Controlled separation of low temperature coal tar based on solvent extraction–column chromatography

Gradient separation of ⩾300°C distillate from low-temperature coal tar based on formaldehyde reactions

“…The complex phenols-rich were hard to utilize, because there are varieties of single compounds with low contents. Pyrenol was found to be the most complex phenols in all detectable phenols of LTCT using GC-MS [18]. In the FTIR spectra of petroleum ether extract residue from LTCT, there are obvious absorption peaks of phenol compounds.…”

“…LTCT is very complex, which is composed of PAHs with a wide molecular http Fuel 160 (2015) [16][17][18][19][20][21][22][23] Contents lists available at ScienceDirect Fuel j o u r n a l h o m e p a g e : w w w . e l s e v i e r .…”

Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

“…Two regions, from 3000 to 2800 cm À1 and 1800 to 1490 cm À1 , were used to investigate the structure characteristics of the tar samples in this work. Detailed structural parameters, namely Afactor and CH 2 /CH 3 , can be obtained from curve-tting of these regions and eqn (1) and 2, and the results are shown in Fig. 7.…”

“…Tar, a signicant by-product of the pyrolysis of coal, biomass or their blends, is a potential feedstock for value-added substances and materials, such as chemical products and liquid fuels. [1][2][3][4] Tar is a complex mixture of condensable hydrocarbons comprising single-ring to 5-ring aromatic compounds plus other oxygen-containing hydrocarbons and complex polyaromatic hydrocarbons (PAHs). [5][6][7][8] It should be noted that tar is different from bio-oil, which is also the pyrolysis product of biomass or biomass-coal blends and is usually dened as a dark brown, free-owing organic liquid comprising highly oxygenated compounds, because they have different components and source conditions.…”

Application of mass spectrometry in the characterization of chemicals in coal‐derived liquids

“…Due to the high complexity in molecular compositions of crude coal tar, the chromatographic peaks of various compounds with similar structures or physicochemical properties overlap in GC/MS analysis. Therefore, separation methods, such as distillation, liquid‐liquid extraction, and column chromatography, have been applied to facilitate the compositional characterization of coal tar by GC/MS and fine separation of valuable chemicals such as condensed arenes and phenols (Morgan et al, ; Long et al, ; Pan et al, ; Yao et al, ; Li et al, ; Jiao et al, ,b; Sun et al, ). Two coal tar distillate fractions, i.e., creosote oil (100–300 °C boiling range) and anthracene oil (250–370 °C boiling range), were analyzed with GC/MS (Morgan et al, ).…”