Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 210, Issue -, Pages 195-208Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.08.004
Keywords
Side-stream extractive distillation; Control structure; Dynamic controllabilities; Separation
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Funding
- National Natural Science Foundation of China [21776145]
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It is important to study the dynamic controllability for the side-stream extractive distillation due to its superiority of energy saving. Control structures of the side-stream extractive distillation process are special and complex due to the instability of side-stream flow rate. In this work, the dynamic control of the side-stream extractive distillation was explored for separating azeotropic mixture of acetone and methanol. The detailed control structures were used to investigate the control strategies of side-stream extractive distillation. During the whole design process, the control of flow rate on side stream is a key factor for achieving this process efficient control. A new control structure combining a component controller and a side-stream throughput valve was proposed to achieve good dynamic performance for the side-stream extractive distillation process when +/- 10% disturbances were introduced, but it is difficult to control the +/- 20% feed disturbances. In addition, the side stream extractive distillation takes about a longer time to reach a steady state while maintaining the purity of products, compared with conventional process. Research on control performance is of great significance to the development of energy saving technology for side-stream extractive distillation.
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