New Activated Carbon Production Process from Scrap Tire Using Fluidizing Bed

Toshio OGATA*, Kensaku HARAGUCHI, Katsutoshi YAMADA, Masataka SASAMORI, Sougo SAYAMA, Yoshio SAKAI and Hidehiko INOUE††

Hokkaido National Industrial Research Institute; Toyohira-ku, Sapporo-shi 062-8517 Japan
Cold Region Technology Laboratory; Toyohira-ku, Sapporo-shi 062-0912 Japan
†† Scrap Tire Union Hokkaido; Numanohata, Tomakomai-shi 059-1364 Japan

A new activated carbon production process from scrap tire using a fluidizing bed was proposed. The apparatus used for the laboratory test was as follows; a reaction tube made of quartz was 30 mmφ×300 mm long and was set in a vertical electric furnace. On the distribution plate placed at the center of the reaction tube, a raw material mixture of 5 g of rubber tip with 2--4 mmφ and 10 g of sand with <1 mmφ was fed. The furnace was heated at 10 °C/min under N2 stream of 200 mL/min. Water of 1.2 mL/min was introduced to the stream at 600 °C. Activated carbon was produced at the reaction temperatures of 800--850 °C during reaction period in the range of 30--120 min. Medium sand mixing promoted the activation, and activated carbon with the BET surface area of 708 m2/g was obtaind. Additionally, from a TG test and a gas chromatogram it was found that thermal decomposition of tire is completed below 500 °C. The residual carbon was processed as the raw material for next activation process. A new activated carbon production process using a fluidizing bed was presented. This medium sand fluidizing bed consists of two stages: upper stage; decomposition, and lower stage; activation.

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