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Structures of insoluble carbon in tars and pitches
Author(s) -
Kremer Henry A.,
Cukier Samuel
Publication year - 1983
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1983.tb04596.x
Subject(s) - quinoline , scanning electron microscope , optical microscope , tar (computing) , filtration (mathematics) , materials science , acetone , distillation , microscope , solvent , chemical engineering , chemistry , chromatography , composite material , organic chemistry , optics , statistics , mathematics , physics , computer science , programming language , engineering
SUMMARY Primary or True QIs, and also the so‐called ‘dirt’ were separated from seven tar sources available in Canada from four different steel companies, by filtering hot tar solution of quinoline and other good solvents. After washing with quinoline and acetone and drying, the filter cake was examined under scanning electron microscope (SEM) and analysed for inorganic impurities by wave length and energy dispersive X‐ray spectrometers. A limited amount of work was carried out on a production pitch blend, utilizing optical microscopy. After the filtration process, the filtrates which represented the QI free tars were subjected to distillation at atmospheric pressure and various pitches were prepared with a softening point range of 70–100°C. The pitches were dissolved in quinoline and analysed for QIs. The small amount of QI from each pitch was extracted and dispersed with solvent onto a microscope slide. The samples then were subjected to SEM and in one case to optical microscope studies; the sizes and shapes of the QIs were determined and compared with the QIs originally found in the individual tars. Photographs have been taken during the scanning work to record findings which have been considered typical and demonstrative of the findings. In order to gather further information on the role of QI in tars and pitches, particle size distribution was determined of QI extracted from a tar and a production pitch by a Coulter Counter.