Oxygen functions in asphaltenes

Moschopedis, Speros E.; Speight, James G.

doi:10.1016/0016-2361(76)90035-1

Cited by 82 publications

(29 citation statements)

References 4 publications

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“…These two bands indicate a very low concentration of OH and NH groups, which are responsible for asphaltenes aggregation through hydrogen bonding (Moschopedis and Speight, 1976). The very weak bands around 3,050 and 3,040 cm 1 result from C-H stretching in aromatic rings.…”

Section: Infrared Studiesmentioning

confidence: 98%

Characterization of Some Local Petroleum Residues by Spectroscopic Techniques

El-Bassoussi

Ahmed

Sayed

et al. 2010

Petroleum Science and Technology

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Two vacuum residues were delivered from two different petroleum refineries, one from Suez Petroleum Company and the second from Alexandria Petroleum Company. Two heavy residues were subjected to solvent extraction using n-pentane, n-heptane, and ethyl acetate. The studied residues were fractionated into their components. Infrared spectroscopy was applied to study the distribution of functional groups contained in samples and their components. Some ratios calculated from the peak heights of selected infrared bands allow for a better comparison. The UV-Vis spectroscopic technique was applied to the aromatic fraction to determine how much mono-, di-, and polyaromatics are present in the aromatic fraction. The monoaromatics represent the lowest constituent among the aromatics present, whereas the polyaromatics and diaromatics are predominantly present and form the major constituent.

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Section: Infrared Studiesmentioning

confidence: 98%

Characterization of Some Local Petroleum Residues by Spectroscopic Techniques

El-Bassoussi

Ahmed

Sayed

et al. 2010

Petroleum Science and Technology

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“…In addition, the resin constituents contain a variety of functional groups (Moschopedis and Speight, 1976b;Moschopedis and Speight, 1978) including thiophene, benzothiophene, and dibenzothiophene systems, hydrogenbonded hydroxyl groups, pyrrole (and indole) N-H functions, ester functions, acid functions, carbonyl (ketone or quinone) functions, and sulfur-oxygen functions.…”

Section: Structurementioning

confidence: 99%

Petroleum Asphaltenes - Part 1: Asphaltenes, Resins and the Structure of Petroleum

Speight¹

2004

Oil & Gas Science and Technology - Rev. IFP

397

293

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Résumé -Les asphaltènes, composés pétroliers. Partie 1 : Asphaltènes, résines et structure du pétrole -La définition précise des composés non volatils d'un pétrole (asphaltènes, résines, autres constituants plus spécifiques aux résidus et aux charges lourdes) constitue une donnée nécessaire aux opérateurs. Il est difficile de distinguer des espèces suivant de simples caractéristiques chimiques ou structurelles. Ceci est particulièrement valable pour les asphaltènes et les résines dont la procédure de séparation détermine non seulement le rendement mais aussi la qualité de la fraction. Par exemple, l'emploi de différents solvants influence considérablement le rendement. La technique appliquée entraîne ou non la présence de résines coprécipitées avec les asphaltènes. Ceci provient de la définition générale des asphaltènes et des résines, respectivement comme composés insolubles et solubles dans le n-pentane (ou le n-heptane). Les résultats de récentes études de structure contredisent les anciennes descriptions d'asphaltènes en tant que composés contenant de larges plages de noyaux aromatiques polycondensés et montrent qu'une grande diversité de fonctions chimiques jouent aussi un rôle dans le comportement des asphaltènes. Ainsi, la stabilité d'un pétrole peut-elle être représentée par un système de trois phases : les asphaltènes, la fraction aromatique (incluant les résines) et la fraction saturée, le tout se trouvant en équi-libre suivant une délicate harmonie. Plusieurs facteurs, tels que l'oxydation, peuvent altérer ce système, conduisant à une instabilité ou une incompatibilité des espèces due à la modification de leur polarité et de leurs liaisons. Abstract

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“…As an effort for using multielement trace metal data for fingerprinting and identifying crude oil residues, Zn, Co, Sc, Br, Cr and Sb were determined in beach asphalts (38). Choosing one sample as an arbitrary standard and ratioing the elements in other samples to that of the standard, it can be concluded that no two samples have all the six elements in the same ratio as the standard.…”

