Abstract
The low temperature carbonization of various kind of virgin reduced crudes and cracked residues was studied by use of NMR, IR and elementaly analysis method. The samples heat-treated were treated with benzene and quinoline and separated, into the following three fractions: benzene solubles (BS), benzene insolubles (BI) and quinoline insolubles (QI).
The structural parameters obtained by Brown-Ladners8 and Yen's20) method were presented for each fraction.
1) The aromaticity of each fraction for the cracked residues heat-treated is higher than that of the virgin reduced crudes (Figs. 2, 5). The difference between the two becomes smaller as heat-treatment is continued on.
2) The fact that aromaticity of the mesophase formed from the virgin reduced crudes is very low indicates that substantial quantities of aliphatic substituents remain in the mesophase whose major components are aromatic condensed rings (Fig. 5).
3) It seems certain that chemical constituents of mesophase are nearly the same as to those β-resine, which is the precursor of mesophase (Figs. 8, 9).
4) The aromaticity of the mesophase formed from cracked residues is similar to that of matrix, which is the parent phase of mesophase transformation. But in the case of the virgin reduced crudes, the increase in aromaticity is one of the important changes that take place during the mesophase transformation (Fig. 10).
