Analysis of acids in high-boiling petroleum distillates

McKay, John F.; Cogswell, Thomas E.; Weber, James H.; Latham, D. R.

doi:10.1016/0016-2361(75)90029-0

Cited by 67 publications

(29 citation statements)

References 13 publications

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“…Samples were introduced into the ion sources of both mass spectrometers via all-glass inlet systems at temperatures of 300°-320° C. Data Analysis. Infrared spectra, reproduced in Reference 35, were qualita tively interpreted using compilations of vibrational frequencies for functional groups in organic substances (30,(38)(39)(40)(41)(42)(43). Calculation of functional-group concentrations using average extinction coefficients and average molecular weights (30,39,40,41) was not attempted.…”

Section: Methodsmentioning

confidence: 99%

Consequences of the Mass Spectrometric and Infrared Analysis of Oils and Asphaltenes for the Chemistry of Coal Liquefaction

Scheppele

Benson

Greenwood

et al. 1982

Advances in Chemistry

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Oils and asphaltenes are generally assumed to be key intermediates in coal liquefaction. Since fundamental chemical/ mathematical principles require compositionally unique fractions, mass spectrometry and infrared spectroscopy were employed to obtain detailed molecular analyses of fractionated coal-liquid-derived oils and asphaltenes. The asphaltenes contain higher molecular weight homologs in many specific-Z series and different compound types than do the oils. However, both fractions contain appreciable quantities of compound types equivalent in molecular formula and, hence, assumably in molecular structure. The chemical/physical properties of oils and asphaltenes are not describable in terms of average (hypothetical) molecular structures. The lack of unique oil and asphaltene compositions necessitates detailed molecular analysis as a prerequisite for understanding, assessing, and controlling the chemical/physical phenomena intrinsic to production and processing of coal liquids.T he concept of preasphaltenes, asphaltenes, and oils is of historical significance in the development of the science and technology of coal liquefaction (J). This concept is routinely employed in attempts to understand, assess,

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Section: Methodsmentioning

confidence: 99%

Consequences of the Mass Spectrometric and Infrared Analysis of Oils and Asphaltenes for the Chemistry of Coal Liquefaction

Scheppele

Benson

Greenwood

et al. 1982

Advances in Chemistry

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“…Figure 2 shows distillation conditions and fraction yields obtained from distillation of Cerro Negro, a Venezuelan [Green et al (1988) and Schwartz et al Green ( , 1988 Elemental Content ( w t . P) see Bunger, et al (1979), Green et al (1985a), Holmes and Thompson (19831, Ignasiak et al (1977) McKay et al (1975, 1976, 1981, and Rafii et al (1985) for example applications of the above methods. Whole neutrals are not amenable to most analysis methods;…”

Section: Liquid Chromatographic Separations Asmentioning

confidence: 94%

Liquid Chromatographic Separations as a Basis for Improving Asphalt Composition-Physical Property Correlations

Green

Reynolds

1989

Fuel Science and Technology International

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It is widely known that asphalts yielding similar re:;ults in standard tests like penetration may in fact exhibit significantly difEerent performance with respect to product manufacturing, application, or durability.Thus, a need exists for more definitive testing, especially with respect to defining the chemical composition of asphalt. Direct spectroscopic analysis of asphalt is diEEicult because of its compositional complexity, high degree of association between compounds present, and high. overall average molecular weight/boiling range.Hence, prior liquid chromatographic separation into compound classes or types can greatly enhance the level of information obtainable from spectroscopic methods, as well as provide information on types and quantities of compounds present. The scheme discussed involves initial separation into acid, base, and neutral types using Downloaded by [The University Of Melbourne Libraries] at 09:16 11 October 2014 1328 GREEN, REYNOLDS AND YUnonaqueous ion exchange chromatography, followed by subfractionation of each type into more discrete compound class fractions using a variety of normal phase high performance liquid chromatographic (HPLC) methods.Material recoveries on residual materials typically range from 95-105 weight percent. Details of the scheme, example applications, and results from analysis of fractions are discussed.

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“…Despite its versatility, the study of the intermolecular interactions of asphaltene has received little attention by using this technique. 32 In addition, the literature has been rarely cited about quantitative [32][33][34] and qualitative 35,36 analyses for the functional resolution of asphaltenes. The importance of FTIR studies not only to identify the existence and quantity of functional groups but also to provide further information such as the ratio of CH 2 to CH 3 and the relative amount of aliphatic and aromatic groups, which are essential criteria for crude oil.…”

Section: The Intermolecular Interactions Between Asphaltene and Dbsa Nesmentioning

confidence: 99%

Molecular structure characterization of asphaltene in the presence of inhibitors with nanoemulsions

Alhreez

Wen

2019

RSC Adv.

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Analysis of acids in high-boiling petroleum distillates

Cited by 67 publications

References 13 publications

Consequences of the Mass Spectrometric and Infrared Analysis of Oils and Asphaltenes for the Chemistry of Coal Liquefaction

Consequences of the Mass Spectrometric and Infrared Analysis of Oils and Asphaltenes for the Chemistry of Coal Liquefaction

Liquid Chromatographic Separations as a Basis for Improving Asphalt Composition-Physical Property Correlations

Molecular structure characterization of asphaltene in the presence of inhibitors with nanoemulsions

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