β Scribed by Philippe Chambrion; Ronald Bertau; Pierre Ehrburger
No coin nor oath required. For personal study only.
The miscibility of bitumen-coal tar mixtures has been investigated. Bitumen-coal tar mixtures containing 10 to 50wt% of coal tar were examined by differential scanning calorimetry and optical microscopy to determine the threshold of rniscibility. A solid-like precipitate was observed after blending bitumen with coal tar. Up to 20wt% of added coal tar, only one liquid-like phase was detected by both techniques, while a second phase appeared at higher contents of coal tar. The chemical composition of demixed phases was investigated using an FT-i.r. microprobe. This indicated that a new distribution takes place between aromatics and aliphatic-like compounds.
π SIMILAR VOLUMES
QI-free coal tar pitch is separated into a toluene-soluble (TS) and a toluene-insoluble (TI) fraction by solvent extraction. The effect of controlled mixing of both fractions on mesophase formation is studied. The formation of mesophase is correlated with the carbon and hydrogen contents of the samp