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- W1990476435 abstract "Physisorbed and chemisorbed water in coal can be effectively removed by the use of 2,2-dimethoxypropane (DMP) which reacts with the water to form methanol and acetone. This reaction is rapid and endothermic. An 1H NMR method, based on this reaction, was developed to measure the amount of water in coals of different rank. Integrations of the methyl resonances from acetone and the methylene resonances of cycloheptane, an internal hydrogen standard, were used to determine the number of moles of water reacted. The method was also used to determine the diffusion kinetic parameters and type of diffusion associated with the chemical dehydration of coals. The initial mechanism for the diffusion of the solvent−reactant into the macromolecular structure of coal can be either Fickian or Case II depending on the coal. From the kinetic study, it was found that external and internal sorbed water were removed sequentially. Free or surface sorbed water is nearly instantaneously removed followed by the water in the intern..." @default.
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- W1990476435 date "1996-03-20" @default.
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- W1990476435 title "Use of 2,2-Dimethoxypropane and <sup>1</sup>H NMR To Distinguish and Quantify the External and Internal Sorbed Water in Coals" @default.
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- W1990476435 doi "https://doi.org/10.1021/ef950114+" @default.
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