8 research outputs found
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United States Bureau of Mines Bulletin 636
From Introduction: "In connection with the overall research by the Bureau of Mines on the nature of coal and its products, and extensive investigation was conducted on the composition of the resins from pitch of low-temperature tar. The pitch resin is that material in pitch or tar that is insoluble in saturated hydrocarbon solvents. It varies in appearance from a dark brown semisolid to a black, granular solid.
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United States Bureau of Mines Reports
Report discussing an extensive characterization on the neutral oil components in a low-temperature bituminous coal tar. A total of 133 individual compounds was identified with respect to individual isomers and at least 55 other compounds were indicated to be present. Comparisons and descriptions of the compounds are presented
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United States Bureau of Mines Bulletin 591
From Summary and Introduction: "Descriptions are presented for the synthesis of authentic specimens of tar acids and tar bases. An appendix contains the ultraviolet and infrared spectra of 189 individual tar acids and tar bases.