Carbon black reactor

Claim 1

In a carbon black reactor comprising: a. an essentially cylindrically shaped precombustion section confined by an upstream wall, a cylindrical wall and a downstream wall; b. in axial alignment and open communication with said precombustion section a reaction section having an upstream inlet opening in said downstream wall of smaller diameter than the diameter of said cylindrical wall; c. first conduit means attached to the reactor for the axial introduction of the hydrocarbon feed into the reactor; d. second conduit means attached to the precombustion section for the tangential introduction of hot combustion gases into the precombustion section; e. third conduit means for the withdrawal of carbon black-containing gas attached to the downstream end of the reaction section; the improvement comprising f. turbulence-creating protrusions attached to at least one of said upstream and downstream walls confining said precombustion section, said protrusions being arranged and shaped such as to at least partially destroy the inwardly spiraling boundary layer flow of the hot combustion gases that would exist without these protrusions and convert it into turbulent flow.