酒精调节的相变吸收剂,用于有效的二氧化碳捕获:机制和能源消耗
Chen Wang1, Weixin Kong1, Zhangfeng Dong1
1College of Chemical Engineering, Xiamen Key Laboratory of Terrigenous Environmental Pollution Treatmentand Ecological Remediation, Huaqiao University, Xiamen 361021, China.
Journal of environmental sciences (China)
|September 21, 2024
概括
将乙醇添加到N-aminoethylpiperazine吸收剂中可以显著改善CO2的再生. 这种酒精添加剂通过转化碳酸盐产品来促进二氧化碳的释放,从而减少碳捕获的能源消耗.
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
- 环境科学 环境科学
背景情况:
- 使用氨基化学吸收的相变吸收剂为二氧化碳捕获提供了节能潜力.
- 然而,这些吸收剂在有效的二氧化碳再生方面经常面临挑战.
研究的目的:
- 调查使用酒精作为调节剂,以增强N-氨基乙烯比佩拉 (AEP) /硫/H2O相变吸收剂中的二氧化碳再生.
- 阐明添加酒精提高再生效率的机制.
主要方法:
- 构建离子对模型以模拟二氧化碳产物溶解.
- 吸附试验用于测量再生速率.
- 量子化学计算和13C核磁共振来分析反应路径和激活能量.
主要成果:
- 乙醇 (EtOH) 被确定为最佳调节剂,最大限度地提高了无溶解能量,并实现了0.00763mol/min的再生率.
- 添加EtOH促进了AEP-碳酸盐转化为乙烯碳酸盐,这是一个不太稳定的中间体.
- 乙烯碳酸盐分解的激活能量明显低 (9.465 kJ/mol) 比AEP-碳酸盐 (26.163 kJ/mol) 的激活能量要低得多.
结论:
- 酒精,特别是乙醇,有效地增强了基于AEP的相变吸收剂中的二氧化碳再生.
- 该机制涉及形成更容易分解的中间体,从而改善二氧化碳的释放.
- 这种酒精调节吸收剂具有极好的节能潜力,再生能耗为1.92 GJ/CO2.
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