Air-dictated bottom spray process: impact of fluid dynamics on granule growth and morphology

Liew, Celine Valeria; Er, Dawn Z.L.; Heng, Paul Wan Sia

doi:10.1080/03639040802680255

Cited by 5 publications

(1 citation statement)

References 33 publications

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“…Chlorpheniramine maleate (BP grade, China) was used as a model drug. (18) Granules are irregular in shape (18) "One-pot" system for contained production (19) More spray drying of binder solution Bottom spray Smaller granules (20) Denser granules (20,21) Spherical granules with better flow (21) Slower granule growth (20) Smoother surface granules (22) Higher risk of overwetting Less spray drying of binder solution (23) Need reasonably well flowing feed powders Robust process at low spray rate (21). Tangential spray Supports higher spray rate (24,25) Denser granules (25,26) Less dependent on flow properties of powder feed (26) Material loss due to adhesion to friction plate (26) Powder elutriation only at higher airflow (24) Scale-up designs are expensive and impractical Granule growth is relatively uniform (25) Risk of bed overwetting is high Granules have good flow properties (25,26) Granules have low friability (25) Homogeneous drug distribution (26) …”

Section: Methodsmentioning

confidence: 99%

Investigation on Side-Spray Fluidized Bed Granulation with Swirling Airflow

2012

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Abstract. Top-spray fluidized bed granulation with axial fluidization airflow from the bottom of the granulator is well-established in the pharmaceutical industry. The application of swirling airflow for fluidized bed granulation was more recently introduced. This study examined the effects of various process parameters on the granules produced by side-spray fluidized bed with swirling airflow using the central composite and Box-Behnken design of experiment. Influence of the amount of binder solution, spray rate, and distance between spray nozzle and powder bed were initially studied to establish operationally viable values for these parameters. This was followed by an in-depth investigation on the effects of inlet airflow rate, atomizing air pressure and distance between spray nozzle and powder bed on granule properties. It was found that the amount of binder solution had a positive correlation with granule size and percentage of lumps but a negative correlation with size distribution and Hausner ratio of the granules. Binder solution spray rate was also found to affect the granules size. High drug content uniformity was observed in all the batches of granules produced. Both inlet airflow rate and atomizing air pressure were found to correlate negatively with granule size and percentage of lumps but correlate positively with the size distribution of the granule produced. Percentage of fines was found to be significantly affected by inlet airflow rate. Distance between spray nozzle and powder bed generally affected the percentage of lumps.

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