本研究目的是探討碳酸二甲酯製程之設計與控制。首先選擇合適的熱力學與動力學模式來描述程序，並使用Aspen Plus進行穩態模擬。本研究提出系統最適化流程，以最小總年度成本(TAC)為目標，先討論反應蒸餾塔之最適化穩態設計；再接著討論後續的分離，分別以操作在不同壓力下之壓敏蒸餾塔系統及使用萃取劑之萃取蒸餾塔系統找出其穩態最適化設計來進行比較，得知萃取蒸餾塔系統之穩態最適化設計能夠在花費較少TAC下達到我們的分離目的，進而將其整合為整廠穩態最適化設計。接著用Aspen DynamicsTM進行動態模擬。在控制策略上，使用基本的控制環路，並針對每一根塔中溫度最敏感的該板作單板的溫度控制，由產量設定點的改變及進料組成的干擾排除來看，此萃略能夠達到相當好的控制效果。

In this research, design and control of a reactive distillation process to produce dimethyl carbonate (DMC) is studied. Suitable thermodynamic and kinetic model parameters are used to describe this process. There include two part of this process. One is the reactive distillation to make DMC and co-product ethylene glycol, and another is to separate the azotarpe of Methanol/ Dimethy carbonate. A search procedure is proposed to obtain the optimum process design and operating condition of this process. The optimum design flowsheet is obtained by minimizing the Total Annual Cost (TAC) of this process. The optimum design flowsheet about reactive distillation is obtained first, then the optimum design flowsheet about Pressure-Swing azeotropic distillation column system and extractive distillation column system are obtained respectively. Compared of the two alternative separate methods, we derived that the TAC of extractive distillation column system is much less. After that, we use Aspen DynamicTM to do dynamic simulation. A very simple overall control strategy has been proposed which requires only one tray temperature control loop in each column to hold the high-purity specifications of the two products.

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[英文]
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