一种深层阳性溶剂粘度对二氧化碳捕获性能的影响 在一个节能膜接触器基的节能过程中
Zachary Coin1, Shailesh Dangwal1, Mary Hannah Irwin2
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830-8050, United States.
ACS omega
|February 10, 2025
概括
使用绿色溶剂再线的新型空心纤维膜接触器工艺有效地从烟气中捕获二氧化碳. 这种方法提高了二氧化碳分离的纯度和流量,为缓解气候变化提供了一个可扩展的解决方案.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 对温室气体排放的日益关注,需要有效的二氧化碳 (CO2) 分离技术.
- 由于它们的有利性质,深度浸泡溶剂 (DES) 是一类有前途的选择性二氧化碳吸收剂.
- 瑞林是一种由胆化物和尿素组成的DES,具有成本效益,稳定性,无毒性和生物降解性.
研究的目的:
- 为了展示一个可扩展和节能的空心纤维膜接触器 (HFMC) 过程,以捕获二氧化碳,使用绿色溶剂.
- 通过调整溶剂特性来研究物理吸收机制并优化二氧化碳捕获性能.
主要方法:
- 使用一个空心纤维膜接触器 (HFMC) 系统与商业聚合物膜和 reline DES.
- 从混合N2/CO2气体流中评估的CO2分离.
- 研究了水添加对reline粘度和二氧化碳捕获性能的影响.
- 在现场采用富里埃变换红外光谱 (FTIR) 和核磁共振 (NMR) 进行机械研究.
主要成果:
- 使用基于reline的HFMC系统实现了97%mol%的CO2纯度.
- 通过添加水来降低reline粘度,显著增加了CO2透流量约8倍.
- 在最佳条件下 (35 °C,4 bar,60 wt%水) 证明透流量为170 mmol/m2·h.
- 通过物理吸收和压力摆动机制确认了二氧化碳的吸收,没有化学化合物形成.
结论:
- 使用reline的HFMC过程提供了一种高效且可扩展的方法,用于从湿烟气中捕获二氧化碳.
- 添加水有效调整连线粘度,提高二氧化碳捕获性能.
- 这些发现为基于绿色物理溶剂的二氧化碳分离提供了基本的见解,并支持工业部署.
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