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Monday, July 27, 2020 | History

2 edition of Hydrogen bonding in asphaltenes and coal found in the catalog.

Hydrogen bonding in asphaltenes and coal

Norman C. Li

Hydrogen bonding in asphaltenes and coal

final report

by Norman C. Li

  • 358 Want to read
  • 14 Currently reading

Published by Dept. of Energy, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Hydrogen bonding.,
  • Asphalt.,
  • Coal.

  • Edition Notes

    StatementN. C. Li and K. C. Tewari ; prepared for the U.S. Department of Energy.
    SeriesTID ; 28507
    ContributionsTewari, K. C., United States. Dept. of Energy.
    The Physical Object
    Pagination25 p. :
    Number of Pages25
    ID Numbers
    Open LibraryOL15225836M

      Abstract. Hypothetical molecular structures of humic coal, sapropelic kerogens, and asphaltenes are described, including how they change with maturity and how they have been refined over the past 75 years with advances in characterization : Alan K. Burnham. The carbon% of coal, expressed as dry and mineral matter free basis, is in the range of about 65–95% and increases with coal rank, i.e., from lignite to anthracite, with the accompanying decrease of oxygen and hydrogen %. Coal also generally includes a small Cited by: 1.

    Comprehensive Compositional and Structural Comparison of Coal and Petroleum Asphaltenes Based on Extrography Fractionation Coupled with Fourier Transform Ion Cyclotron Resonance MS and MS/MS Analysis Author: Niles, Sydney F., Chacón-Patiño, Martha L., Smith, Donald F., Rodgers, Ryan P., Marshall, Alan G. Source. Asphaltenes, Heavy Oils, and Petroleomics | Oliver C. Mullins, Eric Y. Sheu, Ahmed Hammami, Alan G. Marshall | download | B–OK. Download books for free. Find booksMissing: Hydrogen bonding.

      Get the definition of hydrogen bond explanation of hydrogen bonding including intermolecular hydrogen bonding, intramolecular hydrogen bonding, effect of hydrogen boning on solubility and boiling Missing: asphaltenes. 1. Introduction Asphaltene is a fraction that tends to cause most of the issues during crude oil transport and refining. The molecular structure of asphaltenes is the least understood among all petroleum fractions. 1 The asphaltene aggregation and the formation of colloidal particles in crude oil can be attributed to a range of intermolecular interactions such as hydrogen-bonding, 2 aromatic.


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Hydrogen bonding in asphaltenes and coal by Norman C. Li Download PDF EPUB FB2

Get this from a library. Hydrogen bonding in asphaltenes and coal. [N C Li; K C Tewari; Duquesne University. Department of Chemistry.; United States. Department of Energy.]. Get this from a library. Hydrogen bonding in asphaltenes and coal: final report. [N C Li; K C Tewari; United States.

Department of Energy.]. Near-infrared (n.i.r.) and proton magnetic resonance (p.m.r.) studies are reported of hydrogen bonding between the hydroxyl group of o-phenylphenol (OPP) and two coal-derived asphaltenes, and their acid and base components.

The asphaltenes were isolated from two centrifuged liquid product (CLP) samples prepared from West Virginia, Ireland Mine bituminous coal under the same reaction Cited by: Asphaltenes dissolve in benzene because the hydrogen bond between the acid component (hydroxyl) and the π electrons on the benzene ring is stronger than that between acid and base components in asphaltenes.

When benzene is replaced by a nonpolar solvent (hexane), the solvent–solute hydrogen bond is too weak to solvate the acidic and basic components, so a larger Hydrogen bonding in asphaltenes and coal book is formed by solute–solute hydrogen bonding Cited by: However, previous infrared studies of hydrogen bonding in asphaltenes or coal have principally been concerned with the fact that hydrogen bonding occurs, rather than the elucidation of the types of structures or complexes present '7 ~ Cited by: Asphaltene supermolecules extracted from coal consist of highly condensed polyaromatic units and peripheral aliphatic chains, which is a natural source with high carbon content.

In this study, we demonstrate that the asphaltene can be used as an ideal supermolecular carbon precursor for the fabrication of carbon nanosheets by self-assembly via π–π and hydrogen bonding interactions with a Cited by: 9.

Other measurements with amine mixtures indicate that hydrogen bonding involving phenolic-OH and nitrogen bases gives rise to proton-transfer complexes, which partially accounts for the high viscosity and non-Newtonian flow of the coal liquids.

