CO2 - 响应性低分子量聚合物具有高透压作为向前透的吸收溶液
Maedeh Ramezani1,2, Sarah N Ellis1, Anna Riabtseva1,2
1Department of Chemistry, Queen's University, Kingston, ON K7L 3N6,Canada.
ACS omega
|January 1, 2024
概括
低分子量聚合物为前进透 (FO) 淡化提供了一个有前途的解决方案,平衡高透压与低粘度,以实现高效的水流和易于回收.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 前进透 (FO) 技术需要有效的吸收溶液,以有效地淡化水.
- 线性聚N,N-二甲基胺 (l-PDMAAm) 显示出作为CO2和热响应吸收剂的潜力.
- 高度的l-PDMAAm导致粘度过高,阻碍了工业应用.
研究的目的:
- 研究分子量和分支对l-PDMAAm溶液的粘度和透压的影响.
- 为了确定最佳的聚合物特性,以提高前向透性能.
- 评估l-PDMAAm作为有效淡化和回收的吸收剂的可行性.
主要方法:
- 合成和表征具有不同分子量的线性和分支l-PDMAAm聚合物.
- 在CO2和空气下测量聚合物溶液的透压.
- 在不同度和聚合物架构下确定溶液粘度.
- 用合成聚合物作为吸附剂评估FO过程中的水流量.
- 通过温度诱导的相分离来评估聚合物回收.
主要成果:
- 与分支聚合物相比,低分子量l-PDMAAm表现出高透压 (在CO2下高达170bar,重量50%) 和低粘度的优越组合.
- 在FO工艺中,与NaCl料溶液相比,实现了高水流量.
- 该聚合物表现出热敏性,在空气下云点在26-33°C之间,促进了CO2驱动的回收.
- 优化的聚合物设计克服了以前吸引剂的粘度限制.
结论:
- 低分子量线性聚 ((N,N-二甲基烯胺) 是一种有效的向前透吸收溶液,提供高透压力和水流量.
- 开发的聚合物通过二氧化碳响应性和热诱导相分离的结合,使得有效的吸取溶液回收.
- 这项研究提出了一个可行的策略,用于推进透技术,用于实际的淡化应用.
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