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Table 3. The Scale-up Batch and SDR Processes Disc Flow Diameter Rate [m] [mL·s-1] 0.1 2 0.3 18 1.0 200 Avg. Film Thickness [μm] 68.9 68.9 68.9 Residence Time [s] 0.270 0.270 0.270 Heat Transfer Coefficient in Film [kW·m-2·K-1] 52 52 52 Not so easy to quantify is the improvement in safety that a SDR gives when compared with a STR for the same production quantity. However, assuming a 5 m3 is operated 80% full then replacing it by a 60 cm disc which has a film volume of ca. 14 mL then the volume of chemicals involved is reduced by a factor greater than 280.000! What you haven’t got can’t hurt you! Experimental Equipment: The SDR (20 cm) is commercially available from Triton Newcastle/UK. A Micropump G18 was used for dosing materials with viscosities between 0.2 and 200 mPas. A Liquiflo 39F was used for dosing materials with viscosities above 200 mPas. A Julabo FP50- HE and a Julabo SE-6 were used as thermostats. The UV-Lampe employed was puchased from UV Light technology (UV 400S) and had a nominal power of 400 W in the wavelength range from 280 to 400nm. Analyses: A Visco-Tester 7R from Haake was used to measure viscosities. GPC were performed using a standard Waters machine. The GC was calibrated with tetradecane. A Mastersizer 2000 from Malvern with water or isopropanol as disperse phase was employed for the light scattering measurements. UV-VIS spectra were measured using a Specord 205 from Analytik Jena. TEM was carried out on a Philips CM 120. 13PDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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