Results 41 to 50 of about 20,919 (276)

Size distribution of primary submicron particles and larger aggregates in solvent induced asphaltene precipitation [PDF]

arXiv, 2022
Asphaltene precipitation is a crucial phase separation phenomenon in the oil industry, especially in paraffinic froth treatment to extract bitumen from oil sands ores. This work reveals the formation of particles at 0.2 to 0.4 um in radius, defined as a primary sub-micron particle (PSMP), which is ubiquitous from diffusive mixing between asphaltene ...
arxiv  

Molecular Interactions between a Biodegradable Demulsifier and Asphaltenes in an Organic Solvent [PDF]

, 2016
A surface forces apparatus (SFA) was used to measure the intermolecular forces between a biodegradable demulsifier (ethyl cellulose, EC) and asphaltenes immobilized individually on molecularly smooth mica surfaces in an organic solvent.
Harbottle, D, Kuznicki, N, Masliyah, J, Natarajan, A, Xu, Z, Zeng, H   +5 more
core   +1 more source

COOEE bitumen. Chemical aging [PDF]

J.Chem. Phys. 139, 124506 (2013), 2013
We study chemical aging in "COOEE bitumen" using molecular dynamic simulations. This model bitumen is composed of four realistic molecule types: saturated hydrocarbon, resinous oil, resin, and asphaltene. The aging reaction is modelled by the chemical reaction: "2 resins $\rightarrow$ 1 asphaltene".
arxiv   +1 more source

Thermal Conversion of Heavy Oil Systems and Analysis of Structural Changes of their High Components with PMR Method [PDF]

, 2014
Heavy oil systems are thermolyzed with different ratios of amount of resins and asphaltenes: 3.4, 3.8, 5.3, and 12.4. The change in yield and composition of gaseous, liquid and solid products of thermolysis is shown depending on the ratio of the resin ...
Golovko, A. K., Korneev, Dmitriy Sergeevich, Levashova, Albina Ivanovna, Pevneva, G. C.   +3 more
core   +1 more source

Investigation of the fluid behavior of asphaltenes and toluene insolubles by high-temperature proton nuclear magnetic resonance and rheometry and their application to visbreaking [PDF]

, 2016
The fluid behavior of asphaltenes at elevated temperatures impacts coke formation in a number of hydrocarbon conversion processes, including visbreaking and delayed coking. In this study, the asphaltenes from a number of sources, namely, a vacuum residue,
Barker, James, Castro-Díaz, M., Cheeseman, Barry, Snape, C.E., Uguna, Clement N.   +4 more
core   +3 more sources

Aggregation and coagulation of asphaltenes in oil film: physical characteristics of surface deposit products

Известия Томского политехнического университета: Инжиниринг георесурсов, 2017
The relevance of the discussed issue is caused by the practical significance of studying aggregation of asphaltenes in oil film and determining the dimensional parameters of micro- and nanostructures of the deposited components.
Yuriy Vladimirovich Korzhov, Sergey Anatolievich Orlov   +1 more
doaj   +2 more sources

Compatibility Assessment of Crude Oil Blends Using Different Methods

Chemical Engineering Transactions, 2017
Today, opportunity crude oils and their blends have attracted the attention of oil companies looking to increase their cross refinery margin. However, when crude oils are blended in the wrong proportions or even the wrong order, they can precipitate ...
M.A.M. Ben Mahmoud, A. Aboujadeed
doaj   +1 more source

Demulsification mechanism of asphaltene-stabilized water-in-oil emulsions by a polymeric ethylene oxide-propylene oxide demulsifier [PDF]

, 2014
The demulsification mechanism of asphaltene-stabilized water-in-toluene emulsions by an ethylene-oxide-propylene oxide (EO-PO) based polymeric demulsifier was studied.
Abdel-Azim A., Ancheyta J., Andersen S. I., Angle C. W., Angle C. W., Aveyard R., Barnes T. J., Bosio V., Cadena-Nava R. D., Czarnecki J., Czarnecki J., David Harbottle, Dickinson E., Dimitrov A. N., Ekott E. J., Erica Pensini, Erni P., Erni P., Ese M.-H., Fan Y., Fan Y., Fan Yang, Feng X., Feng X., Feng X., Ferri J. K., Ferri J. K., Gao S., Harbottle D., Hou J., Hua Y., Ishpinder Kailey, Jacob Masliyah, Jacqueline Behles, Kailey I., Kailey I. K., Kim Y. H., Kotsmár C., Kupai M. M., Lobato M. D., McLean J. D., Mohammed R. A., Mohammed R. A., Mohammed R. A., Pensini E., Petkov J. T., Plamen Tchoukov, Ramakers R. R. M., Ramalho J. B., Robins M. M., Singh B. P., Speight J. G., Spiecker P. M., Stewart A. C., Sun H.-Q., Tchoukov P., Tchoukov P., Vieira J. B., Wang Y., Wu J., Wu J., Xu Y., Yan Z., Yang X., Yanru F., Zaki N., Zhang H., Zhang L. Y., Zhang L. Y., Zhang L. Y., Zhang Z., Zhenghe Xu, Zifu Li, Álvarez L.   +73 more
core   +1 more source

Fines deposition during hydrotreating: Effects of catalyst size and bed arrangement

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Fines deposition presents a significant problem during the hydrotreating of bitumen‐derived gas oils. The accumulation of fines leads to reactor clogging and consequently, pressure drop buildup. At critical levels, the hydrotreating reactor must be prematurely shutdown, resulting in substantial economic losses for refineries.
Simon Kwao, Sundaramurthy Vedachalam, Ajay K. Dalai, John Adjaye   +3 more
wiley   +1 more source

Aggregation of model asphaltenes – a molecular dynamics study [PDF]

, 2016
Natural asphaltenes are defined as polyaromatic compounds whose chemical composition and structure is dependent on its geological origin and production history, hence are regarded as complex molecules with aromatic cores and aliphatic tails that occur in
Costa, J L L F S, Mulheran, P A, Simionesie, D, Zhang, Z J   +3 more
core   +2 more sources