Abstract
It was found that the required quantity of sulfuric acid for producing non-caking char from asphalt, which had been determined empirically, could be determined quantitatively according to the shape of a thermobalance-curve of char and an asphaltene content in raw asphalt.
Namely, the quantity of sulfuric acid used so that the heating weight loss of char at 350-550°C in nitrogen atmosphere may become less than 28 wt. % was minimum required quantity of sulfuric acid for obtaining non-caking char from asphalt. Less sulfuric acid was needed than the minimum required quantity of sulfuric acid mentioned above to obtain non-caking char from asphalt of larger asphaltene content.
This experimental result enabled to produce char from asphalt, in which asphaltene content could be varied, so that the required quantity of sulfuric acid could be minimized.
