Cooperative CO2 Absorption Isotherms from a Bifunctional Guanidine and Bifunctional Alcohol,ACS Central Science

当前位置： X-MOL 学术 › ACS Cent. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Cooperative CO2 Absorption Isotherms from a Bifunctional Guanidine and Bifunctional Alcohol
ACS Central Science ( IF 12.7 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acscentsci.7b00418
Rachel Steinhardt ₁ , Stanley C. Hiew ₁ , Hemakesh Mohapatra ₁ , Du Nguyen ₂ , Zachary Oh ₂ , Richard Truong ₂ , Aaron Esser-Kahn _{1,

2}

Affiliation

Designing new liquids for CO₂ absorption is a challenge in CO₂ removal. Here, achieving low regeneration energies while keeping high selectivity and large capacity are current challenges. Recent cooperative metal–organic frameworks have shown the potential to address many of these challenges. However, many absorbent systems and designs rely on liquid capture agents. We present herein a liquid absorption system which exhibits cooperative CO₂ absorption isotherms. Upon introduction, CO₂ uptake is initially suppressed, followed by an abrupt increase in absorption. The liquid consists of a bifunctional guanidine and bifunctional alcohol, which, when dissolved in bis(2-methoxyethyl) ether, forms a secondary viscous phase within seconds in response to increases in CO₂. The precipitation of this second viscous phase drives CO₂ absorption from the gas phase. The isotherm of the bifunctional system differs starkly from the analogous monofunctional system, which exhibits limited CO₂ uptake across the same pressure range. In our system, CO₂ absorption is strongly solvent dependent. In DMSO, both systems exhibit hyperbolic isotherms and no precipitation occurs. Subsequent ¹H NMR experiments confirmed the formation of distinct alkylcarbonate species having either one or two molecules of CO₂ bound. The solvent and structure relationships derived from these results can be used to tailor new liquid absorption systems to the conditions of a given CO₂ separation process.

中文翻译：

双功能胍和双功能酒精的合作CO ₂吸收等温线

设计用于吸收CO _2的新液体是去除CO ₂的挑战。这里，在保持高选择性和大容量的同时实现低再生能量是当前的挑战。最近的金属有机合作框架显示了解决许多挑战的潜力。但是，许多吸收剂系统和设计依赖于液体捕获剂。我们在这里提出了一种液体吸收系统，其表现出协同的CO ₂吸收等温线。引入后，CO ₂吸收最初被抑制，然后吸收突然增加。该液体由双官能胍和双官能醇组成，当溶解在双（2-甲氧基乙基）醚中时，响应于CO _2的增加，其在数秒内形成第二粘性相。该第二粘性相的沉淀驱使气相吸收CO ₂。双功能系统的等温线与类似的单功能系统完全不同，后者在相同压力范围内的CO ₂吸收量有限。在我们的系统中，CO ₂吸收强烈依赖于溶剂。在DMSO中，两个系统都显示出双曲线等温线，并且没有沉淀发生。后续¹1 H NMR实验证实形成了结合有一个或两个CO ₂分子的独特的碳酸烷基酯。从这些结果得出的溶剂和结构的关系可用于根据给定的CO ₂分离过程的条件定制新的液体吸收系统。

更新日期：2017-12-06

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11