PROCESS FLOW DIAGRAM POLYETHYLENE

PROCESS FLOW DIAGRAM : POLYETHYLENE By: Cameron Shaw Daniel Couto Daniel LeClair Leigh Bedford Nicole Rich-Portelli Compressor: initial compression of ethylene feed to 1500 bar Hyper-compressor: compensates for pressure loss in recycle stream and outlet feeds to restore reactor inlet pressure to 2000 bar Reactor: Plug Flow Reactor (PFR) inside a cooling jacket T = 70C, P = 2000bar Separator: main source of pressure loss polymer solids fall to bottom and are sent to extruder unreacted ethylene recycled back to reactor PROCESS Overview PROCESS OVERVIEW Major safety concerns are around the plug flow reactor: Free radical polymerization of ethylene to POLYETHYLENE is a highly exothermic reaction Converts gaseous ethylene into viscous POLYETHYLENE melt Thus many constraints must be taken for a PROCESS that aims to be effective and safe: reactor temperature (prevent unideal and dangerous temperatures) reactor pressure (prevent pressure increases and decreases in reactor) flow rate in reactor (prevent unideal flow rates) HAZOP HAZOP LOW TEMPERATURE HAZOP HIGH TEMPERATURE HAZOP LOW PRESSURE HAZOP HIGH PRESSURE HA

Major safety concerns are around the plug flow reactor: Free radical polymerization of ethylene to polyethylene is a highly exothermic reaction Converts gaseous ethylene into viscous polyethylene melt Thus many constraints must be taken for a process that aims to be effective and safe: reactor temperature (prevent unideal and

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  Flows, Melt

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