Heat transfer effect in scaling-up a fluidized bed reactor for propylene polymerization

Area of Science:

• Chemical Engineering
• Polymer Science

Background:

• Fluidized bed reactors are crucial for propylene polymerization.
• Effective temperature control and performance are key challenges in these reactors.

Purpose of the Study:

• To investigate the impact of operating conditions and scaling-up on reactor temperature control and performance.
• To identify an optimal operating window for enhanced productivity and temperature stability.

Main Methods:

• Utilized phenomenological and computational fluid dynamics (CFD) models.
• CFD models provided local details, while phenomenological models offered average information.

Main Results:

• Increased catalyst feed rate, temperature, reactor size, and superficial velocity can improve productivity and temperature control.
• High catalyst loading boosts productivity but risks temperature oscillations and hot spots.
• Scaling up requires adjustments in heat transfer area or wall temperature to maintain consistent temperature.

Conclusions:

• An operating window exists to balance productivity and temperature control.
• Mixing significantly impacts heat transfer but not propylene conversion.
• Scale-up necessitates specific strategies for heat transfer management to avoid hot spots.