Patent ID: 6548036
Filing Date: 2003-04-15
Classification: C01P,C09C

Abstract:
A process for producing carbon black in a carbon black furnace reactor comprising:generating a combustion gas steam by reacting a fuel and an oxidant; introducing a carbon black-yielding feedstock into the combustion gas stream at a point located in a zone of the reactor having a diameter, D; introducing steam into the combustion gas stream in a first zone of the reactor having a first diameter and at a point located a distance, L, from the point of feedstock introduction such that the ratio of L/D ranges from 0 to less than 1.0, and in an amount such that, after allowing reaction of the feedstock, steam and combustion gas stream, carbon black is produced having a lower nitrogen specific surface area than carbon black made under the same conditions but in the absence of steam; reacting the feedstock, steam and combustion gas stream to form carbon black in a second lone of the reactor having a diameter that is greater than said first diameter; and cooling, separating and recovering the carbon black.