Abstract
This paper describes the selection of sulfonation reagents and the optimum condition for sulfonation of asphalt.
The influence of the content of SO3, which was contained in sulfonation reagents, on the yield of char was investigated with the increasing rate of yield of char per unit weight of SO3.
It was recognized that the yield of char increased gradually with the content of SO3 and reached the maximum value at about 60-80wt.% SO3.
It was found that the utilization of 60wt.%-oleum was more effective for sulfona-tion after general consideration of the yield of char, its shapes, its hardness, freezing point of sulfonation reagents etc. Futhermore, the optimum condition to produce non-caking char by 60wt.%-oieum became evident after the detailed consideration of various conditions for sulfonation of asphalt which influenced on the yield of char or activated carbon.
