Experimental investigation of conventional control strategies for a heterogeneous azeotropic distillation column

Experimental Validation of Model-Based Control Strategies for Multicomponent Azeotropic Distillation

“…The analysis indicated that two configurations were viable (see Table 3). The results from the RGA analysis were consistent with the traditional control configuration used in ordinary distillation (pairing 1) and the results from studies in azeotropic distillation where the opposite pairing (pairing 2) gave less loop interaction than the traditional variable pairing used in distillation (Chien, et al, 2000;Tonelli, et al, 1997).…”

“…For these reason, in order to isolate two pure components which lie in two different distillation regions, it is necessary to have two different feed compositions (one from each of the two regions) and two distillation columns (Doherty and Caldarola 1985). Published experimental work on azeotropic distillation has often analyzed the behavior of the azeotropic distillation systems in laboratory scale sieve columns (Baur, et al, 1999;Müller and Marquardt, 1997;Springer and Krishna, 2001;Wang, et al, 1998); in addition, some experimental studies (Chien, et al, 2000) have also implemented different control strategies using temperature as the controlled variable. This work presents the results from experimental validation of dynamic models of an azeotropic distillation system of methanol, normal pentane and cyclohexane.…”

Design and control of acetic acid dehydration system via heterogeneous azeotropic distillation

“…The first inventory control strategy (Inventory Strategy #1) uses entrainer makeup flow to control the organic phase level in the decanter. This inventory control strategy was successfully used in Chien et al (1999bChien et al ( , 2000a when controlling an isopropyl alcohol dehydration column. The second inventory control strategy (Inventory Strategy #2) uses organic reflux flow to control the organic phase level in the decanter.…”

“…Chien et al (1999b) proposed an inverse double temperature loop control strategy for the isopropyl alcohol + cyclohexane + water system. Experimental verification of the above control strategy can be seen in Chien et al (2000a). Chien et al (2000b) proposed a simple operating procedure under inverse double loop control strategy to automatically adjust the column heat duty and organic reflux to be at optimum operating point and also proposed an improved decoupling control strategy for the double loops.…”

Control of a multiunit heterogeneous azeotropic distillation process

“…A similar system has been studied by Chien and coworkers. [5][6][7][8] They studied the heterogeneous azeotropic system of isopropyl alcohol, cyclohexane, and water. Both design and control issues were presented, as well as experimental results.…”