NOVELTY - A paraffin hydrocarbon-containing feed (1) is auto-thermally cracked with molecular oxygen-having gas (3) in contact with catalyst to produce product stream (10). Stream (10) is chilled and partially condensed to produce liquid streams (14) and uncondensed vapor stream. Stream(s) (14) are treated in demethanizer distillation column (15), deethyleneizer column (49) and 2C splitter (64), to produce overhead ethylene product stream (67) and bottom stream (68) comprising ethane, propylene and propane. Stream (68) is recycled to auto-thermal cracking process.    USE - For producing ethylene and optionally hydrogen from paraffin hydrocarbon-containing feed such as ethane, propane, butane, naphtha and gas oil.    ADVANTAGE - The purified ethylene product and optionally purified hydrogen product are efficiently recovered from effluent of auto-thermal cracker.    DETAILED DESCRIPTION - A paraffin hydrocarbon-containing feed (1) is auto-thermally cracked with a molecular oxygen-containing gas (3) in contact with a catalyst capable of supporting combustion beyond the normal fuel rich limit of flammability, to produce a product stream (10) comprising ethylene, ethane, propylene, carbon monoxide, hydrogen, and hydrocarbons heavier than propylene. The product stream (10) is chilled and partially condensed to produce one or more liquid streams (14) and an uncondensed vapor stream. At least one of the liquid streams (14) are treated in a demethanizer distillation column (15), to produce an overhead product (41) comprising hydrogen, carbon monoxide and methane, and a bottom product (46) comprising hydrocarbons heavier than methane. The bottom product (46) is treated in a deethyleneizer column (49) to produce an overhead product (53) comprising ethylene, ethane, propylene and propane and essentially free of 4C hydrocarbon, and bottom product comprising 4C and heavier hydrocarbons. The overhead product (53) is treated in 2C splitter (64) to produce overhead ethylene product stream (67) and bottom stream (68) comprising ethane, propylene and propane. The bottom stream (68) is recycled to auto-thermal cracking process. Thus, ethylene is manufactured from paraffin hydrocarbon-containing feed.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic block diagram of ethylene manufacturing apparatus.    Hydrocarbon feed (1)    Molecular oxygen-containing gas (3)    Product stream (10)    Liquid stream (14)    Demethanizer column (15)    Demethanizer column overhead product (41)    Demethanizer column bottom product (46)    Deethyleneizer column (49)    Deethyleneizer column overhead product (53)    Splitter (64)    Overhead ethylene product stream (67)    Splitter bottom stream (68)