Manufacturing Process of Activated Cardon from Asphalt (VII):Repeated Use of Alkylhalide Solvent

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This report describes the possibility of the repeated use of alkylhalide solvents, namely 1, 1, 2-trichloroethane and perchloroethylene at the time when carbonized intermediate product prior to activation (for simplicity, char) is produced from the sulfonation of propane-deasphalted asphalt (for simplicity, PDA) with oleum.<BR>No influence of the repeated use of these solvents on the yield of char or activated carbon was recognized from the experimental results; they were very stable without damage or change in physical and chemical quality even after 20 times of repeated use along with oleum.<BR>However, the ease of the sulfonation of PDA with oleum in solvent and the acti-vation of char with steam varied with the kind of solvents, so that 1, 1, 2-trichloroethane was adopted as a solvent for the sulfonation of PDA with oleum to obtain more suitable char for activation.<BR>The recovery of solvent was always 98. 2'-98. 6wt.% because of distillation loss and the loss of solvent occluded in char. The concentration of acidic substances dissolving in recovered solvent was 1.0-1.5wt.% after first recovering, however, the accumulation of acidic substances was recognized only slightly after the repeated use of recovered solvents.
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