High-resolution mass spectrometric investigation of Heteroatom Species in coal-carbonization products.
Shultz-JL; Kessler-T; Friedel-RA; Sharkey-AG Jr.
Proc ASTM Committee E-14 Mtg on Mass Spectrometry and Allied Topics 1968 May; :359-361
This investigation of the high-resolution mass spectra of coal-tar pitch and a concentrate containing the heteroatom species has resulted in the detection of approximately twice the number of structural types previously reported in the literature. Application of the high-resolution mass spectrometric technique in detecting changes in the concentration or composition of organic structures in complex mixtures has also been demonstrated by the studies of weathered road tars and coke-oven pitches. The concentration of organic structures containing oxygen increases more rapidly than other classes of organic compounds in tars weathered on road surfaces. Data obtained for polynuclear aromatic ring systems in two coke-oven pitches indicate that the degree of condensation as well as the average molecular weight and average number of rings per structural unit could be a factor in determining reactivity of pitches. The ratio of peri-condensed to cata-condensed aromatic hydrocarbons was 50 percent higher for the low-reactivity pitch than for the average-stability pitch investigated.
Coke ovens; Coal tar pitch; Mass spectrometry; Organic compounds; Chemical structure; Oxygen levels; Tars; Polycyclic aromatic hydrocarbons
Proc. ASTM Committee E-14 Mtg. on Mass Spectrometry and Allied Topics, May 1968, PP. 359-361