New Tools for the Computer-Aided Design of Nonideal Distillation Systems

计算机辅助工艺设计领域已经取得了进展 在不久的过去， 在最近的一些 开发是设计复杂工业的新方法 系统. 有一个经济激励发展这样的 工程工具，只要它们简单准确， 能够区分不同的工艺方案， 在项目生命的早期， 不安全，不可控，也不经济。 一个 商业和学术利益的领域，没有 迄今为止成功解决的是非理想的设计， 多组分蒸馏系统 当流程流 形成一个理想的混合体，现有的概念设计方法 提供有效手段， 蒸馏序列，以少数有前途的 替代品. 然后，这些可以在更多的设计和成本 使用基于模拟器的技术。 对于非理想和 共沸混合物，然而，不存在程序或 选择不同非理想蒸馏的工具 序列，而无需执行广泛的全尺寸计算机 辅助模拟和成本计算。 PI计划开发一种新的计算机技术 辅助分析、设计和综合非理想和 共沸蒸馏系统 这些方法利用 非线性离散动力学的几何性质 稳态组成的系统表示法 组合状态空间中的配置文件。 该过程可以 扩展到包括多组分反应蒸馏 列. 该技术还提供了一种程序， 确定最小流量和理论流量 在每个塔段中的级，回流比高于 最小，而不需要冗长的迭代方案，因为 这是目前的做法。 PI计划在商业上考虑 重要的情况，包括非尖锐的分裂，多个饲料 柱和切线收缩。

The area of computer aided process design has advanced substantially in the recent past. Among some of these recent developments are new methods to design complex industrial systems. There is an economic incentive to develop such engineering tools provided they are simple and accurate and are able to discriminate between process alternatives very early in the life of a project in order to eliminate designs that are unsafe, uncontrollable, as well as uneconomic. An area of both commercial and academic interest which has not been successfully addressed to date is the design of nonideal, multicomponent distillation systems. When the process streams form an ideal mixture, existing conceptual design methods provide efficient means for narrowing down the possible distillation sequences to a small number of promising alternatives. These can then be designed and costed in more detail using simulator-based techniques. For nonideal and azeotropic mixtures, however, there exist no procedures or tools for choosing between different nonideal distillation sequences without carrying out extensive full-scale computer aided simulations and costing. The PI plans to develop a new class of techniques for computer aided analysis, design and synthesis of nonideal and azeotropic distillation systems. The methods exploit geometric properties of the nonlinear discrete dynamical system representation of the steady state composition profiles in the composition state space. The procedure can be extended to include multicomponent reactive distillation columns. The technique also provides a procedure for determining the minimum flows and the number of theoretical stages in each column section for reflux ratios above the minimum without the necessity of lengthy iterative schemes, as is the current practice. The PI plans to look at commercially important situations including non-sharp splits, multiple-feed columns, and tangent pinches.