Recursive data-based prediction and control of product quality for a PMMA batch process |
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Authors: | Yangdong Pan |
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Affiliation: | a School of Chemical Engineering, Purdue University, West Lafayette, IN 47907-1283, USA b School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100, USA |
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Abstract: | In many batch processes, frequent process/feedstock disturbances and unavailability of direct on-line quality measurements make it very difficult to achieve tight control of product quality. Motivated by this, we present a simple data-based method in which measurements of other process variables are related to end product quality using a historical data base. The developed correlation model is used to make on-line predictions of end quality, which can serve as a basis for adjusting the batch condition/time so that desired product quality may be achieved. This strategy is applied to a methyl methacrylate (MMA) polymerization process. Important end quality variables, the weight average molecular weight and the polydispersity, are predicted recursively based on the measurements of reactor cooling rate. Subsequently, a shrinking-horizon model predictive control approach is used to manipulate the reaction temperature. The results in this study show promise for the proposed inferential control method. |
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Keywords: | Data-based control Quality control Recursive prediction Batch reactor control MMA polymerization |
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