Comparison between a Homo- and a Heterosegmented Group Contribution Approach Based on the Perturbed-Chain Polar Statistical Associating Fluid Theory Equation of State

Comparison between a Homo- and a Heterosegmented Group Contribution Approach Based on the Perturbed-Chain Polar Statistical Associating Fluid Theory Equation of State
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基于扰动链极统计关联流体理论状态方程的同分段群贡献法与异分段群贡献法的比较

DOI:
10.1021/ie502203w
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发表时间:
2014
影响因子:
4.2
通讯作者:
Stavrou
Stavrou
中科院分区:
工程技术3区
文献类型:
--
作者:
Stavrou

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根据分子模型,基于统计缔合流体理论(SAFT)的基团贡献(GC)方法可以分为同源GC方法和异源GC方法。在同源GC方法中,分子被建模为由相同片段组成的链。另一方面,异片段GC方法考虑由不同片段类型组成的分子链,从而保持真实分子的更详细的图像。因此,异段气相色谱方法可以说更符合物理现实,并且应该能够更准确地描述热力学性质。在这项工作中,我们基于扰动链极性 SAFT (PCP-SAFT) 状态方程 (EoS) 评估同分段和异分段 GC 方法的性能。为了确保两种 GC 方法之间进行有意义的比较,制定了异段 GC 方法的偶极子术语。 22个官能团的组参数被调整为纯组分性质数据。两种 GC 方法之间的比较表明,异段 GC 方法与各种化学家族的实验数据显着更好地一致。
Depending on the molecular model, group contribution (GC) approaches based on the statistical associating fluid theory (SAFT) can be classified in homosegmented and heterosegmented GC approaches. In homosegmented GC approaches, molecules are modeled as chains composed of identical segments. Heterosegmented GC approaches, on the other hand, consider molecular chains composed of different segment types and thus maintain a more detailed picture of real molecules. Therefore, heterosegmented GC approaches are arguably more physically realistic and ought to give more accurate descriptions of thermodynamic properties. In this work, we evaluate the performance of a homosegmented and a heterosegmented GC approach based on the perturbed-chain polar SAFT (PCP-SAFT) equation of state (EoS). To ensure a meaningful comparison between both GC approaches, a dipole term for the heterosegmented GC approach is formulated. Group parameters of 22 functional groups were adjusted to pure component property data. The comparison between both GC approaches shows that the heterosegmented GC approach leads to significantly better agreement with experimental data for various chemical families.
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