Manufacturing Process of Activated Carbon from Asphalt (IX):Composition of Asphalt and Required Quantity of Sulfuric Acid for Producing Non-caking Char

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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.<BR>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.<BR>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.
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