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Synthesis of ethanol by CO 2  hydrogenation presents an efficient way to convert CO 2  into value-added fuels and chemicals. For practical applications, recycling unreacted tail gas as well as CO co-feeding plays a key role to enhance CO 2  conversion to ethanol. Thus, it is of great significance to study the effects of recycling unreacted tail gas and CO co-feeding on the chemical equilibrium. Herein, we perform a thermodynamic study to analyze the hydrogenation of CO 2  to ethanol using Aspen Plus. The effects of recycling tail gas and CO co-feeding on CO 2  conversion and ethanol selectivity at different temperatures and pressures are investigated. Both the optimal recycle ratio and CO/(CO + CO 2 ) ratio in the feed are found to enhance ethanol synthesis from CO 2  hydrogenation.

Thermodynamic analysis of ethanol synthesis by CO 2 hydrogenation using Aspen Plus: effects of tail gas recycling and CO co-feeding