Kinetic studies have been made on the formation of solvent insoluble matters in the pitch, which was prepared by the heat treatment of Murban and Gach Saran vacuum residues in the temperature range of 410-440°C.
The solvent extraction was carried out by use of n-Pentane, Benzene and Quinoline. The yields of four fractions of n-Pentane soluble (PS), n-Pentane insoluble/Benzene soluble (PI•BS), Benzene insoluble/Quinoline soluble (BI•QS), and Quinoline insoluble (QI) were measured in the course of the reaction.
Supposing that the reaction of forming insoluble matters proceed successively as follows, PS→k1PI•BS→k2BI•QS→k3QI, →k0Gas/Oil
it was found that the decomposition reaction (producing gas and oil) and the polymerization-condensation reaction (forming insoluble matters) are of the first order with respect to each fraction, except for the zero order reaction of QI formation.
The relationship between the average chemical structure and the rate of formation of solvent insoluble matters was discussed with the results of NMR and Molecular Weight measurement.
