NOVELTY - Ethylene refinery system comprises a single pressure shell encasing an upper and lower regions, liquid collector, separator, passageway, and feed introduction mechanism. The upper region comprises an ethylene distributor rectifying section. The lower region comprises C2 distributor section and an ethylene distributor stripping section. The liquid collector flows downward through the ethylene distributor rectifying section.    USE - For recovering and partial purification of ethylene from feed steam(s) containing ethylene.    ADVANTAGE - The invention requires only one pressure vessel, foundation, and support structure using the design the invention. It results in a reduction in materials and installation costs compared with the prior art.    DETAILED DESCRIPTION - Ethylene refinery system comprises a single pressure shell encasing an upper and lower regions, liquid collector, separator, passageway, and feed introduction mechanism. The upper region comprises an ethylene distributor rectifying section. The lower region comprises C2 distributor section and an ethylene distributor stripping section. The liquid collector flows downward through the ethylene distributor rectifying section and transports the liquid separately to each of the C2 distributor sections and the ethylene distributor stripping section. The separator separates the C2 distributor section and the ethylene distributor stripping section. The separator prevents passage of liquid or vapor directly between them. The passageway permits the passage of vapor within the lower region into the upper region. The feed introduction mechanism introduces the feed stream into the C2 distributor section. The feed stream(s) comprises ethylene, ethane, component(s) lighter than ethylene, and optionally 3C and heavier components.    An INDEPENDENT CLAIM is included for recovering and partial purification of ethylene from feed stream(s) introduced into a distillation column pressure shell comprising introducing the feed stream into the C2 distributor section; providing a mechanism for introducing stripping vapor into the C2 distributor section; introducing up flowing vapors from the C2 distributor section and the ethylene distributor stripping section into the ethylene distributor rectifying section; providing a means for introducing stripping vapor into the ethylene distributor stripping section; introducing down flowing liquid from the ethylene distributor rectifying section into the C2 distributor section and the ethylene distributor stripping section; refluxing the ethylene distributor rectifying section; recovering a stream of ethylene, ethane and C3 components from the bottom of the C2 distributor section; recovering a stream of ethane and ethylene from the bottom of the ethylene distributor stripping section; and recovering a stream of ethylene and components lighter than ethylene from the overhead of the ethylene distributor rectifying section.    DESCRIPTION OF DRAWING(S) - The figure shows combination of two distillation functions into a single shell having dividing wall.    Stream (101, 103, 104)    Column (C101)    Exchanger (E104, E105)