Multiple steady states in reactive distillation: kinetic effects
Multiple steady states in reactive distillation: kinetic effects
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DOI：
10.1016/s0098-1354(01)00750-5
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发表时间：
2002-01
影响因子：
4.3
通讯作者：
Fengrong Chen;Robert S. Huss;M. Doherty;M. F. Malone
中科院分区：
文献类型：
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作者：
Fengrong Chen;Robert S. Huss;M. Doherty;M. F. Malone
建立了反应精馏过程动力学模型。Damköhler数（Da），特征停留时间与特征反应时间的比值，是关键参数。一个全面的解决方案的图片被发现与弧长连续的方法，跟踪解决方案分支作为Da，重沸比，或回流比的函数。对于甲基叔丁基醚（MTBE）合成的Jacobs-Krishna柱配置，该模型再现已知的溶液的多重性在反应平衡的极限。除了这些以前已知的平衡解决方案，我们报告的动力学对解决方案的多重性的影响的新结果。特别地，在Da的几个值处发现分离的溶液分支;隔离带收缩并且在Da的临界值以下消失。54（1999）1029]形成鲜明对比;对于所有回流比值，动力学状态中存在的多重性在Da的临界值以上消失。
A model is developed to describe kinetic effects in reactive distillation. A Damköhler number (Da), the ratio of a characteristic residence time to a characteristic reaction time, is the key parameter. A comprehensive picture of solutions is found with arc length continuation methods that trace solution branches as functions of Da, reboil ratio, or reflux ratio. For methyl tert-butyl ether (MTBE) synthesis in the Jacobs–Krishna column configuration, the model reproduces known solution multiplicities in the limit of reaction equilibrium. In addition to these previously known equilibrium solutions, we report new results concerning the effect of kinetics on solution multiplicity. In particular, isolated solutions branches are found at several values of Da; the isola shrinks and disappears below a critical value of Da. Results for tert-amyl methyl ether (TAME) synthesis in a model for the test column of Mohl et al. [Chem. Eng. Sci. 54 (1999) 1029] are in sharp contrast; multiplicities present in the kinetic regime disappear above a critical value of Da for all values of reflux ratio.