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マクロパによるBaSO4の急速な溶解,Ba2に対する高い親和性を持つ18個のマクロサイクル
Nikki A Thiele1, Samantha N MacMillan1, Justin J Wilson1
1Department of Chemistry and Chemical Biology, Baker Laboratory , Cornell University , Ithaca , New York 14853 , United States.
Journal of the American Chemical Society
|November 29, 2018
まとめ
新しいリガンドであるマクロパはバリウムイオン (Ba2+) を効果的にケラートし,バリウム硫酸塩 (BaSO4) を溶かす. 石油産業のパイプラインの封鎖に 既存の方法よりも効率的な 解決策を提供しています
科学分野:
- 材料科学
- 化学工学
- 環境科学
背景:
- バリウム硫酸塩 (BaSO4) のスケール形成は,石油産業において重要な運用上の課題とコストをもたらします.
- 既存のケラート剤はBa2+に弱い afinityを示し,BaSO4のスケール溶解に厳しい条件を必要とします.
- BaSO4スケールの効率的な除去には,Ba2+に対する高い結合親和性を有するリガンドが必要です.
研究 の 目的:
- 新しいダイアザ-18-クラウン-6マクロサイクルをBa2+ケレーションのために調査する.
- これらのマクロサイクルの BaSO4 スケールの溶解の有効性を評価する.
- 工業用途の優れたケラート剤を特定する.
主な方法:
- 異なる懸垂アームを持つ3つのダイアザ-18-クラウン-6マクロサイクルの合成と特徴付け.
- 中性pHでのBa2+結合親和性の評価
- 温和な条件下 (室温,pH 8) の BaSO4 溶解効率の評価
- DTPAやDOTAのような最先端のケラート剤との比較
主要な成果:
- ビスピコリネートリガンドであるマクロパは,pH7. 4でBa2+ (log K' = 10. 74) に対して報告された最も高い親和性を示した.
- マクロパは室温とpH8で30分以内にBaSO4の完全な溶解を達成しました.
- マクロパは,同じ条件下でわずか40%の溶解を達成したDTPAとDOTAを大幅に上回った.
- マクロパはまた,天然のバリトのサンプルを溶かすのに優れた性能を示した.
結論:
- マクロパはBa2+の非常に効果的なケラターであり,運動的に安定した複合体を形成する.
- マクロパは,穏やかな条件下でのBaSO4スケールの溶解に著しく効率的な方法を提供します.
- マクロパは,石油生産とスケールリメイクメントにおける工業的な応用に相当する可能性を秘めています.
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