화학공학소재연구정보센터
Chinese Journal of Chemical Engineering, Vol.27, No.4, 869-876, 2019
A novel kind of multiple steady states characteristics in the dividing wall column
In this article, one kind ofmultiple steady states (MSS) phenomenon was investigated for a dividingwall column (DWC). The four-sectionmodel constructed in Aspen Plus was employed to simulate twoDWC cases: mixture of n-hexane, n-heptane and n-octane; system of methanol, ethanol and n-propanol. It can be seen that there is a range of vapor split ratio in which multiple solutions of reflux ratio exist for fixed DWC configuration with the same feed and product streams. The width and the curve shapes of the MSS region, and the number of solutions change with the liquid split ratio. This MSS phenomenon was further explained using the component recovery around the prefractionator and the component recycling flow inside the DWC. This MSS phenomenon is helpful for DWC design by knowing the probable existence of multiple solutions in advance. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.