Abstract
Abstract Conventional batch distillation and middle-vessel batch distillation were studied for the separation of the ternary system of cyclohexane/n-heptane/toluene, which has low relative volatilities. The modified variable and constant reflux operations were applied in the conventional batch distillation. Two control structures were used: one of which was referred to as the composition control structure with a modified level-set point, and the other was referred to as the flowrate-limiting control structure. Thus, the middle-vessel batch distillation was able to simultaneously separate the components of the ternary mixture. Comparing the two control structures showed that the flowrate-limiting control structure was better than the composition control structure with a modified level-set point in terms of their applicability. Disturbances were introduced to assess the controllability of the flowrate-limiting control structure. The dynamic responses demonstrated that the control structure performed well. The results showed that the modified conventional batch distillation and middle-vessel batch distillation increased the purity of the separated components compared to previous studies.
Highlights
Batch distillation is widely used in the pharmaceutical industry to purify and recover highvalue liquid components
Over many years of improvement, batch distillation processes have been developed that can be used in special distillation processes, such as pressure-swing distillation (Modla, 2011; Repke et al, 2007), extractive distillation (Fang et al, 2010; Navarrete-Contreras et al, 2014; Pacheco-Basulto et al, 2012), and reactive distillation (Khazraee and Jahanmiri, 2010; Modla, 2011), which are based on different column configurations, including conventional and unconventional column configurations
Conventional batch distillation and middle-vessel batch distillation (MVBD) were studied to separate a mixture of cyclohexane/nheptane/toluene
Summary
(Submitted: September 2, 2016; Revised: March 11, 2017; Accepted: April 10, 2017). Abstract - Conventional batch distillation and middle-vessel batch distillation were studied for the separation of the ternary system of cyclohexane/n-heptane/toluene, which has low relative volatilities. Two control structures were used: one of which was referred to as the composition control structure with a modified level-set point, and the other was referred to as the flowrate-limiting control structure. The middle-vessel batch distillation was able to simultaneously separate the components of the ternary mixture. Comparing the two control structures showed that the flowrate-limiting control structure was better than the composition control structure with a modified level-set point in terms of their applicability. The results showed that the modified conventional batch distillation and middle-vessel batch distillation increased the purity of the separated components compared to previous studies
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