Process of modifying furnace carbon black

Claim 1

A PROCESS FOR PREPARING A TREATED FURNACE CARBON BLACK HAVING PROPERTIES COMPARABLE TO THOSE OF CHANNEL PROCESS CARBON BLACK WHICH COMPRISES THERMALLY DECOMPOSING A HYDROCARBON IN A CARBON BLACK FURNACE UNDER CONDITIONS OF FREE FORMATION IN THE PRESENCE OF FROM 2 TO 10,000 PARTS BY WEIGHT PER MILLION PARTS BY WEIGHT OF CARBON BLACK PRODUCED OF AN ALKALI METAL HAVING AN ATOMIC NUMBER OF AT LEAST 19; PELLETING THE CARBON BLACK; PARTIALLY OXIDIZING THE PELLETED CARBON BLACK SO PRODUCED WITH AN OXYGEN-CONTAINING GAS STREAM AT A TEMPERATURE IN THE RANGE OF ABOUT 600 TO 1000*F. UNTIL DPG ABSORPTION VALUES FOR THE BLACK ARE IN THE RANGE OF ABOUT 15 TO 20 MICROQUIVALENTS PER GRAM; COOLING THE BLACK TO A TEMPERATURE BETWEEN ABOUT 100 AND 300* F.; AND PARTIALLY OXIDIZING THE BLACK WITH AN OZONE-CONTAINING GAS UNTIL THE DPG ABSORPTION VALUE OF THE BLACK IS IN THE RANGE OF ABOUT 40 TO 50 MICROEQUIVALENTS PER GRAM.