Structural changes during visbreaking of light Arabian mix short residue: comparison of feed and product asphaltenes

Singh, I. D.; Kothiyal, Vimal; Kapoor, Mahendra P.; Ramaswamy, V.; Aloopwan, M. K. S.

doi:10.1016/0016-2361(93)90075-d

Cited by 15 publications

(9 citation statements)

References 12 publications

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“…Bozzano et al reported that the average molecular weight of a residual oil is strictly connected to the kinematic viscosity [24]. Singh et al [25] and Lababidi et al [26] reported that during thermal conversion asphaltenes reduce their molecular weight. The results reported by these researchers support the hypothesis that the lower 6.…”

Section: Relation Between Visbreaker Feedstock Properties and Vacuum mentioning

confidence: 98%

Dependence of visbroken residue viscosity and vacuum residue conversion in a commercial visbreaker unit on feedstock quality

Stratiev¹,

Nedelchev²,

Shishkova³

et al. 2015

Fuel Processing Technology

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Section: Relation Between Visbreaker Feedstock Properties and Vacuum mentioning

confidence: 98%

Dependence of visbroken residue viscosity and vacuum residue conversion in a commercial visbreaker unit on feedstock quality

Stratiev¹,

Nedelchev²,

Shishkova³

et al. 2015

Fuel Processing Technology

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“…Visbreaking involves free radical reactions including initiation, propagation, and termination steps (Raseev, 2003). The main reactions include side chain dealkylation, cracking of paraffinic chains, dehydrogenation, cyclization, aromatization, and condensation (Joshi et al, 2008;Singh et al, 1993). The extent of reaction depends on the process temperature, residence time, and chemical nature of the feedstock.…”

Section: Conversionmentioning

confidence: 99%

Viscosity of characterized visbroken heavy oils

Márquez

Schoeggl

Taylor

et al. 2020

Fuel

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The Expanded Fluid viscosity model was extended to visbroken heavy oils characterized into the following fractions: distillates and the residue SARA fractions (saturates, aromatics, resins and asphaltenes). To do so, a Western Canadian bitumen was visbroken at five different reaction conditions (temperature and residence time). Densities and viscosities were measured for each fraction and used to develop new property correlations based on conversion. The correlated fraction properties were then recombined to obtain the whole oil viscosity. The model matched the density and viscosity of all the visbroken oils in this dataset with average absolute deviations of 1.1 kg/m³ and 8%, respectively. The model successfully predicted the properties of a visbroken product from a chemically similar bitumen feedstock but not for those from a chemically dissimilar oil. This method is suitable for implementation in process simulators but is only recommended for whole oil feeds chemically similar to Western Canadian bitumen. This journey gave me the opportunity to meet and work with many remarkable people. First I would like to make a special acknowledgement to my supervisor, Dr. Harvey Yarranton, for the opportunity to be part of this amazing team. His teachings and guidance have significantly contributed in shaping the person I am today. You have my uttermost respect and admiration.I would like to extent my gratitude to Glen Hay and Shawn Taylor for all the time and feedback provided to guide this project in the right direction. I also want to recognize Florian Schoeggl and Elaine Baydak for all their support and teachings. I want to extend my gratitude to all the members of the HOPP research group, particularly to

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“…The reason for this must be related to the chemical structure. It has been reported that during the visbreaking process the molecular weight decreases by dealkylation, dehydrogenation and/or ring opening of naphthenic rings (Singh et al 1993). Side chains and naphthenic rings attached to an aromatic cluster may cause a steric hindrance so that aromatic clusters cannot come close together or so that PPA cannot fully interact or react with these structures.…”

Section: Discussionmentioning

confidence: 99%

The Interaction of Polyphosphoric Acid with Bituminous Binders

Soenen¹,

Heyrman²,

Lu³

et al. 2015

RILEM Bookseries

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The purpose of this study is to evaluate how different binders react with polyphosphoric acid (PPA), and to contribute to a better understanding of this interaction. A number of bituminous binders were characterized before and after adding PPA, using rheological and chemical test methods, including FT-IR, uv-vis spectroscopy, NMR and gel permeation chromatography. The interaction with PPA is quantified as the change in softening point after adding a specific percentage of PPA. Most bitumen show an increase in R&B. Also in rheology, the stiffness increases, while the phase angle decreases when adding PPA. These observations are well-known and have been reported frequently by other authors. However, for one of the binders, small amounts of PPA lead to a decrease in R&B and to an increase in penetration. Rheological tests on this binder confirmed that the complex modulus decreases after adding PPA. These effects could be attributed to a precipitation, induced by PPA. This is very clear when investigating a drop of the bitumen-PPA blend in an optical microscope, and is also confirmed by storage stability tests. In conclusion, the findings suggest that PPA interacts with conjugated aromatic compounds, and this can in some cases lead to a precipitation.

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Structural changes during visbreaking of light Arabian mix short residue: comparison of feed and product asphaltenes

Cited by 15 publications

References 12 publications

Dependence of visbroken residue viscosity and vacuum residue conversion in a commercial visbreaker unit on feedstock quality

Dependence of visbroken residue viscosity and vacuum residue conversion in a commercial visbreaker unit on feedstock quality

Viscosity of characterized visbroken heavy oils

The Interaction of Polyphosphoric Acid with Bituminous Binders

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