Investigation of extracts of coal by supercritical extraction
1998; Elsevier BV; Volume: 77; Issue: 11 Linguagem: Inglês
10.1016/s0016-2361(98)00012-x
ISSN1873-7153
AutoresQingchun Yuan, Qiumin Zhang, Haoquan Hu, Shucai Guo,
Tópico(s)Coal and Coke Industries Research
ResumoSupercritical extraction of Leping coal was isothermally carried out with toluene and its co-solvent at 335–425°C5–10 MPa in a semi-continuous apparatus. The results indicated that extraction conditions affected the elemental composition, thermogravimetric characteristics and group components of extracts and their fractions. The yield of extract at 380°C with toluene reached a maximum 64 wt% (in daf coal) containing 31 wt% oil which included aliphatics 22 wt%, aromatics 20 wt% and polar compounds 39 wt%. HC atomic ratio of oil in such an extract was 1.38 and its weight loss at 300°C was 30%. Analysis of i.r. and 1H-n.m.r. spectra was employed to characterize the coal extract and its fractions.
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