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IbD PU Deliverable 3.1 4.4 Rotor-stator technology The rotor-stator technology has been developed in the form of two main configurations: flat surfaces (also referred to as the rotor-stator spinning disc, RSSD) or concentric cylinders (referred to as the spinning tube-in-tube (STT) and Taylor-Couette reactor). 4.4.1 Rotor-stator spinning disk (RSSD) A rotor-stator spinning disk (RSSD) is a variant of the thin film SDR mentioned in the section 4.1. RSSD contains a rotating disk (rotor) locating between two static disks (stators). Small channels which are a few millimeters in height are formed between the rotor and stators, as shown in Figure 16. The spinning disk normally rotates around 1000 rpm and generates high shear thin films. Figure 16. Rotor-stator SDR equipment (Visscher et al., 2013). The RSSD has not been widely used in solid processing applications mainly because of the very narrow channels for flow. However, most recently, a novel type of rotor-stator spinning disk was proposed in van Eeten et al. (2015) for the entrapment of solid particles. Two conjoined spinning disks were used to replace the single disk in the traditional RSSD, as shown in Figure 17. The rotor-stator spacing, h, was equal to 1 mm, while the rotor-rotor inter-disk spacing, hr-r, could be set to either 1 mm or 10 mm. In their experiment, the volume between two rotors was filled with a reticulated carbon foam which was found to improve the particle containment in the reactor. The study found that the reticulated carbon foam played an important role in the particles entrapment. The particles with a diameter down to 17.8 μm could be completely entrapped with the gaps between rotors filled with the reticulated foam. The rotor-rotor gap had little effect on the entrapment of particles if the reticulated foam was not filled. 20PDF Image | Solids handling for intensified process technology
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