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The typical processes and characteristics of the three major ethylene production methods are as follows: 1) Lummus uses a tubular furnace steam cracking and sequential separation process, that is, a process that begins with demethanization. Lummus has successfully developed the highly selective SRT-VI type reactor, as well as binary and ternary refrigeration and catalytic distillation hydrogenation technologies. It has also collaborated with Sinopec to develop low-pressure quenching and pre-depropanization pre-hydrogenation processes. 2) Linde uses a separation process of steam cracking in a tubular furnace and pre-hydrogenation prior to deethanization. Linde is currently developing pyrolysis furnace tubes with anti-coking coatings applied to their inner sides (not yet industrialized), burners that inject air and fuel in a staged manner, as well as furnace structures featuring dual radiation sections. 3) TechnipFMC (Desitinub) uses a tubular furnace steam cracking and pre-depropanization with pre-hydrogenation separation process. TechnipFMC employs pre-depropanization and pre-hydrogenation, along with ARS or HRS technologies in separation processes, which achieve significant energy savings. The Maoming 1# Light Hydrocarbons Utilization Unit and CNOOC Shell South China Sea Ethylene Plant utilize respectively TechnipFMC’s ARS technology and its improved version (now HRS).