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Efficient Purification of Ethylene from C<sub>2</sub> Hydrocarbons with an C<sub>2</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>2</sub>-Selective Metal–Organic Framework
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Citations
41
References
2020
Year
The separation of ethylene (C<sub>2</sub>H<sub>4</sub>) from C<sub>2</sub> hydrocarbons is considered as one of the most difficult and important processes in the petrochemical industry. Heat-driven cryogenic distillation is still widely used in the C<sub>2</sub> hydrocarbons separation realms, which is an energy intensive process and takes up immense space. In response to a greener, more energy-efficient sustainable development, we successfully synthesized a multifunction microporous Mg-based MOF [Mg<sub>2</sub>(TCPE)(μ<sub>2</sub>-OH<sub>2</sub>)(DMA)<sub>2</sub>]·solvents (<b>NUM-9</b>) with C<sub>2</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>2</sub> selectivity based on a physical adsorption mechanism, and with outstanding stability; especially, it is stable up to 500 °C under an air atmosphere. <b>NUM-9a</b> (activated <b>NUM-9</b>) shows good performances in the separation of C<sub>2</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>2</sub> from raw ethylene gases. In addition, its actual separation potential is also examined by IAST and dynamic column breakthrough experiments. GCMC calculation results indicate that the unique structure of <b>NUM-9a</b> is primarily conducive to the selective adsorption of C<sub>2</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>2</sub>. More importantly, compared with C<sub>2</sub>H<sub>4</sub>, <b>NUM-9a</b> prefers to selectively adsorb C<sub>2</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>2</sub> simultaneously, which makes <b>NUM-9a</b> as a sorbent have the capacity to separate C<sub>2</sub>H<sub>4</sub> from C<sub>2</sub> hydrocarbon mixtures under mild conditions through a greener and energy-efficient separation strategy.
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