Hydrogen bonds range from the very strong, comparable with covalent bonds, to the very weak, comparable with van der Waals forces.

Most hydrogen bonds are weak attractions with a binding strength about one-tenth of that of a normal covalent bond. Nevertheless, they are very important. Without them, all wooden structures would collapse, cement would crumble, oceans would vaporize, 5/5(1).

@article{osti_, title = {Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, January--March }, author = {Yen, T. F.}, abstractNote = {The solubility limits of Synthoil and PAMCO asphaltenes have been measured as a function of Hildebrand solubility parameters and hydrogen bonding.

Solvents with moderate hydrogen bonding capacity such as. A hydrogen bond results when this strong partial positive charge attracts a lone pair of electrons on another atom, which becomes the hydrogen bond acceptor.

An electronegative atom such as fluorine, oxygen, or nitrogen is a hydrogen bond acceptor, regardless of whether it is bonded to a hydrogen atom or g: asphaltenes. An easy-to-read supplement to the often brief descriptions of hydrogen bonding found in most undergraduate chemistry and molecular biology textbooks, An Introduction to Hydrogen Bonding describes and discusses the current ideas concerning hydrogen bonding, ranging from the very strong to the very weak, with introductions to the experimental and Cited by: Five types of hydrogen bonds were found in coal and its extracts.

The hydroxyl groups in coal mainly exist as self-associated OH and OH−N hydrogen-bonded : Mohammad Nahid Siddiqui. The hydrogen bond formation between two flow improvers and asphaltene in heavy oil had been verified through infrared spectroscopy analysis results.

The simulation results demonstrated that the FI-5 and asphaltene tended to form the stronger hydrogen bonds interaction than FI-2 due to the higher molecular bond energy among : Hongping Quan, Langman Xing.

In an attempt to explain relative hydrogen bonding capabilities of asphaltenes, OH peak intensity of phenol and enthalpies of hydrogen bond formation were used in combination with the content of heteroatoms (N, O, and S) in asphaltenes. The OH peak intensity of phenol depends on the presence of acidic and basic moieties or functional groups on Cited by: Based on two hypotheses, the single reaction model is used to calculate kinetic parameters for decomposition of hydrogen bonds (except OH-π) in coal heated up to °C.

Barbour and Petersen (), from the infrared study of the hydrogen-bonding interaction of phenol with asphalts and asphalt fractions, showed that asphalts contain molecular systems exhibiting strong hydrogen-bonding basicity similar to coal-derived counterparts.

They found the bond enthalpies for the interaction to be in the range of 6–8 kcal/mol based on IR-frequency shift by: 4. Hydrogen Bonding covers the papers presented at the Symposium on Hydrogen Bonding, held at Ljubljana on July 29 to August 3, The book focuses on the developments, processes, approaches, methodologies, and reactions involved in hydrogen Edition: 1.

Hydrogen bonding, π-cation interactions, and charge-transfer between complexes are attributed as the responsible functions for asphaltene dissolution [64].

Junaki et al [65]. Junaki et al [ Structural Differences Between Asphaltenes Isolated from Petroleum and from Coal Liquid TEH FU YEN Chapter 4, DOI: /bach Publication Date (Print): January 1, It is hard to distinguish the type of hydrogen bonds formed by hydroxyl groups by normal FTIR methods because of the interference of water in samples.

In this work, a method is proposed for the clear observation of the types of hydrogen bonds by FTIR. The method involves the evaporation of water in a vacuum chamber with CaF2 windows (vacuum level, 4 × kPa) followed by in situ scanning of Cited by:.

Collectively, the results demonstrate the existence of archipelago structures in both coal and petroleum asphaltenes, along with polyoxygenated species with low aromaticity that behave like asphaltenes in terms of solubility, because they can establish stronger intermolecular forces such as hydrogen : Sydney F.

Niles, Martha L. Chacón-Patiño, Donald F. Smith, Ryan P. Rodgers, Alan G. Marshall.Solvents which are hydrogen bond acceptors show strongly enhanced solubility (coal swelling) which correlates with the strength of the hydrogen bond between the solvent and p-fluorophenol.IR and H-1 nuclear magnetic resonance results show that active hydrogen (H*) reacts with functional groups in the coal such as C=O, -C-O- and C=C, leading to the reduction of unsaturated bonds and.