Global analysis of combined reaction distillation processes

Global analysis of combined reaction distillation processes
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组合反应精馏过程的全局分析

DOI:
10.1016/j.compchemeng.2007.04.015
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发表时间:
2008
期刊:
Comput. Chem. Eng.
影响因子:
--
通讯作者:
Robert Weismantel
Robert Weismantel
中科院分区:
--
文献类型:
--
作者:
Jignesh Gangadwala;Utz–Uwe Haus;Matthias Jach;Achim Kienle;Dennis Michaels;Robert Weismantel

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多面体松弛是确定化工过程综合最优解全局边界的有力工具。组合反应精馏过程被认为是一个具有挑战性的应用实例。为了降低所得到的混合整数线性优化问题的复杂性,提出了通过波函数的模型降阶,并推导了两个变量的S形波函数的多面体松弛。结果表明,这些松弛提供了更好的近似质量比单独近似的组成函数。此外,凹包络的功能和(非线性)凸低估。将近似结果应用于复分解反应2B → A+C的组合反应精馏过程的汽流下界计算。我们将计算限制在已知局部最优值周围的域,用计算时间换取一些全局性。这仍然证明了对蒸气流的限制,但对于受限的塔操作条件。
Polyhedral relaxation is a powerful tool for determining global bounds on optimal solutions in chemical process synthesis. Combined reaction distillation processes are considered as a challenging application example. To reduce complexity of the resulting mixed integer linear optimization problems, model reduction by means of wave functions is proposed, and polyhedral relaxations of sigmoidal wave functions in two variables are derived. It is shown that these relaxations provide better approximation quality than approximating the composed functions individually. Further, the concave envelope of such functions is characterized and (nonlinear) convex underestimators are derived. The approximation results are employed in the computation of lower bounds on the vapor flow of a combined reaction distillation process with a metathesis reaction 2B⇋A+C. We restrict computations to a domain around a known local optimum, trading computation time for some of the globality. This still proves a bound on the vapor flow, but for restricted operating conditions of the column.
2,3 二甲基丁烯-1 生产最佳解决方案的全球范围
DOI: 10.1021/ie050584j
发表时间: 2006
影响因子: 4.2
作者:
Jignesh Gangadwala;Achim Kienle;Utz–Uwe Haus;Dennis Michaels;Robert Weismantel
通讯作者: Robert Weismantel
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发表时间: 2007
期刊: Comput. Chem. Eng.
影响因子: --
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DOI: --
发表时间: 1986
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