(357c) Dynamic Intensification of Ternary Distillation Columns
In this paper, we will rely on a strategy for process intensification in the temporal domain, which we refer to as âdynamic process intensification (DPI).â DPI seeks to achieve improvements in process efficiency and economics by exploiting and favorably manipulating the interplay of multiple coupled phenomena occurring in a conventional or intensified process . In particular, DPI relies on periodic forcing on the available manipulated variables of a column, imposing a cyclic operating regime that generates the desired product as a mixture of two or more auxiliary products, each having lower energy consumption than the desired product [4,5].
Our research is motivated by the large energy consumption of multi-component (in particular, ternary) distillation columns across the chemical and petrochemical industries. We present a conceptual framework for dynamic intensification. Then, the canonical model of a ternary distillation column separating a mixture of cyclohexane, toluene and m-xylene is used to illustrate the theoretical ideas. We demonstrate that, all other factors being equal, dynamic process intensification results in considerable energy savings compared to steady-state operation of the same column, with the added economic benefit that it requires minimal capital expenditure.
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