Dependence of liquefaction behaviour on coal characteristics10. Structural characteristics of a set of high-sulphur coals and the asphaltenes derived from them

Shadle, Lawrence J.; Neill, P.H.; GIVEN, T

doi:10.1016/0016-2361(88)90062-2

Cited by 11 publications

(4 citation statements)

References 17 publications

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“…As great as 73.7% of OMA conversion degree was reached when the final temperature of the asphaltite liquefaction process was 450°C, i.e. OMA conversion was lower than in similar coal processing [15]. Color by ASTM D 1500, conv.…”

Section: Savel'ev Et Al / High-sulfurous Argentinian Asphaltites Amentioning

confidence: 94%

“…These experiments showed that about 70% of asphaltite organic mass may be converted into valuable liquid hydrocarbon products compared with 30% in the process of brown coal liquefaction under the same operational conditions [15].…”

Section: Thermal Decomposition Of R-03 Asphaltite Samplesmentioning

confidence: 95%

“…the length of the chemical bond of carbon atoms located at α-positions to aromatic nuclei in the same plane [8]); hence, equal to 10.6-11.0 Å. Such dimensions are characteristic of condensed tetra-and pentacyclic aromatic nuclei [15][16][17][18][19].…”

Section: Structural Features Of Asphaltites and Their Isolated Fractionsmentioning

confidence: 99%

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High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Савельев

Головко

Gorbunova

et al. 2008

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Asphaltites d'Argentine à forte teneur en soufre et les produits de leur liquéfaction thermique -Ce travail présente les résultats d'une étude approfondie de la nature chimique des asphaltites des gisements Rafaelita et Toribia (des provinces Mendoza et Neuquéen en Argentine) ainsi que des propositions pour le traitement de ces charges. La composition et les particularités structurales des composants maltènes, asphalténiques et hydrocarbonés plus légers de ces composés, proches du charbon, ont été étudiées. Des expériences en laboratoire sur la liquéfaction thermique des asphaltites ont été réalisées, incluant : 1) une pyrolyse à températures croissantes jusqu'à 600 °C ; 2) une conversion thermique en condition de température programmée allant de 25 jusqu'à 350 ou 450 °C en fixant une rampe de montée en température de 5°C par minute et avec récupération des produits de réaction dans un gazole de distillation directe ; 3) un traitement thermique des échantillons étudiés sous conditions stationnaires (à 350°C pendant une heure dans l'eau, la tétraline ou le n-décane) ; et finalement 4) une transformation thermique des échantillons d'asphaltites sous différentes atmosphères (injection en continu dans le réacteur d'eau ou de décane, la température variant de 25°C jusqu'à 500°C, avec prises d'essais à différents niveaux de température). Le rendement le plus élevé en produits de conversion a été obtenu lorsque la conversion thermique a été réalisée en milieu hydrocarboné à des températures pas plus faibles que 400-450°C, en prélevant en continu les produits formés pendant la réaction. Le rendement en hydrocarbures légers a atteint 25% poids de la quantité organique d'asphaltite initiale lorsque le n-décane a constitué le milieu réactionnel, et a pu croître jusqu'à 70% poids en substituant ce solvant par une coupe gazole. Abstract -High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products -The results of profound chemical studies of asphaltites from the Rafaelita and Toribia fields (Mendosa and

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Section: Savel'ev Et Al / High-sulfurous Argentinian Asphaltites Amentioning

confidence: 94%

Section: Thermal Decomposition Of R-03 Asphaltite Samplesmentioning

confidence: 95%

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High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Савельев

Головко

Gorbunova

et al. 2008

Oil & Gas Science and Technology - Rev. IFP

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“…Given and co-workers found that the techniques available (at the time) for analyzing coal and coal liquids limited the exploration of this topic. − In recent years, nuclear magnetic resonance (NMR) has been used to correlate coal characteristics to coal liquefaction , or pyrolysis products . Flash pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) has been used for coal characterization, e.g., to monitor transformation of maceral groups through coalification. − We hypothesized that a combination of these techniques could be useful in predicting the major structural characteristics of the liquefaction products without undertaking extensive liquefaction experimentation.…”

Section: Introductionmentioning

confidence: 99%

Relationship of Coal Characteristics Determined by Pyrolysis/Gas Chromatography/Mass Spectrometry and Nuclear Magnetic Resonance to Liquefaction Reactivity and Product Composition

Burgess

Schobert

1998

Energy Fuels

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Five coals, ranging in rank from subbituminous to high-volatile A bituminous, were examined by 13 C NMR and flash pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). They were also subjected to liquefaction in batch microautoclave reactors at three sets of conditions: 360°C for 1 h in pyrene; 425°C similarly; and temperature-programmed liquefaction for 15 min at 200°C and 30 min at 425°C in 9,10-dihydrophenanthrene with a sulfided molybdenum catalyst. Four of the five coals showed good relationships between the structural fragments observed in Py-GC/MS and the dominant compound types in the hexane-soluble products from liquefaction at temperatures g400°C. For example, DECS 12 Pittsburgh seam hvA bituminous coal showed a dominance of alkylnaphthalenes in the pyrogram, and this compound class was also dominant in the gas chromatogram of the hexane solubles. 13 C NMR showed a relationship of f a H to conversion of coal to liquids at 425°C for 1 h. The combination of 13 C NMR and Py-GC/MS is useful for determining the probable light reaction products of direct liquefaction. The correlations indicate relationships between the compositions of the light fraction of the liquefaction products and coal structural information. The combined characterization approach described here could be used for screening of a wide suite of candidate feedstocks to winnow a few promising candidates for detailed testing.

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The Origin of Coals

Given

1988

New Trends in Coal Science

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Dependence of liquefaction behaviour on coal characteristics10. Structural characteristics of a set of high-sulphur coals and the asphaltenes derived from them

Cited by 11 publications

References 17 publications

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Relationship of Coal Characteristics Determined by Pyrolysis/Gas Chromatography/Mass Spectrometry and Nuclear Magnetic Resonance to Liquefaction Reactivity and Product Composition

The Origin of Coals

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