Analysis of Coal Tar Pitches

An electrode‐binder coal‐tar pitch containing mesophase and resulting from combined mild thermal treatment under nitrogen and hot filtration (to remove ash, etc.) has been examined by solvent analysis and magnetic resonance (high‐resolution 1H‐nuclear‐magnetic and electron‐spin resonance) spectroscopy, X‐ray diffraction and polarised light microscopy. At ambient temperature, residues and filtrates with higher mesophase contents tend to exhibit higher concentrations of unpaired electrons and higher stacks in crystalline regions. Room‐temperature 100 MHz 1H‐n.m.r. spectra of solvent extracts of the treated pitch fractions confirm the predominance of aromatic over aliphatic hydrogen in all samples; heat‐treated samples have lower content of hydrogen α to the rings but greater amounts of methylene and methyl hydrogen more remote from the rings than before the heat treatment.

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Characterisation of pitch by HPLC

Martín

Garcı́a

Solé

et al. 1998

Chromatographia

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SummaryA new high performance liquid chromatography method for the characterisation of toluene-soluble fractions of pitches has been developed. Although a chromatographic system typical of size exclusion chromatography was used, results indicate that, for these structurally complex samples, separation does not follow the usual discrimination by molecular size. A differentiation between several classes of polyaromatic hydrocarbons is achieved instead. Data are reported on the analysis of individual standard polyaromatic hydrocarbons, showing that four different elution ranges can be observed: three of cata-condensed compounds (Catal, Cata2 and Cata3) and one of peri-condensed compounds (Peri). Results are reported proving the capacity of this high performance liquid chromatography method to distinguish between pitches of different origin and nature. It is also effective for the study of the chemical reactions occurring during heat treatment.

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Analysis of Coal Tar Pitches

Cited by 3 publications

References 14 publications

Mesophase from electrode-binder coal-tar pitch: An appraisal of structural techniques

Mesophase from electrode-binder coal-tar pitch: An appraisal of structural techniques

Mesophase from electrode‐binder coal‐tar pitch: An appraisal of structural techniques

Characterisation of pitch by HPLC

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