| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 103 === In this research, we are probe about recovery of succinic acid from fermentation broths with process design and control. Succinic acid is extensively applies in industry and our daily lives, which is one of the most promising commodities in the chemical industry. However, the problem of manufacturing succinic acid does always exist. The recovery of succinic acid process takes up about 50% to 80% of processing cost. Many have attempted to improve and reduce separation steps, but up to now there is not a successful technology scaled up to industrial production. Despite the fact that several separation processes have been proposed to overcome this problem (precipitation, ion exchange resins, membranes, reactive extraction, and liquid-liquid extraction), none addresses the major limit of large energy and material requirements as well as waste generation.
First of all, suitable thermodynamic and kinetic model are chosen to describe this process and perform the steady-state simulation by Aspen Plus. The system in this process is a reversible reaction and seeking out the optimum goal is obtained by minimizing the Total Annual Cost (TAC). After two optimum designs which are about reactive distillation column and separate distillation column are obtained, we connect each unit into a plant-wide process and recycle the un-reacted reactants. Then, we change the feed location to look for the optimum process.
After that, we will discuss the dynamic simulation and control of the plant-wide process by Aspen Dynamic. A simple control strategy including level, temperature, pressure and flow control has been brought forward, and the sensitivity analysis is performed to find the suitable control of each unit. With the interference by adjusting the feed flow rate and feed composition, the proposed control strategy works effectively and holds the purity of the product.
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