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Summary
This summary is machine-generated.

Continuous manufacturing (CM) offers pharmaceutical production benefits. Implementing a controlled dryer rotation speed during start-up prevents out-of-specification material, ensuring high yields from the beginning.

Keywords:
continuous manufacturingcost reductionmodel-based controlprocess controlshut-downstart-up

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Area of Science:

  • Pharmaceutical Manufacturing
  • Chemical Engineering

Background:

  • Continuous manufacturing (CM) presents advantages in pharmaceutical production quality, flexibility, safety, and cost.
  • Handling transient conditions, like start-up, is a key challenge in CM, potentially leading to out-of-specification (OOS) material.
  • Pre-heating drying chambers can store thermal energy, causing over-dried granules during initial production phases.

Purpose of the Study:

  • To demonstrate that effective process control strategies during the start-up of continuous granulation and drying can prevent OOS material production.
  • To ensure the benefits of CM are not undermined by reduced production yields due to start-up issues.

Main Methods:

  • Introduction of an automatic ramping procedure for dryer rotation speed into the process control system.
  • Utilizing the dryer's rotation speed to manage drying time and counteract excessive drying capacity during start-up.

Main Results:

  • The implemented control strategy successfully limited or avoided OOS material production during the start-up phase.
  • Granules exiting the dryer met the target loss-on-drying (LOD) specifications from the commencement of production.

Conclusions:

  • Suitable process control strategies are crucial for managing start-up phases in continuous manufacturing.
  • Automatic ramping of dryer rotation speed is an effective method to compensate for initial over-drying and ensure product quality from the start.