Results 71 to 80 of about 20,919 (276)

Dust evolution, a global view: I. Nano-particles, nascence, nitrogen and natural selection . . . joining the dots [PDF]

RSOS published 2016, 2021
The role and importance of nano-particles for interstellar chemistry and beyond is explored within the framework of The Heterogeneous dust Evolution Model at the IaS (THEMIS), focussing on their active surface chemistry (nascence), the effects of nitrogen doping and the natural selection of interesting nano-particle sub-structures. Nano-particle driven
arxiv  

Study of asphaltene dispersion and removal for high-asphaltene oil wells [PDF]

Petroleum Science, 2012
Many wellbores are blocked by asphaltene deposits, which lead to production problems in the oilfield development process. In this paper, methods such as elemental analysis, and solvent extraction are adopted for the study of wellbore blockages. The content of organic matter in blockages is higher than 96% and asphaltene is the main component of the ...
Qingzhe Jiang, Jixiang Guo, Chaogang Chen, Na An, Na An, Yangqiu Pan, Yaguang Li   +6 more
openaire   +2 more sources

Resonance‐induced restoration of rock permeability degraded by heavy components of crude oil

Deep Underground Science and Engineering, EarlyView.
Resonance‐induced changes occur in filtration properties of sedimentary rocks in crude paraffin oil flow under acoustic vibrations. Experimental data on (a) pressure drop; (b) permeability; (c) pressure at the rock inlet; and (d) pressure at the rock outlet are presented.
Evgenii Riabokon, Qian Yin, Mikhail Guzev, Mikhail Turbakov, Evgenii Kozhevnikov, Nadezhda Riabokon, Ivan Panteleev   +6 more
wiley   +1 more source

Chemical characterization of liquefaction products of an inertinite enriched northern Alaska coals [PDF]

, 1989
A Northern Alaskan coal rich in inertinites was further enriched by density gradient separations. The degree of condensation of the enriched coal was estimated to be low, mainly 3 ring.
Mayasandra, Venugopal
core  

Extracting the equation of state of lattice gases from Random Sequential Adsorption simulations by means of the Gibbs adsorption isotherm

, 2017
A novel approach for deriving the equation of state for a 2D lattice gas is proposed, based on arguments similar to those used in the derivation of the Langmuir-Szyszkowski equation of state for localized adsorption.
Darjani, Shaghayegh, Koplik, Joel, Pauchard, Vincent   +2 more
core   +1 more source

Far- and mid-infrared spectroscopy of complex organic matter of astrochemical interest: coal, heavy petroleum fractions, and asphaltenes [PDF]

, 2012
The coexistence of a large variety of molecular species (i.e., aromatic, cycloaliphatic and aliphatic) in several astrophysical environments suggests that unidentified IR emission (UIE) occurs from small solid particles containing a mix of aromatic and aliphatic structures (e.g., coal, petroleum, etc.), renewing the astronomical interest on this type ...
arxiv   +1 more source

Pre‐treatment with extraction solvent yields higher recovery: Method optimization for efficient determination of polycyclic aromatic hydrocarbons in organic‐rich fine‐textured wastes

Journal of Environmental Quality, EarlyView.
Abstract Fluid fine tailings (FFT) contain numerous organic compounds, including polycyclic aromatic hydrocarbons (PAHs). Growing concerns of PAH toxicity warrants monitoring for environmental consequences and natural attenuation. Conventional Soxhlet extraction yields low (∼50%–60%) recovery of PAHs (naphthalene, phenanthrene, pyrene, dibenzofuran ...
Henian Guo, Najmeh Samadi, Maryam Firoozbakht, Alsu Kuznetsova, Tariq Siddique   +4 more
wiley   +1 more source

Paraffin Blockage Specificsin Model Petroliferous Systems [PDF]

, 2014
In this paper we study the effect of the temperature factor, the content and composition of the dispersed phase components: paraffinic hydrocarbons, resins and asphaltenes, – on the sedimentation process in model systems.
Beshagina, Evgeniya Vladimirovna, Krutey, A. A., Loskutova, Y. V., Yudina, N. V.   +3 more
core   +1 more source

Ion Source Complementarity for Characterization of Complex Organic Mixtures Using Fourier Transform Mass Spectrometry: A Review

Mass Spectrometry Reviews, EarlyView.
ABSTRACT Complex organic mixtures are found in many areas of research, such as energy, environment, health, planetology, and cultural heritage, to name but a few. However, due to their complex chemical composition, which holds an extensive potential of information at the molecular level, their molecular characterization is challenging.
Charlotte Mase, Maxime Sueur, Hélène Lavanant, Christopher Paul Rüger, Pierre Giusti, Carlos Afonso   +5 more
wiley   +1 more source

A study of the combustion chemistry of petroleum and bio-fuel oil asphaltenes [PDF]

, 2016
The combustion of heavy fuel oils such as Bunker C and vacuum residual oil (VRO) are widely used for industrial applications such as furnaces, power generation and for large marine engines. There is also the possible use of bio-oils derived from biomass.
Atiku, FA, Bartle, KD, Jones, JM, Lea-Langton, AR, Williams, A   +4 more
core   +1 more source