Abstract
From coal-tar-pitch, free carbon was separated by the extraction of solubl e mattersin toluene and glacial acetic asid. Free carbon (Residue B) was further separated into three fractions (B1, B2, B3) by the extraction with toluene and pyridine in autoclave . The procedure is shown in Table 1. The X-ray diffraction patterns of those fractions are as sumed to be the carbon-pattern, and the dimensions of crystallites were calculated (Table 3). The authors consider that “free carbon” is made of larger molecules of condensed-aromatic type of hydrocarbons, and the Residue B3 is most suitable fraction to be called as “carbon”.
