Integrating knowledge-guided symbolic regression and model-based design of experiments to automate process flow diagram development

New products must be formulated rapidly to succeed in the global formulated product market; however, key product indicators (KPIs) can be complex, poorly understood functions of the chemical composition and processing history. Consequently, scale-up must currently undergo expensive trial-and-error campaigns. To accelerate process flow diagram (PFD) optimisation and knowledge discovery, this work proposed a novel digital framework to automatically quantify process mechanisms by integrating symbolic regression (SR) within modelbased design of experiments (MbDoE). Each iteration, SR proposed a Pareto front of interpretable mechanistic expressions, and then MbDoE designed a new experiment to discriminate them while balancing PFD optimisation. To investigate the framework's performance, a new process model capable of simulating general formulated product synthesis was constructed to generate in-silico data for different case studies. The framework effectively discoverd ground-truth process mechanisms within a few iterations, indicating its great potential for the general chemical industry for digital manufacturing and product innovation.