Feed injector

A process for injecting a petroleum feed into a reaction zone of a fluid catalytic cracking reactor which comprises:

• injecting the feed into the reaction zone through a feed injector for atomizing the feed, said injector comprising a conduit containing at least one inlet, at least one outlet and a passageway within said conduit connecting the inlet with the outlet, said passageway containing an orifice wherein the orifice has a general aspect ratio greater than 1.0 and a ratio of perimeter length-to-cross-sectional area greater than 1.5 relative to a perimeter-to-cross-sectional area ratio of a circular artifice of equivalent area, and the orifice includes at least one member protruding inwardly from the perimeter of the orifice.