甲基,乙基,基和丁基乳酸盐在高压CO2中溶液热力学
Uma Sankar Behera1, Jiyun Shim1, Hyun Seong Lee1
1Department of Chemical and Biomolecular Engineering, Chonnam National University, Yeosu, Jeonnam 59626, South Korea.
ACS omega
|August 18, 2025
概括
这项研究研究了酸乳酸盐与超临界二氧化碳 (SC-CO2) 的相位行为. 观察到增强的混合性,这对于优化SC-CO2分离过程至关重要.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 热力学是一种热力学.
- 分离过程 分离过程.
背景情况:
- 酸乳酸盐 (甲基,乙基,基,丁基) 越来越多地被要求用于工业应用.
- 准确的蒸汽-液体平衡 (VLE) 数据对于设计分离过程至关重要,特别是使用超临界二氧化碳 (SC-CO2) 的分离过程.
- 在高压条件下的SC-CO2和酸乳酸盐二元系统的VLE综合数据有限.
研究的目的:
- 研究由SC-CO2和四种酸乳酸盐 (甲基,乙基,基,丁基) 组成的二元系统的相位过渡和平衡行为.
- 为优化涉及这些化合物的分离过程提供关键的VLE数据.
- 评估 - 罗宾逊状态方程的适用性,以关联实验数据.
主要方法:
- 使用高压相位平衡设备通过合成方法对CO2+酸乳酸盐系统的相位平衡数据的实验性确定.
- 测量是在313.2至393.2K的温度和高达18.48MPa的压力下进行.
- 使用-罗宾逊状态方程 (PR EoS) 的实验泡点数据与范德瓦尔斯单流体混合规则的相关性.
主要成果:
- 发现临界混合物边界连接SC-CO2和相应的酸乳酸盐的临界点.
- 在所有四个系统中都观察到增强的混合性,因为在同热条件下乳酸盐分子分数增加,压力下降相应.
- 根据Van Konynenburg和Scott的说法,相位过渡行为被归类为I型.
- 为每个二进制系统确定了优化的二进制相互作用参数 (k_ij 和 η_ij).
- PR EoS 模型与实验数据有很好的一致性,所有系统的根平均平方偏差 (RMSD) 值都低于 7%.
结论:
- 这项研究成功地为SC-CO2 + 酸乳酸盐系统提供了新的相位平衡数据.
- -罗宾逊状态方程,与优化的二进制相互作用参数,准确地模拟这些系统的相位行为.
- 这些发现对于设计和优化利用SC-CO2和酸乳酸盐的工业分离过程具有价值.
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