Scalable Synthesis of Stable Hydrogen-Bonded Organic Framework for Efficient Hexafluoroethane Purification
Zhenyu Ji1,2, Yunzhe Zhou1, Rajamani Krishna3
1State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
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Developing stable, efficient and easily scalably-synthesized adsorbents for removal of hydrofluoroethanes to obtain high purity hexafluoroethane (C2F6) is of great importance to the electronics industry. Herein, we report a hydrogen-bonded organic framework (HOF-TDBB) which exhibits statically as well as dynamically preferential hydrofluoroethanes (CF3CH2F and CF3CHF2) adsorption and achieves efficient one-step C2F6 purification from CF3CH2F/CF3CHF2/C2F6 mixture. At 298 K, 11.7 mol kg-1 of high-purity C2F6 can be obtained by HOF-TDBB from 5/5/90 CF3CH2F/CF3CHF2/C2F6 mixture. Additionally, excellent stability endows HOF-TDBB with good separation ability under various harsh conditions. For example, the separation performance can be well maintained within the dozens of consecutive separation experiments. Even at 338 K, 5.7 mol kg-1 of pure C2F6 can also be collected. More importantly, this material can be rapidly synthesized with a large scale by simple rotary evaporation. Combined with excellent separation performance, high stability and scalable synthesis, HOF-TDBB has unlocked its great potential in this challenging industrial separation.
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