A RELATIONSHIP FOR THE EVALUATION OF COKING VALUES OF COAL-TAR PITCHES FROM THEIR PHYSICAL CHARACTERISTICS

A relationship has been proposed to evaluate the coking values of coal tar pitches from the knowledge of their three other characteristics, namely, softening point, benzene insolubles content and quinoline insolubles content. It has been tried on 44 self-prepared coal tar pitches and 18 others obtained from the literature, possessing widely-ranging characteristics, and is found to give coking values comparable to those obtained experimentally. The coefficients of correlation between the theoretical (obtained using the relationship) and experimentally determined coking values for the two lots of pitches have been calculated to be 0. 98 and 0. 94 respectively, which indicate an excellent validity of the proposed relationship for the evaluation of coking values of coal tar pitches.