(90h) Challenges in the Particle Characterization and Fluidization of Group C Solids

Characterized by their fine size (< 30 µm) and cohesive nature, Geldart Group C solids pose considerable and interconnected challenges in both achieving accurate particle characterization and effective fluidization. While their large specific surface area enhances their utility in processes like catalyst synthesis and surface modification, strong interparticle forces lead to agglomeration, complicating analysis and necessitating careful handling and the employment of multiple characterization techniques to obtain reliable data crucial for predicting their fluidization behavior.

However, they are also particularly difficult to characterize due to their strong interparticle forces resulting in significant agglomeration as well as inaccuracies in characterization. This clumping behavior can complicate accurate analysis in particle characterization, requiring meticulous handling of the materials. Furthermore, in conducting analysis, the employment of multiple characterization techniques becomes essential to developing a more comprehensive understanding of the characterization of that specific material.

Obtaining accurate and representative results during particle characterization measurements is crucial to understanding the fluidization characteristics and behavior of a certain material. However, the inherent cohesiveness and tendency to agglomerate, even when employing multiple methods of characterization. Consequently, in fluidized beds, these properties often manifest as severe channeling and may remain in a mostly de-fluidized state, leading to the widespread perception that achieving quality fluidization of Group C particles is exceedingly difficult, if not near impossible. Nevertheless, recent findings suggest that new techniques may mitigate these negative behaviors seen with Group C powders and can be fluidized.

This presentation will review particle characterization methodologies and handling protocols for minimizing measurement errors, while also highlighting recent developments suggesting that new techniques can offer a promising approach to overcome the inherent fluidization limitations of Group C powders.