Kinetic dispersion mill

High-Speed Dispersers Horizontal Mill Kinetic Dispersion Mills Other Mills... 

Kinetic Dispersion Mills. Another important mill is the Kady mill developed by Charles Kew of the Kinetic Dispersion Corp. (21). By many it is considered another high-speed dissolver because both use a high-speed impeller even though there are basic differences between the two mills. 

The high-speed impeller or shear mixer is the most eommon equipment to prepare dispersions of solids in liquid. High speed shear mills and kinetic shear mills have retained their usefulness beeause of their ability to deagglomerate material that is not adequately dispersed in the premixing step. A high-speed shear mill is eomposed of two elements - a container and an impeller. These faetors are important in the design ... 

Swaroop et al. [Powder Technology, 28, 253-260 (Mar.-Apr. 1981)] found that the material holdup is higher and the vessel dispersion number Dl/L (see subsection on Continuous Mill Simulation) is lower in the rod mill than in the ball mill under identical dimensionless conditions. This indicates that the known narrow-product-size distribution from rod mills is partly due to less mixing in the rod mill, in addition to different breakage kinetics. 

Therefore, the key step for the in-situ polymerization of PUCNs is the dispersion of CNTs in macromolecular polyols. In order to reduce the aggregations, it is necessary to physically or chemically modify the surface of CNTs to reduce the van der Waals force among the nanotubes. Strong mechanical tools such as ball milling and ultrasonic treatment can be used to help break down the aggregation of CNTs. The kinetics of PU chain growth should be taken into account although it is rarely reported in up-to-date publicahons. 

Mills and Bennett made an extensive kinetic study at 100-1000 atm and 400 and 450 °C on doubly promoted catalysts [48]. H2/N2 ratios of 3/1,1/1 and 2/1 were used and the space velocities ranged from 2000 to 230000 h The reactor used held 1.625 g or 0.602 cm of catalyst and had the dimensions 4.76 cm in diameter and 5 cm long. The maximum temperature difference recorded was 3 °C and in most cases it was less than 1 °C. Approximate calculations demonstrated that the experimental data should be free of axial or radial dispersion of heat or mass. The size of the catalyst used was 2 mm diameter, and intraparticle diffusion effects were thought to be absent. The lowest effectiveness factor estimated was 0.88. Reduction of the catalyst was done according to the procedures of Nielsen [35]. 

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