Double venturi carbon black reactor system

A method for the production of carbon black in a reactor of the type having a reaction tunnel of generally circular cross-section and varying diameter, said tunnel including a combustion zone, a reaction zone and a quench zone in contiguous axial alignment, which method comprises the steps of:

• introducing a fluid fuel and oxidant gas into said combustion zone for combustion therein to produce hot combustion product gases;
• flowing said hot combustion product gases downstream from said combustion zone into said reaction zone;
• introducing hydrocarbon feedstock into said hot combustion product gases in said reaction zone for reaction therewith to produce carbon black;
• flowing said admixed hydrocarbon feedstock and combustion product gases downstream through said reaction zone;
• passing said admixed combustion product gases and feedstock through first and second venturi flow constrictions disposed in said reaction zone and spaced longitudinally from each other;
• flowing said combustion product gases, feedstock and carbon black into said quench zone;
• quenching the reactions in said quench zone with a quench fluid;
• and
• separating the carbon black product from off gases downstream from said quench zone.