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- W2059005048 abstract "Among industrial chemical processes, ethylene oxide manufacture emits the largest amount of CO2 (∼2–3 million tons/yr), as byproduct from the burning of both the ethylene (feed) and ethylene oxide. Further, the conventional silver-based catalytic process presents safety challenges due to the formation of explosive ethylene oxide/O2 mixtures in the gas phase. By judicious choice of the catalyst (methyltrioxorhenium), oxidant (H2O2) and reaction medium (methanol/water), a homogeneous liquid phase catalytic system has been demonstrated that eliminates CO2 formation while producing ethylene oxide at >90% selectivity at near-ambient temperatures. Given its high volatility, the ethylene oxide is easily recovered from the reaction phase by distillation. The vicinity of the gaseous ethylene feed to its critical temperature (9 °C) is exploited to significantly increase its solubility in the liquid reaction phase by facile compression beyond the critical pressure of ethylene (∼50 bar). Since H2O2 is stable at typical reaction temperatures (40 °C or less), potentially explosive ethylene oxide/O2 mixtures are avoided in the gas phase. In addition to the potential of arresting the carbon footprint of a large-scale industrial process, the demonstrated process concept shows how gas-expanded liquids can be generally exploited in homogeneous catalysis to enhance productivity." @default.
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- W2059005048 date "2010-01-01" @default.
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- W2059005048 title "Toward a CO2-free ethylene oxide process: Homogeneous ethylene oxide in gas-expanded liquids" @default.
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- W2059005048 doi "https://doi.org/10.1016/j.ces.2009.02.008" @default.
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