Quinoline insolubles material

Figure 8. Boundaries of mosaic units in semicoke as re vealed by quinoline-insoluble material X 189...

During the heating of the coal-oil mixture, decomposition of the coal occurs, as evidenced by an increase in the proportion of quinoline-insoluble material. 

The specification requirements for electrode binder pitch, eg, high C/H ratio, high coking value, and high P-resin content, effectively ruled out pitches from gasworks or low temperature tars. The cmde tar is distilled to a medium-soft pitch residue and then hardened by heating for several hours at 385—400°C. This treatment increases the toluene-insoluble content and produces only a slight increase in the quinoline-insoluble (Ql) material, the latter by the formation of mesophase. 

It is my contention that the optical and physical properties and the optical structure produced during the destructive distillation or thermal decomposition of vitrinite is closely related to mode of carbonization and, in the case of pitch, is intimately related to the method of pitch preparation. For instance, a pitch may be produced from a high or low temperature tar, from a primary cooler tar, or from a flushing liquor tar. In addition, it may be air blown, thermally or chemically treated, straight distilled, or cut back, just to mention a few. Under similar carbonization conditions almost any one of these pitches will produce a coke which has certain characteristics that are related to the parent pitch. Even pitches similarly processed from the tar can differ in the content of quinoline- and benzene-insoluble material and P-resin, and can contain more than one distinct liquid phase. None of these points of difference has been discussed by Dr. Taylor or even recognized in the preparation. To interpret the structure of pitch coke divorced from a knowledge of the pitch source and/or carbonization conditions can lead to erroneous conclusions. These are pertinent data omitted by the authors. 

Phenoxatellurin1 A mixture of 1.0 g (2.9 mmol) of 2-carboxyphenoxatellurin, a little copper-bronze, and 30 ml of dry quinoline is heated under reflux for 1 h. The mixture is cooled to 20° and poured into dilute acetic acid. The precipitate is filtered, washed with dilute acetic acid, then with water, and the solid is extracted with aqueous sodium carbonate solution. The insoluble material is recrystallized twice from light petroleum ether yield 0.2 g (23%) m.p. 77 19°. 

The liquid phase carbonization process can be categorized on the basis of the starting material alkane hydrocarbon, alkene hydrocarbon, aromatic hydrocarbon, and PAH. Consequently, the primary material for MCMBs typically contains a large amount of PAHs from coal pitch and heavy oil. Components in primary materials, such as pyridine insolubles (Pis), quinoline insolubles (QIs), and other additives, and reaction conditions affect the growth, formation, and structure of MCMBs. 

Coal-Tar Pitch Coke. Coal-tar pitch is used to produce needle coke primarily in Japan. Processes for producing needle coke from pitch have also been developed in Germany (4). The key to producing needle coke from coal tar or coal-tar pitch is the removal of the high concentrations of infusible sohds, or material insoluble in quinoline (QI), which are present in the original tar. The QI inhibits the growth of mesophase and results in an isotropic, high CTE coke from coal-tar pitch. After removal of the QI, very anisotropic and low CTE cokes are obtained from coal-tar-based materials. 

Industrial pitch often contains components which are insoluble in quinoline, i, e. QI material. This QI material can conveniently be... 

The tarry material apparently consists of quinoline salts and some insoluble polymers. 

Recovery and Analysis of Pyrolysis Products. Frequently the quality of electrode binder pitches is assessed partially on the basis of how much material they contain that is insoluble in benzene (BI) and quinoline (QI) (8,9,10). In addition, the pyrolysis and coking of... 

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