Short communicationSolvent swelling rates of low rank coals and implications regarding their structure
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Cited by (29)
Effect of solvent extraction pretreatments on the variation of macromolecular structure of low rank coals
2018, Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and TechnologyOxidant stimulation for enhancing coal seam permeability: Swelling and solubilisation behaviour of unconfined coal particles in oxidants
2018, FuelCitation Excerpt :The SR data (Fig. 2a) show that coal particles in pyridine appeared to swell, with the SR between 1.6 (+60%) to 2.4 (+140%) and with an average value of 1.98 (+98%). This is in good agreement with the research conducted by Murata using a photographic method (SR = 1.7 to 2.3) [38], the study by Otake who used a volumetric method (SR = 1.9 to 2.4) [44] and Otake’s research (SR = 1.58 to 2.42) [46]. The corresponding Sr of coal particle 2 in pyridine is shown in Fig. 2b, in which the dash line indicates the moving average of Sr.
Aggregate structure evolution of low-rank coals during pyrolysis by in-situ X-ray diffraction
2013, International Journal of Coal GeologyCitation Excerpt :The gases evolved during this stage are attribute to the desorption of water and adsorbed gases, which swelled and cannot evaporate in time from the coal structure under the heat treatment. The disruption of hydrogen bonds, which is higher in low-rank coals due to its higher content of oxygen functionalities (Otake and Suuberg, 1998), was thought as the main reaction during this stage (Arenillas et al., 2003). The swelling of gaseous compounds and broken of hydrogen bonds weaken the intermolecular interaction, and thus causing the increase of interlayer spacing d002.
Molecular dynamic simulation of coal-solvent interactions in Permian-aged South African coals
2011, Fuel Processing TechnologyCitation Excerpt :The kinetic data can be used to calculate the activation energy for solvent swelling. Various studies found that the activation energy for solvent swelling were in the range of 20–60 kJ/mol, suggesting that the activation energy is associated with hydrogen bond disruption [1,14,15]. The contributions of the nonbonding interactions can also be studied by weakening or breaking secondary interactions by C- and O-acetylation or silylation.
Alkali-assisted coal extraction with polar aprotic solvents
2009, Fuel Processing Technology
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Present address: Department of Chemical Engineering, University of Queensland, Brisbane, Australia.