Processing/Mixing Equipment

Process and Equipment. Rigid polyurethane foam processes use the same high or low pressure pumping, metering, and mixing equipment as earher described for flexible foams. Subsequent handling of the mixture is deterrnined by the end product desired. 

Selection of Equipment The principal factors which influence mixing-equipment choice are (1) the process requirements, (2) the flow properties of the process fluids, (3) equipment costs, and (4) construction materials required. 

There are no satisfactory specific guides for selecting mixing equipment because the ranges of application of the various types of equipment overlap and the effects or flow properties on process performance have not been adequately defined. Nevertheless, what is frequently done in selec ting equipment is described in the following paragraphs. 

Mixing of sohds is an important unit operation in the production of solids with consistent properties. A number of properties of the solid particles influence the mixing process, the design, and selection of mixing equipment. The second subsection elaborates on the theoiy of mixing, types of mixing equipment, and their operation. 

Franklin Miller Inc. Crushers, mills, shredders and mixing equipment for chemical processing, waste reduction and wastewater treatment. http //WWW. franklinmiller. com... 

EMI Incorporated Manufacturer of fluid mixing equipment, including impeller designs for flow controlled applications in chemical processing, coatings, food, and pharmaceutical, http //www.emimixers.com... 

Since the processing conditions and mixing equipment have a crucial effect on the morphology of immiscible polymer blends [45], experiments were carried out in four different types of extruders to find optimal conditions for blend preparation and fibrillation. Nevertheless, the morphologies of PP-LCP blends produced by... 

Figure 5-30. Effect of power on process result with constant D/T ratio. By permission. Fluid Mixing, Lightnin (formerly Mixing Equipment Co.), a unit of General Signal.

Second, it is necessary to take account of non-Newtonian behaviour in the design of process plant and pipelines. Heat and mass transfer coefficients are considerably affected by the behaviour of the fluid, and special attention must be devoted to the selection of appropriate mixing equipment and pumps. 

In mixing, there are two types of problems to be considered — how to design and select mixing equipment for a given duty, and how to assess whether a mixer is suitable for a particular application. In both cases, the following aspects of the mixing process should be understood ... 

Jenike, A. W. and Johnson, J. R. (1970) Chem. Eng. Prog. 66 (June) 31. Solids flow in bins and moving beds. Jones, R. L. (1985) Chem. Engr., London No 419 (Nov.) 41. Mixing equipment for powders and pastes. Jones, A. G. (2002) Crystallisation Process Systems (Butterworth-Heinemann). 

---