When petroleum residues are heat-treated at 350-500°C, mesophase spherules are formed in residues. For mesophase spherules are insoluble in organic solvents such as quinoline, those are separated from pitch matrix by solvent fractionation. Mesophase spherules separated are called “meso-carbon microbeads”
In order to investigate the influence of the characteristics of residue on those of the meso-carbon microbeads, the meso-carbon microbeads were made from 6 kinds of residues and were studied on the characteristics of them. The following results were obtained;
(1) The meso-carbon microbeads having high value of C/H (atomic ratio) are obtained from the raw residue having high value of C/H.
(2) The meso-carbon microbeads having high intensity of infrared absorption assigned to aliphatic C-H vibration are obtained from the raw residue having high intensity of the same infrared absorption.
(3) Palaffinic hydrocarbons of straight long side chain having carbon number from 8 to 20 are included in the meso-carbon microbeads made from the residue mainly consisting of aliphatic hydrocarbons.
(4) Graphitizability of the meso-carbon microbeads depends on its C/H ratio. When these meso-carbon microbeads are heat-treated at 2800°C, the thickness of crystallite layer (
Lc (002) ) of the meso-carbon micro beads made from the residue having high value of C/H ratio are larger than those from the residue having low value of C/H ratio. Graphitizability of the meso-carbon microbeads are similar to that of coke made from the same residue.
From these results, it is considered that characteristics of the meso-carbon microbeads are similar to those of raw residue from which meso-carbon microbeads are made.
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