3 Dynamics of Spray Granulation in Continuously …
89
Fig. 12 Photos of a the sampling devices and the installed inline probe during continuous granulation, b an installed two-fluid-nozzle within the process chamber and c the used pilot plant
granulator [1]
particle size distribution. Additionally, an inline probe (IPP 70-S, Parsum GmbH,
Germany) for in-situ measurement of the particle size distribution was used.
The product granules were discharged by a two-deck tumbler screen in a size range
of 2.00–2.24 mm. After three times the average solids residence time, steady-state
was assumed. From this point onwards, samples were taken and analyzed according
to the following characteristics:
• Solids moisture content
• Surface morphology and roughness
• Solids density and porosity
• Compression strength
• Wetting behavior.
4.2 Particle Characterization
4.2.1 Solids Moisture Content
The solids moisture content of the hold-up material was analyzed thermo-gravimetrically using the moisture analyzer Precisa EM-120 HR (Precisa Gravimetrics AG).
For the analysis procedure a constant drying temperature of 105
◦ C was applied and
89
Fig. 12 Photos of a the sampling devices and the installed inline probe during continuous granulation, b an installed two-fluid-nozzle within the process chamber and c the used pilot plant
granulator [1]
particle size distribution. Additionally, an inline probe (IPP 70-S, Parsum GmbH,
Germany) for in-situ measurement of the particle size distribution was used.
The product granules were discharged by a two-deck tumbler screen in a size range
of 2.00–2.24 mm. After three times the average solids residence time, steady-state
was assumed. From this point onwards, samples were taken and analyzed according
to the following characteristics:
• Solids moisture content
• Surface morphology and roughness
• Solids density and porosity
• Compression strength
• Wetting behavior.
4.2 Particle Characterization
4.2.1 Solids Moisture Content
The solids moisture content of the hold-up material was analyzed thermo-gravimetrically using the moisture analyzer Precisa EM-120 HR (Precisa Gravimetrics AG).
For the analysis procedure a constant drying temperature of 105
◦ C was applied and