Manufacturing Process of Activated Carbon from Asphalt (III) Preparation of Char from Asphalt by Sulfuric Acid-Solvent Method

概要

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Propane-deasphalted asphalt (PDA) was sulfonated by sulfuric acid in presence of solvent to produce activated carbon from asphalt. Granulated char was obtained after sulfonation reaction by using solvent which belonged to one of alkylhalides such as methylenechloride, 1, 1, 2- trichloroethane or 1, 1, 2, 2-tetrachloroethane. The yield of char gradually increased with the increase of amount of solvent. This effect was recognized even in case of using small amount of solvent. It was clear that the yield of char was influenced considerably by the amount of sulfuric acid in the presence of solvent. The yield of char was about 10 wt. % higher in the presence of solvent than in the absence of it. Also, the total ion exchange capacity of char was larger in the presence of solvent.Therefore it was seen that the presence of solvent very much facilitated the sulfonation of PDA. The required amount of sulfuric acid was less in the presence of solvent than in the absence of it; the weight ratio of sulfuric acid to PDA for the former was 3 or 4, but 7 for the latter to obtain the char with the yield based on PDA of 120 wt. %.
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