二氧化碳选择性超过乙在有前途的双三 (甲) 胺基离子液体中
Eric Quaye1, Amr Henni1, Ezeddin Shirif2
1Industrial Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada.
Molecules (Basel, Switzerland)
|March 13, 2025
概括
这项研究测量了三种离子液体 (IL) 中的乙溶解度,用于天然气甜味. 虽然IL-2显示出高乙吸收,但所有IL的表现都比Selexol差,这表明它们在没有乙的情况下用于CO2捕获.
科学领域:
- 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
- 分离科学 分离科学
背景情况:
- 天然气甜味需要有效的二氧化碳 (CO2) 捕获.
- 在离子液体 (ILs) 中的乙 (C2H6) 共同吸收对选择性去除二氧化碳提出了挑战.
- 了解IL与不同气体的相互作用对于过程优化至关重要.
研究的目的:
- 为了研究乙 (C2H6) 在三个特定的离子液体 (ILs) 中的溶解性.
- 评估这些ILs对二氧化碳捕获的性能,特别是关于乙共吸收的性能.
- 使用-罗宾逊状态方程 (PR-EoS) 对乙溶解度数据进行相关联.
主要方法:
- 在[IL-1],[IL-2]和[IL-3]中测量乙 (C2H6) 溶解度在303.15 K和343.15 K至1.2 MPa时.
- 使用 - 罗宾逊状态方程 (PR-EoS) 与三个混合规则相关的可溶性数据.
- 确定乙 (C2H6) 到二氧化碳的选择性,并计算吸收的和.
主要成果:
- 乙 (C2H6) 溶解度在ILs之间有所不同,其中[IL-2]由于其较长的基链,显示出最高的容量.
- 与商业溶剂Selexol/Genosorb 1753相比,所有测试的IL显示性能较低.
- 乙 (C2H6) 与二氧化碳的选择性按照[IL-1]>[IL-3]>[IL-2]的顺序进行.
结论:
- 测试的IL更适合用于缺乏乙的二氧化碳捕获应用,例如烟气处理,可能在氨基混合物中.
- IL结构显著影响乙溶解度,表明设计针对特定气体分离的定制IL的潜力.
- 乙在这些IL中表现出比CO2更弱的相互作用和更低的溶解度,由热力学数据证实.
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