厳選されたエタン/エチレン分離は,堅固な微孔な水素結合の有機枠で
Xu Zhang1,2, Libo Li3,4, Jia-Xin Wang1
1State Key Laboratory of Silicon Materials, School of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
Journal of the American Chemical Society
|December 17, 2019
まとめ
新しい水素結合有機枠 (HOF),HOF-76aはエタンをエチレンから効率的に分離します. この吸着剤は,工業用途の高純度エチレンを生産するための有望な解決策です.
科学分野:
- 材料科学
- 化学工学
- 吸収科学
背景:
- エタン (C2H6) とエチレン (C2H4) の分離は,ポリマーグレードのエチレン生産に不可欠です.
- 水素結合有機フレームワーク (HOF) を使用したC2H6/C2H4分離のための既存の方法は,弱い水素結合相互作用のために制限されています.
- 選択的なC2H6/C2H4分離のための堅固な吸着剤の開発は,依然として重要な課題です.
研究 の 目的:
- 選択的なエタン/エチレン分離のための新しい,超堅固な水素結合有機フレームワーク (HOF-76a) を報告する.
- HOF-76aにおけるC2H4よりもC2H6の優先結合を制御する吸収機構を調査する.
- ポリマーグレードのエチレンの生産におけるHOF-76aの実用的な応用を示す.
主な方法:
- 新型HOF吸着剤 (HOF-76a) の合成と特徴付け
- 様々な圧力や温度でガスの吸収同熱を測定する.
- 吸収相互作用を理解するための理論的計算 (例えば,密度関数理論).
- 混合物の吸収予測のための理想的吸収溶液理論 (IAST) の計算.
- シミュレーションと実験の突破曲線分析
主要な成果:
- HOF-76aは,高いBrunauer-Emmett-Teller (BET) 表面積 (>1100 m2/g) を表している.
- HOF-76aは,C2H4よりもC2H6の好ましい吸収を示し,非常に選択的な分離につながります.
- 理論的な研究は,HOF-76aの非極性表面と三角形の孔構造が,より強いヴァン・デル・ワールスの相互作用によってC2H6の吸収を促進することを明らかにしています.
- 突破的な実験で,単一の吸収サイクルで50/50のC2H6/C2H4混合物からポリマーグレードのエチレンが成功しました.
- 7.2L/kg (1.01バー) と18.8L/kg (5.0バー) の高い生産性が達成された.
結論:
- HOF-76aは,効率的かつ選択的なC2H6/C2H4分離のための基準アドソーベンツです.
- HOF-76aのユニークな孔構造と表面化学は,その優れた分離性能の鍵です.
- このHOF吸着剤は,ポリマーグレードのエチレンの工業生産に有効な経路を提供します.
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