Coal conversion in co-processing with heavy petroleum residues (2023)

Cited by (8)

  • Relationship between properties and conversions of North Bohemian coals during coal/oil coprocessing

    1997, Fuel Processing Technology

    Eleven low rank coals from North Bohemian mines were comprehensively characterized by using a number of analytical methods. Along with common proximate and ultimate analysis, spectroscopic techniques, porosity measurement, extractability and swelling in organic solvents were used. Although coals were of similar geological origin, some of their characteristics largely differed from one coal to another. Coals were coprocessed with petroleum vacuum residue at 440°C for 1 h and yields of reaction products and coal conversions were determined. Despite the differences in composition and properties, the coals provided similar conversions and yields of distillable reaction products. A small positive effect on coal conversion was found for ash content and microporosity of coals. However, a small negative effect was found for carbon content, optical reflectance and solvent extractability of coals.

  • Influence of Fe and FeMo high loading supported catalysts on the coprocessing of two Spanish lignites with a vacuum residue

    1994, Fuel Processing Technology

    The catalytic coprocessing of two Spanish lignites with a vacuum residue of petroleum has been studied. Two catalysts supported on γ-Al2O3, with loadings of 25% Fe2O3 and 25% Fe2O3/10% MoO3, have been tested at temperatures from 400 to 425°C with an initial hydrogen pressure of 8 MPa. Results show that both catalysts improve the conversion of coal and upgrade the liquid product distribution. When a high ash lignite is used the catalytic effect of the own mineral matter overcomes the effect of added catalysts. The FeMo catalyst yields the highest coal conversion, oil production and desulphuration within the range of temperatures studied.

  • Influence of temperature and hydrogen partial pressure on the coprocessing of two Spanish lignites with a vacuum residue

    1992, Fuel

    This work studies the influence of temperature and hydrogen availability on the coprocessing of two high sulphur content Spanish lignites, with a petroleum vacuum residue. The experimental results show that temperature and partial pressure of hydrogen have a great influence on the conversion of coal and on the quality of oils formed. The conversion increases with temperature of reaction until a maximum is achieved. This maximum is between 400 and 420 °C depending on the reaction conditions. Beyond this maximum the conversion drops quickly, even producing negative results, due to recombination reactions. A higher hydrogen partial pressure induces a larger coal conversion but the maximum is achieved at lower temperatures. On the basis of these results, hydrogen transfer through aromatic compounds is proposed as the reaction mechanism of coprocessing.

  • Elucidation of the nature of naphtheno-aromatic groups in heavy petroleum fractions by <sup>13</sup>C n.m.r. and catalytic dehydrogenation

    1991, Fuel

    13C n.m.r. spectral editing techniques have been used to determine the concentrations of aliphatic CH, CH2 and CH3 groups directly in aromatic fractions from a North Sea waxy heavy distillate (vacuum gas oil) and a hydrotreated sample of this distillate. To help resolve effective and poor hydrogen-donor naphthenic groups, these fractions were catalytically dehydrogenated and re-examined by 13C n.m.r.. The results indicate that naphthenic groups in the initial aromatic fraction account for a maximum of 40% of the total carbon but only 10% of the carbon is present in effective hydrogen donors and that, in contrast to earlier structural models for heavy petroleum fractions, the naphthenic groups are relatively small comprising no more than two rings on average.

  • Solid fuels and heavy hydrocarbon liquids: Thermal characterization and analysis thermal characterization and analysis: Second Edition

    2017, Solid Fuels and Heavy Hydrocarbon Liquids: Thermal Characterization and Analysis Thermal Characterization and Analysis: Second Edition

  • Improving the solvent deasphalting process by the co-treating of residue and coal

    2013, Energy Sources, Part A: Recovery, Utilization and Environmental Effects

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