Abstract: A reactor for producing carbon black comprising, in the following order from upstream to downstream, a) a combination combustion/reaction section, wherein the combustion/reaction section comprises at least one inlet for introducing a combustion feed and at least one inlet for introducing a carbonaceous feedstock, b) a choke section, wherein the choke section comprises at least one inlet for introducing a carbonaceous feedstock and wherein the choke section converges to a downstream end, c) a quench section, wherein the cross section of the quench section is equal to or larger than the downstream end of the choke section and smaller than the cross section of the combustion/reaction section, and d) a breeching section. Also disclosed is a method for producing carbon black. Further disclosed is a simplified carbon black plant for producing tread and/or carcass type carbon black.