An experimental study of fluidized-bed coating: influence of operating conditions on growth rate and mechanism

Expanded bed height determination in a tapered fluidised bed reactor

“…However, the recent advent of continuous fluidised bed coating systems offers considerable advantages and opportunities for an industry which is mostly concerned with bulk volume operations and minimisation of production costs (Teunou & Poncelet, 2002). As a consequence, process losses such as spray drying of the coating solution or defluidisation of the powder bed caused by dry or wet quenching should be avoided as much as possible (Guignon, Duquenoy, & Dumoulin, 2002;Nienow, 1995;Saleh, Cherif, & Hemati, 1999). At the same time, the food technologist has the target of obtaining, batch by batch, a uniform product quality and morphology.…”

Spray drying formulation of hollow spherical aggregates of silica nanoparticles by experimental design

“…Several studies on particle production by spray drying have primarily identified the drying temperature and the feed rate as the two spray-drying parameters that exhibit the most influence on the resulting particle morphology (Billon et al, 2000;Shur et al, 2008;Stahl et al, 2002). More specifically, the drying gas velocity was found to be the most significant parameter governing the production of silica micro-aggregates in a fluidized bed granulator (Hemati et al, 2003;Saleh et al, 1999). Whether similar results are obtained in the production of silica nano-aggregates are to be examined in the present work.…”

Modelling side-effect spray drying in top-spray fluidised bed coating processes

“…In layering, the coating solution collected on the particle surface has been dried sufficiently, preventing liquid bridge formation during particle collision. Consequently, a film of solid coating material builds up gradually at the particle surface (Becher and Schlü nder, 1998;Jiménez et al, 2006;Link and Schlü nder, 1997;Saleh et al, 1999;Smith and Nienow, 1983).…”