Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1991-07-19
1993-08-17
Kunemund, Robert
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
423445, 4234492, 423DIG16, 502431, C09C 156
Patent
active
052366880
ABSTRACT:
Disclosed herein are a method for batchwisely calcining and activating infusibilized spherical pitch beads in an upper stage and a lower stage fluidized beds formed on respective perforated plates, by calcining the pitch beads in the upper stage at 600-800.degree. C. with a heated exhaust gas from a space for the lower stage, discharging activated carbon beads of the previous batch from the space for the lower stage, stopping the fluidization of the upper stage by guiding the exhaust gas from the space for the lower stage to the space for the upper stage through a bypass line so that the calcined beads can fall down to the space for the lower stage through the holes of the perforated plate of the upper stage, and activating the falling calcined beads at 800-1200.degree. C. while forming the lower stage fluidized bed with a heated calcining and activating gas, and a furnace used for the above method.
REFERENCES:
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patent: 4237107 (1980-12-01), Gillot et al.
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patent: 4696682 (1987-09-01), Hirai et al.
patent: 4970829 (1990-11-01), Hirai et al.
Ishihara Takao
Sakaguchi Yasuo
Watanabe Kunio
Kunemund Robert
Kureha Kagaku Kogyo Kabushiki Kaisha
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