Plantwide control of an isopropyl alcohol dehydration process
Plantwide control of an isopropyl alcohol dehydration process
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DOI：
10.1002/aic.10807
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发表时间：
2006-06-01
期刊：
影响因子：
3.7
通讯作者：
Luyben, WL
中科院分区：
文献类型：
--
作者：
Luyben, WL
溶剂广泛应用于许多行业。回收溶剂的需要要求随后将溶剂从反应过程中产生的组分中分离出来。一个重要的例子是必须与水分离的有机溶剂。由于产生共沸物的复杂汽液平衡，分离常常变得困难。Sommer和Melin1最近研究了几种液体有机溶剂脱水的替代工艺的稳态经济学。他们探索了传统的蒸馏过程和将蒸馏与膜相结合的混合过程。他们的目标是利用膜分离的优点来弥补蒸馏的缺点。他们的文章中没有考虑动力学和控制。目前工业标准的脱水IPA是使用萃取精馏。Sommer和Melin1对这一过程做了相当详细的描述，本文采用他们的设计规范和参数值来设定设备尺寸和运行条件。本文对萃取精馏的控制进行了讨论，推荐了萃取塔和溶剂回收塔的温度控制，以及萃取溶剂的流量与进料流量的比例。本文采用了这种基本结构，但提出了一种更有效的管理溶剂进料比的方法。Anderson等人3讨论了萃取精馏系统的工艺设计和动态可控性之间的相互作用。Zheng等人4探索了一种具有输入多样性的萃取精馏塔。
Solvents are widely used in many industries. The need to recover the solvent requires the subsequent separation of the solvent from components that have been produced during reactions. One important example is an organic solvent that must be separated from water. The separation is frequently made difficult by the occurrence of complex vapor-liquid equilibrium that generates azeotropes.Sommer and Melin1 recently studied the steady-state economics of several alternative processes for the dehydration of liquid organic solvents. They explored both conventional distillation processes and hybrid processes that combine distillation with membranes. Their objective is to use the strengths of membrane separation to complement the weaknesses of distillation. Dynamics and control are not considered in their article. The current industrial standard for the dehydration of IPA is the use of extractive distillation. Sommer and Melin1 provide a fairly detailed description of this process, and their design specifications and parameter values are used in this paper to set equipment sizes and operating conditions. The control of extractive distillation is discussed by Grassi. 2 Temperature control in the extractive column and the solvent recovery column are recommended, as well as ratioing the flow rate of the extractive solvent to the feed flow rate. This basic structure is used in this article, but a more effective way to manage the solvent-to-feed ratio is proposed. Anderson et al. 3 discuss the interaction between process design and dynamic controllability of extractive distillation systems. Zheng et al. 4 explore an extractive distillation column that exhibits input multiplicity.