Characterization of phenols from coal liquefaction products by tin-119 nuclear magnetic resonance spectrometry

Rafii, E.; Faure, Robert; Lena, L.; Vincent, Émile-Jean; Metzger, Jacques

doi:10.1021/ac00291a024

Cited by 19 publications

(7 citation statements)

References 36 publications

(36 reference statements)

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“…By comparison, independent studies of keto-enolate equilibria " Nominal values of 600 (OH) and 280 (RCOOH) were assumed for t in the calculation of weight percent. 6 Gravimetric yield from nonaqueous ion-exchange LC separation. "Results from analysis of acid fractions are expressed on a whole distillate basis.…”

Section: Resultsmentioning

confidence: 99%

“…INTRODUCTION Sensitive and selective detection of sulfur compounds is of considerable interest in a number of widely diverse fields (1-3). Nearly as diverse are the methodologies and detectors reported (4)(5)(6)(7)(8)(9). By far the most widely used sulfur-selective detector is the flame photometric detector (FPD), which has been reviewed thoroughly by Farwell and Barinaga (10).…”

Section: Discussionmentioning

confidence: 99%

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Determination of total hydroxyls and carboxyls in petroleum and syncrudes after chemical derivatization by infrared spectroscopy

Yu¹,

Green²

1989

Anal. Chem.

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Oxygen-containing functional groups (hydroxyl and carboxyl) In fuels or crude oils, or fractions thereof, are determined by IR spectroscopy. The approach Is based on chemical derivatization followed by measurement of IR bands of the corresponding derivatives. The chemical derivatization procedure Involves two steps: (1) esterification of carboxylic acids with 2,2,2-trlfluoroethanol and (2) acylation of alcoholic and phenolic hydroxyls with trifluoroacetyl chloride. The aryl trlfluoroacetates absorb at 1800 cm'1; the 2,2,2-trlfluoroethyl esters absorb In the region 1760-1740 cm'1. Variation of molar absorptivity of the derivatives as a function of structure Is determined by using pure compounds and well-defined fractions from actual fuel samples. The overall accuracy, precision, sensitivity, and range of applicability to petroleum and related sample types are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Determination of total hydroxyls and carboxyls in petroleum and syncrudes after chemical derivatization by infrared spectroscopy

Yu¹,

Green²

1989

Anal. Chem.

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“…The weight percent phenolics reported herein were determined by extraction into a caustic aqueous solution. Approximately [10][11][12][13][14][15][16][17][18][19][20] g of a coal liquid was weighed and dissolved in 20-25 mL of benzene (or other solvent suitable for the compound class). The acidic compounds were then extracted from the organic layer into an aqueous layer containing 10% NaOH.…”

Section: Methodsmentioning

confidence: 99%

Determination of hydroxyl group concentration in coal liquids by phosphorus-31 NMR

Dadey¹,

Smith²,

Davis³

1988

Energy Fuels

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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: 99%

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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Characterization of phenols from coal liquefaction products by tin-119 nuclear magnetic resonance spectrometry

Cited by 19 publications

References 36 publications

Determination of total hydroxyls and carboxyls in petroleum and syncrudes after chemical derivatization by infrared spectroscopy

Determination of total hydroxyls and carboxyls in petroleum and syncrudes after chemical derivatization by infrared spectroscopy

Determination of hydroxyl group concentration in coal liquids by phosphorus-31 NMR

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

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