Extension of the Mass Transfer Calculation for Three-Phase Distillation in a Packed Column: Nonequilibrium Model Based Parameter Estimation
Extension of the Mass Transfer Calculation for Three-Phase Distillation in a Packed Column: Nonequilibrium Model Based Parameter Estimation
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DOI：
10.1021/ie900404p
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发表时间：
2009-06
影响因子：
4.2
通讯作者：
Liang Chen;J. Repke;G. Wozny;Shuqing Wang
中科院分区：
文献类型：
--
作者：
Liang Chen;J. Repke;G. Wozny;Shuqing Wang
填料塔内三相（汽液液）精馏的非平衡（NEQ）模型仍缺乏可靠的关联式来计算基于速率的相间传质。在本文中，扩展了两个最常用的相关性[即，罗查相关性（罗查，J.A.;布拉沃，J. L.;很好，J. R。含有规整填料的精馏塔：其性能的综合模型。2.传质模型Ind.Eng.Chem.Res.1996，35，1660）和Billet和Schultes相关性（Billet，R.; Schultes，M.具有倾倒和排列填料的传质塔的预测：Billet & Schultes计算方法的更新摘要。化学工程研究设计部1999，77，498）]提出了用于填料塔中三相精馏的传质计算。在两相（汽液）和三相精馏的综合实验研究的基础上估计的关联式中使用的参数。实验数据库包含不同填料（Montz-Pak B1-350、Raschig Super-Ring 0.3、Rombopak 9 M）的1-丁醇/水/ 1-丙醇体系的150个不同实验。多数据集多重包装参数估计是一个包含大量非线性模型方程的大规模优化问题。为了降低问题维数，消除参数间的耦合，提出了一种分层估计策略。这些参数分为与填料相关的参数和与流动相关的参数，分别利用两相和三相精馏实验数据进行估算。由此导出了三相精馏传质计算的推广。在NEQ模型预测方面取得了实质性的改进。与两相精馏相比，所研究的三相体系的总传质能力有所提高。传质计算的扩展可以对这一现象给出合理的解释，从而更好地理解三相填料塔内的本征传质现象。
Nonequilibrium (NEQ) modeling of three-phase (vapor-liquid-liquid) distillation in a packed column is still lacking of reliable correlations to calculate the interphase rate-based mass transfer. In this paper, extensions of the two most-used correlations [i.e., the Rocha correlation (Rocha, J. A.; Bravo, J. L.; Fair, J. R. Distillation Columns Containing Structured Packings: A Comprehensive Model for Their Performance. 2. Mass-Transfer Model. Ind. Eng. Chem. Res. 1996, 35, 1660) and the Billet and Schultes correlation (Billet, R.; Schultes, M. Prediction of Mass Transfer Columns with Dumped and Arranged Packings: Updated Summary of the Calculation Method of Billet & Schultes. Chem. Eng. Res. Des. 1999, 77, 498)] are proposed for mass transfer calculation of three-phase distillation in a packed column. Parameters used in the correlations are estimated on the basis of comprehensive experimental investigations on both two-phase (vapor-liquid) and threephase distillation. The experimental database contains 150 different experiments of the 1-butanol/water/ 1-propanol system for different packings (Montz-Pak B1-350, Raschig Super-Ring 0.3, Rombopak 9M). The parameter estimation with multiple data sets and multipacking turns out to be a large-scale optimization problem subjected to a large number of nonlinear model equations. To reduce the problem dimension and remove coupling among the parameters, a hierarchical estimation strategy is proposed. The parameters are classified into packing-related and flow-related parameters, which are estimated using two-phase and threephase distillation experimental data, respectively. In this way, the extension of mass transfer calculation for three-phase distillation is derived. Substantial improvements in the NEQ model prediction have been achieved. Compared with two-phase distillation, an increase of overall mass transfer ability is observed for the studied three-phase system. The extension of the mass transfer calculation can give a reasonable explanation for this observation, providing a better understanding of the intrinsic transfer phenomena inside three-phase packed columns.