scieoce 1989' Rolduc' The Netbertands. Fuei process-Technol' 24, pp.151-190, 1984.

P. P. Fq and R. C. Harvey, Tettahedron letters' 5,415 ç97)' iiàj p. r. Fta H. M. Lee

L. Ltll-ii.-tiiinsky and . Zechmeisrer, J. Am' Chem' Soc', vol.75, p.5495, 1953.

. P. T18l-i-'., H. M. Fu, H. G. Lee, . M. Harvey-'j, M. Aiula et al., Org' Chem' 1s' 279'lLa cancérisation par les substances ' chimiques et ta structure moléculaire Received, Masson, vol.6, issue.13, pp.1330-485, 1951.

, Accepted, 1990.