Manufacturing Process of Activated Carbon from Asphalt (VI):Influence of Conditions for Producing Char on Activation Results

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Various chars which were obtained from sulfonation using sulfuric acid, oleum nd sulfuric anhydride were activated with steam under almost the same condition, and the influence of conditions to produce char on the yield and characteristics of activated carbon was investigated with these activated carbons. The possibility of the activation of char was influenced by the quantity of solvent and sulfonation reagent. The required quantity of sulfonation reagant reduced in order of the concentration of SO3; its quantity was the least in case of sulfuric anhydride and oleum followed this, and more quantity was required than the other two in case of sulfuric acid. Good quality char was obtained with less amount of sulfonation reagent in case of using every sulfonation reagents when the amount of solvent increased. The specific surface area and methylene blue adsorbability of activated carbon obtained were 1, 300-1, 600m2/g and 250-450mg/g respectively. Activated carbon obtained from char possessing large total ion exchange capacity had a large specific surface area and good adsorbability. Furtheremore, it was recognized that activated carbon possessing a large specific surface area and good adsorbability was obtained from char containing larger amount of carboxyl-and hydroxyl- groups than sulfonic groups.
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