by reducing the size of the exiting droplets conversely the reduced momentum that results directly from lower spray velocities is offset by the typical production of larger droplets where principally liquid stream exits the nozzles 39 the velocity of the vapor will typically in a range of from 30 to 75 ft sec the dispersion of the feed into yet finer droplets is promoted by imparting sufficient energy into the liquid where desired any of the prior art methods may be used in combination with the feed injection arrangement of this invention for example this invention may be practiced with some addition of a gaseous diluent such as steam to the feed before discharge through the orifices the addition of the gaseous material will aid in the atomization of the feed when employed the quantity of gaseous material typically combined with the feed before its discharge through the nozzles is equal to about 0 2 wt of the combined liquid and gaseous mixture atomization will for most liquids produce droplets in a size range of from 50 to 750 microns the additional energy and smaller droplet size associated with the use of the atomization gas will normally result in higher exit velocities from the nozzles such velocities may be up to 150 ft sec the nozzles 39 are retained by an extended shroud 59 that guides the ends of the nozzles at an inner face of the shroud that extends into conduit 13 the flange 29 forms the outer end of the shroud through which mixture conduits 61 and 63 extend flange 29 is a blind flange that is preferably bolted to a similarly open flange in conduit 13 to thereby facilitate insertion and removal of distributor 36 39 conduits 61 and 63 carry a combined mixture of.