Evaluation of ring size distribution in a heavy oil based on boiling point and molecular weight distributions

Satou, Masaaki; Itoh, Daisuke; Hattori, Hideshi; Yoshida, Tadashi

doi:10.1016/s0016-2361(99)00168-4

Cited by 11 publications

(9 citation statements)

References 7 publications

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“…The correlations represent T nb (°C) as various functions of molecular weight and carbon number (additional details in the Supporting Information). − Calculations were carried out using the temperature units specified in a given source as is and then converted to degree Celsius for use herein. These correlations were applied to monomers of p -coumaryl alcohol (H-unit), coniferyl alcohol (G-unit), and sinapyl alcohol (S unit) and their respective β-O-4-connected dimers, trimmers, and tetramers.…”

Section: Results and Discussionmentioning

confidence: 99%

Vacuum Pyrolysis of Hybrid Poplar Milled Wood Lignin with Fourier Transform-Ion Cyclotron Resonance Mass Spectrometry Analysis of Feedstock and Products for the Elucidation of Reaction Mechanisms

Terrell

Garcı̀a-Pèrez

2020

Energy Fuels

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The pyrolysis of lignocellulosic materials is a promising technique to produce fuels and chemicals. It is well known that the most abundant products of lignin pyrolysis are oligomeric molecules, known as pyrolytic lignin (PL). The chemical composition of PL has been extensively studied; however, there is still an important debate whether these oligomers are produced directly from the lignin or from the recombination of monomeric pyrolytic products. Existing theories are unable to describe the effect of vacuum on the distribution of pyrolysis products. Hybrid poplar milled wood lignin (MWL) was initially isolated and thoroughly characterized by Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). Chemical formulas were assigned to each oligomeric compound detected. The MWL was also subjected to vacuum pyrolysis in a modified pyroprobe at 250, 750, and 1000 mbar (absolute pressure), and the resulting liquid products were analyzed by FT-ICR MS. A new strategy to assign structural representations to the oligomeric PL products is proposed, based on the plausible pyrolysis reaction mechanisms of depolymerization/fragmentation applied to original MWL oligomer formulas. Our results support the hypothesis that PL is formed from the removal of moieties from primary lignin pyrolysis products with between three and five aromatic rings. This depolymerization/fragmentation allows the oligomers to reduce their molecular weights to the point where they can be removed from the reaction zone by direct vaporization. This phenomenon highlights the importance of pressure on removal mechanisms and their impact on the molecular weight of the resulting products from lignin pyrolysis.

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Section: Results and Discussionmentioning

confidence: 99%

Vacuum Pyrolysis of Hybrid Poplar Milled Wood Lignin with Fourier Transform-Ion Cyclotron Resonance Mass Spectrometry Analysis of Feedstock and Products for the Elucidation of Reaction Mechanisms

Terrell

Garcı̀a-Pèrez

2020

Energy Fuels

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“…5,6 The particles of FCC catalysts include Y zeolite as 3 the main component supported on a matrix (active or inactive) together with various additives, fillers and binders. 16,17 It is the objective of this work to study the conversion of alkylaromatic, naphthenicaromatic and polyaromatic hydrocarbons which can be found in typical and residual cuts used as FCC feedstocks, 18,19 with emphasis in the products belonging to the heavy end of gasoline and light end of LCO cuts, in order to generate useful information to assist in the formulation of new, more selective FCC catalysts. 6,7 Then, if specific catalysts are to be developed to decrease the selectivity to aromatic hydrocarbons in middle distillate cuts, it is necessary to know the mechanisms controlling the formation of these compounds in the cut, and the contribution to the group from the various components in the feedstocks.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

2015

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The distribution of products in the range of gasoline and middle distillates cuts obtained in the catalytic cracking of heavy aromatics and polycyclic aromatic hydrocarbons over a FCC catalyst was studied. 1-Phenyloctane, biphenyl, fluorene, 9,10-dihydrophenanthrene, naphthalene, phenanthrene, pyrene and benz [a]anthracene were used as model compounds of alkylaromatic, naphthenic-aromatic and polyaromatic hydrocarbons which are present in VGO and residual feedstocks in the FCC process. The catalyst was used in its fresh and equilibrium forms at 450 ºC in a CREC Riser Simulator reactor with reaction times from 2 to 6 s. Thermal cracking reactions overwhelm the catalytic conversion of naphthenic-aromatic compounds such as fluorene and 9,10-dihydrophenanthrene. Under the same conditions, the fresh catalyst was more active than the equilibrium catalyst. The alkylaromatic, naphthenicaromatic and polyaromatic hydrocarbons, showed catalytic conversions which increased, CORRESPONDING AUTOR *were relatively stable and decreased, respectively, as a function of reaction time. The distribution of products suggested that most important reactions were thermal dehydrogenation, hydrogen transfer, ring opening, cracking and condensation. It was shown that all the model compounds are cracked, yielding particularly benzene in the gasoline range and coke.

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“…Outros trabalhos podem ser destacados na aplicação de SFC na análise de derivados pesados de combustíveis fósseis. Satou et al 46 usaram GC e SFC para simular uma curva de distribuição de hidrocarbonetos poliaromáticos de óleos pesados, encontrando uma faixa de distribuição mais ampla no segundo. Albuquerque 47 apresentou um método analítico validado para determinação total de dienos conjugados em produtos de petróleo, usando SFC como um bom exemplo de sua aplicação em análises de interesse na indústria petrolífera.…”

Section: Combustíveis Fósseisunclassified

Fluidos supercríticos em química analítica. III.: aplicações

Carrilho¹,

Tavares²,

Lanças³

2006

Quím. Nova

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Recebido em 13/4/05;aceito em 19/7/05; publicado na web em 16/2/06 SUPERCRITICAL FLUIDS IN ANALYTICAL CHEMISTRY III. SUPERCRITICAL FLUID CHROMATOGRAPHY: APPLICATIONS. The first two papers in this series described the basic theory involved in supercritical fluid chromatography (SFC), how the technique evolved from gas and liquid chromatography and how the instrumentation was developed. Over the last two years, a commercial, dedicated packed-column SFC/MS instrument appeared on the market. The SFC continues to grow in use, with fundamental developments, coupled with a steady rise in the number of industrial users and applications.

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Evaluation of ring size distribution in a heavy oil based on boiling point and molecular weight distributions

Cited by 11 publications

References 7 publications

Vacuum Pyrolysis of Hybrid Poplar Milled Wood Lignin with Fourier Transform-Ion Cyclotron Resonance Mass Spectrometry Analysis of Feedstock and Products for the Elucidation of Reaction Mechanisms

Vacuum Pyrolysis of Hybrid Poplar Milled Wood Lignin with Fourier Transform-Ion Cyclotron Resonance Mass Spectrometry Analysis of Feedstock and Products for the Elucidation of Reaction Mechanisms

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

Fluidos supercríticos em química analítica. III.: aplicações

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