Solubility and susceptibility of carbonaceous quinoline-insoluble substances including mesophase material in the co-carbonization process

Abstract

The solubility and susceptibility of carbonaceous quinoline-insoluble substances (QI) including mesophase material were studied in co-carbonizations with pitch-based materials by evaluating the homogeneity and the size of the anisotropic optical texture in resultant cokes. The efficacy of co-carbonization is attributed to the nature of both the Ql substance and pitch-based materials. The order of the modifying ability of the partner is CP-BS<KP-BS<A240<H-A240 and may be related to H/C ratios, fa values and Rnus (number of naphthenic rings per structural unit)/Rtus (number of total rings per structural unit). The hydrogen donating ability of the pitch material may be the most important property able to modify the non-fusible QI. The order of ability to be modified of the QI substances (susceptibilty) is KPQI-EtBS>soft mesophase>hard mesophase>KPQI. These abilities appear to be related to their fusibility and dependent upon their chemical structure defined by their origin and heat-treatment history. The molecular weight (extent of condensation) and the hydrogen content (favourably naphthenic hydrogen) of the components may be the most important factors. This approval is relevant to the preparation of suitable carbon fiber precursors from Ql material including mesophase.