Section: Trace Elements In Petroleummentioning

confidence: 99%

“…I.N.A.A. has been applied for the determination of several elements in oil shale (40). Results, when possible, were compared to those obtained by X.R.F.…”

Section: Trace Elements In Petroleummentioning

confidence: 99%

“…However, the majority of the data relates to oxygen functions in blown (oxidized) asphalts and residua (36,37) which may actually be of little relevance to the oxygen functions in the native materials. Of the limited data available, there are indications that oxygen in asphaltenes can exist as non-hydrogen-bonded pheno1ic hydroxyl groups (38,39). Other information on the presence and nature of oxygen in asphaltenes has been derived from infrared spectroscopic examination of the products after interaction of the asphaltenes with acetic anhydride 8,40) and produced evidence for the presence of ketones and/or quinones as well as indications that a considerable portion of the hydroxyl groups present in asphaltenes may eX.ist as collections of two, or more, hydroxyl functions on the same aromatic ring, or on adjacent peripheral sites on a condensed ring system: OH OM (X) or even on sites adjacent to a carbonyl function in a condensed ring system: OH 0…”

Section: The Structure Of Petroleum Asphaltenes (A) the Carbon Skeletonmentioning

confidence: 99%

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Atomic and Nuclear Methods in Fossil Energy Research

Eilby¹,

Carpenter²,

Ragaini³

1982

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All rights reserved 81-21169 AACR2No part of this book may be reproduced , stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, microfilming, recording , or otherwise , without written permission from the Publisher v vi mass spectroscopy photoelectron spectroscopy gamma-ray spectroscopy radioactive tracer studies electron microprobe analysis nuclear magnetic resonance spectroscopy PREFACE These papers were arranged into sessions according to the following major problem areas:methods of elemental analysis investigations of mechanisms and structures characterization of speciesThe problem areas were keynoted by excellent plenary state-of-theart review papers given by J. W. Fruchter, well-known authorities in their fields. The contributed papers followed by presenting recent experimental results in those areas reviewed in the plenary papers.This conference provided an l!llusual opportunity for attendees with expertise and interests in the diverse areas of atomic analytical techniques and nuclear analytical techniques to communicate together and discuss topics of mutual interest. We feel these discussions were very fruitful and educational for all the attendees and will lead to beneficial collaborations in the future. , members of the Technical Committee.The editors would like to acknowledge the unselfish giving of time and talent of those whose help made this conference a success. We wish to express our added appreciation to the session chairmen for their overall contributions: PREFACE vii son of Washington State University. A special thanks is extended to S. Hendrickson of Lawrence,Livermore National Laboratory for the compilation and preparation of the abstracts.Although proper prearrangements are critical to any meeting, implementation is equally critical. For the invaluable on-site assistance we received during the various phases of the conference, we are indebted to many, but especially to K. B. Pedersen for arranging so much of the local assistance. We are indebeted specifically to the staff of the Center for Energy and Environment Research; S. E. Alemany, Chancellor, University of Puerto Rico -Mayaguez Campus; and M. Vargas-Cesani, Recinto Universitario de Mayaguez. We wish to express our appreciation to D. Bennett, C. Filby and N. Wogman for coordination of all the last minute crises, both before and during the meeting. Finally, we would like to thank R. E. Sinclair, Applied Physics Technology, for organizing the coffee breaks which were sponsored by Canberra, ORTEC, Nicolet, and Nuclear Data.The location of the conference, Mayaguez, Puerto Rico, not only provided an excellent secluded atmosphere for informal working groups to be formed, but also was an equally enjoyable and superb setting for those who accompanied the attendees. The location was surpassed only by the cordiality of the hosts, J. Guzman, H. J. Santiago, J. A. Petrillo and staff, at the Mayaguez Hilton, the conference hotel. Competing with scenery and cordiality of the hotel was the ex...

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Oxygen functions in asphaltenes

Cited by 82 publications

References 4 publications

Characterization of Some Local Petroleum Residues by Spectroscopic Techniques

Characterization of Some Local Petroleum Residues by Spectroscopic Techniques

Petroleum Asphaltenes - Part 1: Asphaltenes, Resins and the Structure of Petroleum

Atomic and Nuclear Methods in Fossil Energy Research

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