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IbD PU Deliverable 3.1 7.6 Magnetic field Magnetic fields can be used for process intensification combined with classical fluidization technology. The movement of solids that are magnetic can be controlled by the externally applied magnetic field. The ability to control the solid movement in the reactor yields the advantages of a magnetically stabilised bed (MSB) with respect to system mechanics, such as enhanced heat and mass transfer, permitting the solid separation, and pseudo-homogenous bed expansion with particle mixing (known as magnetically stabilized bed). 7.6.1 Solids-solids separation A magnetically stabilized bed (MSB) is a fluidized bed of magnetizable particles subjected to a spatially uniform and time invariant magnetic field oriented axially with a fluidizing flow. The MSB reactor can use fine particle catalysts which can be kept or replaced in the reaction process. The MSB is a better alternative for dry solids-solids separations than the non-magnetic fluidized bed (Luo and Chen, 2001). The conventional air separation method using air as the separation medium with a magnetic tracer has low separation efficiencies with the proportion of misplaced magnetite above 40% (Dong and Beeckmans, 1990). In the study of Luo and Chen (2001), the MSB used a mixture of magnetite powder and fine coal of 0.45–0.9 mm as a medium solid could separate the 50 x 6 mm coal efficiently with a probable error of 0.05. 7.6.2 Industrial application of MSB The first application of an MSB reactor which was built by Shijiazhuang Chemical Fiber Company (Figure 61) was used and studied by Zong et al. (2013). The MSB reactor unit with a 60 kt/a caprolactam hydrofining unit (equal to 200 kt/a production capacity of 30% caprolactam solution) is 900 mm in diameter and 5 m in height with six electromagnetic coils. The MSB reactor used an amorphous Ni alloy catalyst as the solid phase. 62PDF Image | Solids handling for intensified process technology
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