Risk-Based Spray Drying Scale-Up: From Early Feasibility To Commercial Control Strategy

Spray-dried dispersion development requires more than transferring a recipe from one dryer to another. The poster presents scale-up and technology transfer as a structured, risk-based progression in which formulation knowledge, process understanding, mechanistic modeling, equipment capability, and formal risk assessment converge into a commercial control strategy. Early work uses qualitative CMC risk reviews to identify key concerns across performance, manufacturing, stability, and analytics.

As the program advances, deeper unit-operation reviews establish preliminary material attributes and process parameters, followed by formal Failure Mode Effects Analysis and risk-prioritization calculations in later phases. For spray drying itself, the proposed design space considers spray-solution stability and mixing, atomization, liquid-to-gas scaling, drying temperatures and gas flows, collection efficiency, secondary drying, intermediate hold conditions, and campaign strategy. Semi-theoretical atomization models and spray-solution properties can be used to predict droplet size at larger scale and support particle-size matching across equipment. Thermodynamic spray-dryer modeling, combined with scale-up factors, helps predict droplet drying behavior and preserve target particle morphology. Design of Experiments establishes attribute-parameter relationships and proven acceptable ranges, while demonstration and clinical batches refine normal operating ranges.

The control strategy is then defined within this body of formulation and process knowledge. A white paper can use this framework to explain how scientific scale-up reduces dependence on trial-and-error transfer and creates a traceable path from feasibility through commercial manufacture.