Process for producing carbon black

Claim 1

IN A PROCESS FOR THE PRODUCTION OF CARCASS GRADES OF OIL FURNACE CARBON BLACK IN WHICH A CARBON BLACK FEEDSTOCK IS INTRODUCED AXIALLY INTO ONE END OF AN ELONGATE, SUBSTANTIALLY CYLINDRICAL, REFRACTORY LINED REACTOR OF SUBSTANTIALLY UNIFORM DIAMETER INTO A PRIMARY REACTION ZONE HEATED BY PRIMARY HOT COMBUSTION GASES FROM THE BURNING OF A HYDROCARBON GAS OR OTHER FUEL WITH AIR, SAID COMBUSTION GASES FLOWING IN LONGITUDINAL DOWNSTREAM FLOW, THE IMPROVEMENT WHICH COMPRISES: A. SUPPLYING SAID PRIMARY HOT COMBUSTION GASES IN AN AMOUNT OF ABOUT 3500-5200 BTU PER POUND OF SAID FEEDSTOCK; B. SUPPLYING SECONDARY HEAT TO SAID REACTOR AS A STREAM OR STREAMS OF SECONDARY COMBUSTION GASES INTRODUCED IN TANGENTIAL FLOW AT A POINT OR POINTS LOCATED AT DISTANCES DOWNSTREAM OF THE POINT OF INTRODUCTION OF SAID PRIMARY HEAT EQUAL TO ABOUT 6-14 TIMES THE INSIDE DIAMETER OF SAID REFRACTORY LINING, THE AMOUNT OF SAID SECONDARY HEAT BEING ABOUT 1000-2500 BTU PER POUND OF SAID FEEDSTOCK; C. THE RATIO OF THE QUANTITY OF SAID PRIMARY HEAT TO SAID SECONDARY HEAT BEING FROM ABOUT 2 TO ABOUT 4.