Relationship between the Structure of Coke as Revealed by X-ray (002) Diffraction Pattern and the Structural and Physical Analyses of the Raw Aromatic Heavy Oil Ends

Abstract

An attempt has been made to correlate the carbon structure of cokes with the chemical structure of their raw materials.
Detailed physical and structural analyses were carried out on the extractive fractions (pyridine soluble and n-hexane insolube) of a series of pitches which were mutually different in cracking conditions and raw materials. At the same time their coking products were analyzed in terms of X-ray intensity factor of "Imax/B" (see, Fig.1) from (002) diffration patterns.
An electronic computer simulation based on the above results led to a simplified equation which would predict the structural differences of product cokes from chemical structure of raw materials.
Calculated results by using the equation coincided well with the intensity factor "Imax/B" from observed X-ray (002) diffraction patterns (Table 3). Thus the characterization of coke structure became possible based on the physical data and structural analysis of the raw materials.