화학공학소재연구정보센터
Fuel, Vol.234, 1422-1430, 2018
Characterisation of the products of low temperature pyrolysis of Victorian brown coal in a semi-continuous/flow through system
Two Victorian brown coal samples, a run-of-mine Loy Yang coal (LY) and a Loy Yang light lithotype (LL), were subjected to pyrolysis at 420-460 degrees C and 330-460 degrees C, respectively, under a continuous nitrogen flow. The process produced condensed products in two phases, oil and aqueous, as well as solid residue and gaseous products. An increase in the condensed product yields with increasing temperature was observed for both coals, with LL achieving higher yield than LY at a given temperature (e.g. 26.3 wt% vs 19.5 wt% at 460 degrees C). The condensed products were characterized by H-1 and C-13 NMR as well as GC-MS. Abundant triterpenoid polycyclics and aliphatic hydrocarbons were found in the oils from both coals produced at lower temperatures, whilst the yield of aromatics significantly increased with increasing pyrolysis temperature. Analyses of the solid residues by FTIR, solid state C-13 NMR and flash pyrolysis GC-MS (Py-GC-MS) also revealed an increasing aromaticity of the residues at higher temperatures. Py-GC-MS analysis identified compound groups released by flash pyrolysis at 650 degrees C and the results were found to correspond to those of GC-MS for the oil.