Solubilization of Taiheiyo coal under mild conditions without gaseous hydrogen: catalysis by trifluoromethanesulfonic acid
1995; Elsevier BV; Volume: 74; Issue: 6 Linguagem: Inglês
10.1016/0016-2361(95)00010-3
ISSN1873-7153
AutoresKen D. Shimizu, Hironori Karamatsu, Atsushi Inaba, Akira Suganuma, Ikuo Saito,
Tópico(s)NMR spectroscopy and applications
ResumoTrifluoromethanesulfonic acid (TFMS) was found to convert coal almost completely to pyridine-solubles in the presence of isopentane at 150°C in 3 h under autogenous pressure of 6.0–6.8 MPa. The chemical structure of the benzene-soluble and THF-insoluble-pyridine-soluble fractions varied with the acid concentration. Lower acid concentrations provided high aromaticity and rich Har and Hα, while higher acid concentrations gave higher Hβ and Hγ. The solubilized coal fractions bore many oxygen functional groups in spite of depolymerization. The ether bonds remained in the pyridine-insoluble fraction, resulting in a high molecular weight. Intermolecular hydrogen bonding of oxygen functional groups appears to be another cause of limited solubility of this fraction.
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