Ethylene oxide synthesis through to glycol

The full EO/MEG chain in one flowsheet, upstream of the standalone hydration example: ethylene and oxygen react over a silver catalyst to ethylene oxide (low per-pass ethylene conversion, ~10%, is realistic — high conversion pushes the competing total-combustion side reaction, which this model represents as a second reactor consuming a fixed share of the same ethylene at ~80% EO selectivity). A cooled flash condenses EO (and reaction water) from the unreacted ethylene/oxygen/CO2 vented for combustion-side purge; the condensed EO then hydrates with fresh water to MEG exactly as in the standalone hydration example. No ethylene/O2 recycle loop (an honest simplification — real plants recycle unreacted ethylene at high ratio).