Two-Temperature Tracking Control of Batch Binary Batch Distillation Columns

Resumen: In this paper the joint optimal operation and Lyapunov-based tracking control design for binary batch distillation columns with temperature measurements is addressed. The combination of standard batch distillation dynamics concepts with nonlinear constructive control theory allows to design a temperature-measurement driven control policy that enforces the distillate composition to reach its prescribed value in finite time, including two sequential operation mode. First, the system is operated at total reflux (i.e., with no production) for a period of time, to set a proper temperature (i.e., composition) profile in the column. Then, the production period is performed with a suitable temperature-to-temperature Lyapunov tracking controller that enforces the prescribed constant distillate purity policy, without significant overpurification. The methodology includes: (a) guides to select the proper sensor locations, (b) a temperature measurement-driven criteria to set the switching time from total reflux to production period, (c) the on-line generation of temperature policies that ensure constant distillate purity, and (d) a temperature-to-temperature Lyapunov tracking controller that enforces the prescribed constant distillate product purity policy. The methodology is tested with representative binary systems.

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Eduardo Castellanos-Sahagún & Jesús Alvarez. Two-Temperature Tracking Control of Batch Binary Batch Distillation Columns. Memorias del Congreso Nacional de Control Automático, pp. 97-102, 2021.

Palabras clave

Batch distillation, temperature control, Lyapunov function, operation design, tracking control

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