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Processes 2013, 1(3), 330-348; doi:10.3390/pr1030330
Article

Averaging Level Control to Reduce Off-Spec Material in a Continuous Pharmaceutical Pilot Plant

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Received: 13 September 2013; in revised form: 26 October 2013 / Accepted: 25 November 2013 / Published: 29 November 2013
(This article belongs to the Special Issue Feature Papers)
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Abstract: The judicious use of buffering capacity is important in the development of future continuous pharmaceutical manufacturing processes. The potential benefits are investigated of using optimal-averaging level control for tanks that have buffering capacity for a section of a continuous pharmaceutical pilot plant involving two crystallizers, a combined filtration and washing stage and a buffer tank. A closed-loop dynamic model is utilized to represent the experimental operation, with the relevant model parameters and initial conditions estimated from experimental data that contained a significant disturbance and a change in setpoint of a concentration control loop. The performance of conventional proportional-integral (PI) level controllers is compared with optimal-averaging level controllers. The aim is to reduce the production of off-spec material in a tubular reactor by minimizing the variations in the outlet flow rate of its upstream buffer tank. The results show a distinct difference in behavior, with the optimal-averaging level controllers strongly outperforming the PI controllers. In general, the results stress the importance of dynamic process modeling for the design of future continuous pharmaceutical processes.
Keywords: control; process modeling; process simulation; parameter estimation; dynamic modeling; optimization; crystallization; continuous pharmaceutical manufacturing control; process modeling; process simulation; parameter estimation; dynamic modeling; optimization; crystallization; continuous pharmaceutical manufacturing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Lakerveld, R.; Benyahia, B.; Heider, P.L.; Zhang, H.; Braatz, R.D.; Barton, P.I. Averaging Level Control to Reduce Off-Spec Material in a Continuous Pharmaceutical Pilot Plant. Processes 2013, 1, 330-348.

AMA Style

Lakerveld R, Benyahia B, Heider PL, Zhang H, Braatz RD, Barton PI. Averaging Level Control to Reduce Off-Spec Material in a Continuous Pharmaceutical Pilot Plant. Processes. 2013; 1(3):330-348.

Chicago/Turabian Style

Lakerveld, Richard; Benyahia, Brahim; Heider, Patrick L.; Zhang, Haitao; Braatz, Richard D.; Barton, Paul I. 2013. "Averaging Level Control to Reduce Off-Spec Material in a Continuous Pharmaceutical Pilot Plant." Processes 1, no. 3: 330-348.

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