The dried cracked gas is fed to a cold box for the removal of hydrogen and light hydrocarbons, while minimizing ethylene losses.Īt this point, condensates from the chilling train are fed to a series of separation columns. The compressed cracked gas is cooled and subsequently dried by molecular sieves that remove most of the water. After the third stage of compression, carbon dioxide and sulfur are removed from the cracked gas by caustic soda and water washes in a caustic scrubber. The compression of the cracked gas is performed across five stages. Cracked gas from the quench is then directed to compression and separation.Ĭompression and drying. The furnace outlet stream is subsequently fed to a water-based quench, to prevent further reactions and formation of undesirable byproducts.įrom a decanter downstream from the quench tower, heavies, condensed dilution steam, tar and coke are removed. Initially, an ethane-propane mixture is fed to furnaces in which, under high-severity conditions, it is cracked, forming ethylene, propylene and other byproducts. This process diagram shows an ethylene-production process via the cracking of an ethane-propane mixtureĬracking and quenching.
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