Abstract: A feed nozzle assembly for co-currently introducing vapor and liquid into a reactor vessel which feed nozzle assembly includes: (a) an annular enclosure surrounding an annular feed conduit, (b) an atomizing vapor conduit surrounded by the annular feed conduit. The annular feed conduit includes a first portion having a first outlet and a second portion having a second outlet opposite the first outlet. The first outlet fluidly connects the first portion and the second portion. The second portion is lined with a non-metallic conduit. The second outlet of the annular feed conduit traverses the annular enclosure. The atomizing vapor conduit has an outlet end having one or more openings disposed upstream of the first outlet of the annular feed conduit.