The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Jul. 19, 1991
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
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.