使用真实吸附溶液理论,模拟全氧化中乙醇/水吸附的模型
Anne V Le1, Michael Tsapatsis2, J Ilja Siepmann3
1Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003-9303, USA.
The Journal of chemical physics
|January 9, 2025
概括
大规律的蒙特卡洛模拟显示,化石中乙醇/水吸附度不理想. 水活动系数高于乙醇,表明不太有利的相互作用,影响分离预测.
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.
- 计算化学计算化学
背景情况:
- 热质石是气体和液体分离的关键多孔材料.
- 了解乙醇/水吸附对于脱水等工业过程至关重要.
- 需要对吸附行为进行预测模型,以优化热带石的性能.
研究的目的:
- 通过模拟,系统地分析不同类石中乙醇/水吸附的情况.
- 评估理想吸附溶液理论 (IAST) 和真实吸附溶液理论 (RAST) 的准确性.
- 导出和解释以乙醇/水混合物中吸附的热的活性系数.
主要方法:
- 大法典蒙特卡罗 (GCMC) 模拟用于吸附等热体.
- 收集了185种热的单元和二元吸附数据.
- IAST和RAST框架的应用和分析.
- 使用 RAST 来推导活动系数.
主要成果:
- 水的活性系数通常高于单位,表明非理想的行为.
- 水与乙醇的相互作用不如热石中的水与水的相互作用那么有利.
- 偏离理想行为是结构依赖的,但与毛孔大小没有明确的相关性.
- 准确的低负荷单极同热体对于可靠的活动系数预测至关重要.
- 活动模型参数的全球回归优于本地拟合.
- 马格尔的模型在所有条件下都很难捕捉非理想的吸附.
结论:
- 与IAST相比,RAST提供了更好的预测,用于乙醇/水吸附在热石中,特别是在典型的溶液阶段条件下.
- 石特定的参数可以提高RAST的准确性.
- 该研究强调了准确的模拟数据和适当的热力学模型对于预测混合物吸附的重要性.
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