Chromogenic Absorbent Particles With Low-Shear Polysaccharide Granulation

The patent extracts the essential function of wet granulation (forming granules with improved hydrophilicity) while removing the costly and energy-intensive equipment requirements. This is achieved by using a fluid bed granulator that operates with minimal mechanical intervention, allowing granules to form naturally through fluidization and controlled liquid addition rather than requiring complex high-shear mixers or extrusion equipment.

The patent replaces mechanical granulation systems (high-shear mixers, extruders) with a fluid-based system. The fluid bed granulator uses upward flowing gas to suspend and fluidize the powder bed, replacing mechanical mixing and granulation forces with fluid dynamic forces, thereby reducing equipment complexity and manufacturing cost while maintaining granule formation and hydrophilicity improvement.

The patent employs mechanical vibration of the powder bed during the granulation process to enhance compound distribution. The vibration prevents powder compaction, promotes uniform liquid distribution throughout the bed, and facilitates granule growth through controlled collisions, achieving better compound distribution without the excessive mechanical shear forces that cause material degradation.

The patent uses pneumatic fluidization to distribute the liquid binder uniformly throughout the powder bed. The upward gas flow suspends particles and creates a homogeneous mixture environment, allowing the liquid compound to distribute evenly throughout the granules without requiring high-shear mechanical mixing that would degrade sensitive materials.

The patent implements continuous fluid bed granulation where powder is continuously fed into the fluidized bed, liquid binder is continuously added, and granules are continuously formed and discharged. This continuous operation eliminates batch processing interruptions, reduces labor intervention, and maintains constant granulation activity, thereby reducing processing time despite the automated nature of the system.

The patent employs periodic pulsing of the liquid binder addition during granulation to optimize granule growth rates. The periodic liquid addition creates controlled wetting cycles that promote uniform granule formation while preventing over-wetting and agglomeration, thereby accelerating the granulation process and reducing overall processing time.