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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383


OISIOVICI, R.M.  and  CRUZ, S.L.. Sensor locations and noise reduction in high-purity batch distillation control loops. Braz. J. Chem. Eng. [online]. 2000, vol.17, n.4-7, pp.671-684. ISSN 0104-6632.

The influence of the sensor locations on the composition control of high-purity batch distillation columns has been investigated. Using concepts of the nonlinear control theory, an input-output linearizing controller was implemented to keep the distillate composition constant at a desired value by varying the reflux ratio. An Extended Kalman Filter was developed to estimate the compositions required in the control algorithm using temperature measurements. In the presence of measurement noise, the control performance depended greatly on the sensor locations. Placing the sensors further from the top stages reduced the detrimental effects of noise but increased the inference error. To achieve accurate composition control, both noise reduction and composition estimate accuracy should be considered in the selection of the sensor locations.

Keywords : Batch distillation; Nonlinear control; Kalman filter; Sensor location; High-purity.

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