Add time:08/26/2019         Source:sciencedirect.com

In this work, the extractive distillation process is proposed for the first time to separate the 2-methoxyethanol/toluene mixture. Three configurations, including the conventional extractive distillation (CED), extractive distillation under reduced pressure (EDRP) and extractive dividing-wall column (EDWC) processes are investigated in order to obtain the optimal separation configurations. Their economic feasibilities are estimated by calculating the total annual cost (TAC). The results show that the EDRP process operating at a relatively low pressure is more economic than that operating at the lowest pressure. The TAC of the EDRP and EDWC processes can be saved by 4.88% and 11.04% respectively compared to the CED process, thus the EDWC sequence is superior to the other two processes in economic benefits. Three control strategies are proposed to investigate the controllability of the EDWC process. The results show that the improved dynamic structure can overcome large feed disturbances in flowrate and composition effectively.

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