Separation of organic matter from asphaltite with supercritical fluid mixtures

Erol, Murat; Demirel, Belma; Toğrul, Taner; Çalımlı, Ayla

doi:10.1016/0378-3820(94)00057-z

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…In agreement with this argument, several authors ,− reported considerable differences in the yields (wt%) and compositions of the oils obtained from oil shale and carbon when solvents of different polarity are used.…”

Section: Resultssupporting

confidence: 52%

Extraction of Kerogen from Oil Shale (Puertollano, Spain) with Supercritical Toluene and Methanol Mixtures

Torrente

Galán

2010

Ind. Eng. Chem. Res.

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The solubility of kerogen from Puertollano (Spain) oil shales in supercritical mixtures of toluene and methanol with 20, 40, 60, and 80 mol % methanol were studied in a range of temperatures and pressures of 603-623 K and 7.0-20.0 MPa, respectively. The bitumen obtained with each of the solvents and operation conditions was analyzed by gas chromatography coupled with a mass detector. The results indicate that the composition of the bitumen is dependent on the supercritical solvent and independent of the operation conditions. Solubility data were correlated with the Chrastil equation. This model correlates the experimental data properly when the conditions are distant from the critical point. From this equation, the solvation parameter k was found to be between 0.9 and 1.5 for different mixtures of toluene and methanol. Singular values of k were obtained for mixtures with 20 and 40 mol % methanol. This is probably due to a certain molecular aggregation between the toluene and methanol, perhaps an azeotrope, at those concentrations and operation conditions.

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Section: Resultssupporting

confidence: 52%

Extraction of Kerogen from Oil Shale (Puertollano, Spain) with Supercritical Toluene and Methanol Mixtures

Torrente

Galán

2010

Ind. Eng. Chem. Res.

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“…Several studies have been performed not only on the occurrence, reserves and reserve characteristics of Southeastern Asphaltites of Turkey, , but also on the evaluation of them ,, as a source of molybdenum and nickel, for ammoniac production, liquefaction, etc. However, the studies related to the combustion of asphaltite as a fossil fuel is limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Heating Rate on the Combustion of Silopi Asphaltite

2002

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In this study, the effects of particle size and heating rate on the combustion properties of Silopi asphaltite were investigated. Nonisothermal thermogravimetry experiments were carried out at three different size fractions and five different heating rates. The TG/DTG experiments were carried out from ambient to 900 °C in air. The data obtained were analyzed for the determination of the combustion characteristics of the sample. Also an Arrhenius type kinetic model complemented with the weighed mean activation energy concept was utilized to find out the kinetics of the reactions.

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“…Only 42% of the total acid was consumed within the first minutes with the slower period much longer than 10 h. The ash content of 36% is higher than any lignite (Seferinoglu et al, 2003) so it is probable that leaching is influenced by mineral impurities. A lower permeability may also influence the time dependence (Clarkson and Bustin, 1997;Erol et al, 1995). Silopi asphaltites are known to be denser and less fissured than Turkish lignites (MTA Geology Dept.…”

Section: Coals Vs Coal-ashesmentioning

confidence: 99%

“…Removal of non-combustible phases should also enhance the permeability during the liquefaction process (Gü venç et al, 1994), and limit the volume of solid residues. Such acid preprocessing, followed by normal hydro-treatment, constitutes an alternative to supercritical processing (Erol et al, 1995).…”

Section: Dwhole Coalt Processingmentioning

confidence: 99%