Startup Operation of a Cyclic Middle Vessel Batch Distillation
نویسندگان
چکیده
Batch distillation is one of the most important unit operations for the small-scale production of specialty and fine chemicals. The so called Middle Vessel Batch Distillation (MVBD) with total reflux offers many advantages compared to conventional batch distillation. It is favourable due to the simultaneous production of three products of high purity. In this work, we present a thorough analysis of the startup of a MVBD column for the first time. The column is initially at ambient conditions. Therefore, we present an accurate dynamic model that includes the heating of the distillation column and peripheral equipment as well as the formation and propagation of the hydraulic and thermodynamic profiles. Finally, we compare two startup procedures on the basis of simulation studies. The results impressively point out that switching of important manipulated variables during startup can increase the process performance.
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