SAIKIA , B K and SAHU , O P and BARUAH , R K
(2007)
FT-IR spectroscopic investigation of high sulphur assam coals and their solvent-extracts.
J GEOLOGICAL SOCIETY OF INDIA, 70 (6).
pp. 917-922.
Abstract
The FT-IR spectroscopic techniques were used to
understand the structural feature of four samples of high
sulphur Assam coals and their extracts in polar solvents.
Pyridine, N, N-Dimethyl Acetamide and Ethyl Acetate
were used for extraction of the coals at their reflux
temperatures in a Soxhlet apparatus. The
difference-FT-IR spectroscopic technique was used to
characterize the compositions of extracts. The extracts
were found to contain characteristic absorption bands of
original coals. Both aromatic and aliphatic C-H stretching
bands were observed in the spectra of extracts. The
spectral interpretations of the extracts closely resembled
the parent coal structures. The relative transmittances of
characteristic bands in extract spectrum suggest that the
distribution of functional groups in coals were somewhat
effected due to the interaction with the solvents. The
spectra show some depletion of bands along with
increase in some regions. The information regarding the
structure of coal and extracts obtained by this method
are qualitative in nature but very much useful in coal
utilizations. © Geol. Soc. India.
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