Results 31 to 40 of about 22,701 (229)

Experimental measurement and modeling of asphaltene adsorption onto iron oxide and lime nanoparticles in the presence and absence of water

Scientific Reports, 2023
Asphaltene precipitation and its adsorption on different surfaces are challenging topics in the upstream and downstream of the oil industries and the environment.
Sajjad Ansari, Mohammad-Reza Mohammadi, Hamid Bahmaninia, Abdolhossein Hemmati-Sarapardeh, Mahin Schaffie, Saeid Norouzi-Apourvari, Mohammad Ranjbar   +6 more
doaj   +1 more source

EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS

Química Nova, 2021
Asphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS.
Hemmely Guilhermond de Souza Severino, Christiane Béatrice Duyck Pinto, André Luiz Durante Spigolon, Carlos Siqueira Bandeira de Mello, Tais Freitas da Silva, Kátia Zaccur Leal   +5 more
doaj   +1 more source

Modification Of Rheological Properties Of Asphalt Effect Of Addition Of Asphaltenes And Oxidized Asphaltenes On The Compatibility Of Asphalt- Sulfur Blends

مجلة بغداد للعلوم, 2014
This study is a complementary one to an extended series of research work that aims to produce a thermodynamiclly stable asphalt –sulfur blend. Asphalt was physically modified wiht different percentages of asphaltenes , oxidized asphaltenes and then ...
Baghdad Science Journal
doaj   +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

Characterisation of an algerian asphaltene by 1H and 13C CPMAS NMR, DEPT and ESI mass spectroscopy

Egyptian Journal of Petroleum, 2021
Quantitative liquid 1H and solid 13C CPMAS NMR spectroscopy were used in combination with qualitative DEPT (Distortionless Enhancement by Polarization Transfer) and liquid 13C NMR to investigate the molecular structural parameters of an Algerian ...
A.C. Djendara, Y. Bouhadda, T. Fergoug, M. Djabeur, A. Bellil   +4 more
doaj   +1 more source

Medium dependence of asphaltene agglomeration inhibitor efficiency

, 2007
Applying chemical additives (molecule inhibitors or dispersants) is one of the common ways to control asphaltene agglomeration and precipitation. However, it is not clear why at some conditions the synthetic flocculation inhibitors as well as resins not ...
Barcenas, Mariana, Buenrostro-Gonzalez, Eduardo, Duda, Yurko, Orea, Pedro, Zamudio-Rivera, Luis S.   +4 more
core   +1 more source

Understanding mechanisms of asphaltene adsorption from organic solvent on mica [PDF]

, 2014
The adsorption process of asphaltene onto molecularly smooth mica surfaces from toluene solutions of various concentrations (0.01-1 wt %) was studied using a surface forces apparatus (SFA).
Abudu A., Acevedo S., Acevedo S., Acevedo S., Adams J. J., Akbulut M., Alboudwarej H., Alvarez G., Alvarez G., Anand Natarajan, Andreatta G., Andrews A. B., Andrews A. B., Buckley J. S., Buckley J. S., Cussler E. L., David Harbottle, Drummond C., Dudasova D., Ekholm P., Faghihnejad A., Friberg S. E., Gonzalez G., Gonzalez G., Goual L., Hannisdal A., Hongbo Zeng, Horvath-Szabo G., Israelachvili J., Israelachvili J. N., Israelachvili J. N., Israelacvili J. N., Jacob Masliyah, Jiang T. M., Jiang T. M., Jouault N., Kawashima H., Kiran S. K., Kupai M. M., Labrador H., Marczewski A. W., Mikami Y., Mitchell D. L., Natalie Kuznicki, Natarajan A., Ostlund J. A., Rane J. P., Rane J. P., Sedghi M., Sjoblom J., Spiecker P. M., Taylor S. D., Vuillaume K., Wang J., Ward A. F. H., Wu X., Xie K., Yarranton H. W., Yen T. F., Zeng H., Zeng H., Zeng H., Zeng H., Zhang L. Y., Zhang L. Y., Zhenghe Xu   +65 more
core   +1 more source

Influence of pH on Oil-Water Interfacial Tension and Mass Transfer for Asphaltenes Model Oils. Comparison with Crude Oil Behavior

Oil & Gas Science and Technology, 2016
Asphaltenes are shown to be amphoteric, containing acidic and basic species that can ionize at low and high pH respectively when they come in contact with water.
Hutin Anthony, Argillier Jean-François, Langevin Dominique   +2 more
doaj   +1 more source

Pyrolysis of asphaltenes and biomarkers for the fingerprinting of the _Amoco Cadiz_ oil spill after 23 years [PDF]

, 2009
The chemical composition of the petroleum products accidently or deliberately released in the environment varies considerably with time under the action of biological (biodegradation) and physico-chemical (photo-oxidation) processes.
Fré, Jean Oudot
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