Effect of extract-containing solvent recycling in degradative solvent extraction of low-grade carbonaceous resources
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Author list: Ashida R., Takahashi R., Wannapeera J., Worasuwannarak N., Kawase M., Miura K.
Publisher: Hindawi
Publication year: 2014
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
The authors have recently proposed a novel method that not only dewaters but upgrades low-grade carbonaceous resources such as biomass, peat, lignite, and sub-bituminous coals. The method comprises a treatment of the raw materials in non-polar solvent, such as 1-methylnaphthalene, at temperatures below 350ฐC, and subsequent separation of the upgraded samples into extract, residue, and gaseous product consisting of CO2 and a negligible amount of hydrocarbon gases at the treatment temperature. The extract is further separated into solvent-soluble fraction, Soluble, and solvent-insoluble fraction, Deposit, at room temperature. The method can produce a large amount of Soluble which consists of ashless, carbon-rich, low-molecular-weight compounds. From the viewpoint of practical application of the proposed method, it is desired to reduce the energy required to separate the Soluble from solvent. In this study a treatment using the solvent saturated with the Soluble has successfully been proposed in order to omit the energy-consuming distillation process of the solvent by enabling solid-liquid separation of the Soluble and solvent.
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