steam was injected into inlets 13 26 and 31 at a total rate of about 50 kg hour current was maintained between 100 and 150 amperes which required between 150 and 450 volts when the carbon was removed from the apparatus through discharge system 34 at a rate of 50 kg of product per hour i found that the iodine number a s t m standard test method d 4607 of various samples ranged from 950 to 1000 and that the carbon tetrachloride activity a s t m standard test method d 3467 ranged from 60 to 63 these values are characteristic of an activated carbon that is suitable for a wide diversity of commercial applications also the narrow range in properties of separate samples indicates that a good homogeneity of the carbon was achieved by the apparatus and process of my invention a charge of a petroleum coke activated carbon that had been exhausted saturated by exposure to commercial kitchen exhaust vapors was introduced into the feed hopper 2 shown in fig1 the temperature in each of the three reaction sections 8 21 and 28 shown in the drawing was kept at 900 to 1000 u00b0 c and steam was injected into inlets 13 26 and 31 at a total rate of 50 kg hour current was maintained between 80 and 100 amperes which required between 150 and 450 volts as the carbon was discharged from the.