Some other Considerations

The above scaling rules have been found by experience to be valid in cyclones of somewhat conventional designs operating at low solids loadings and normal inlet velocities. 

But cut size, grade-efficiency and pressure drop in such conventional designs are not the only items one must consider when designing a cyclone or evaluating its performance. Other factors will often play a crucial role these may include  

Most of these factors are discussed elsewhere in this book. The effects of the natural turning point and solids loading are discussed in Chap. 9. 

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Correct this area by dividing the fraction of capacity at which the designer intends for the column to operate. A value of 0.7 is recommended, unless some other consideration suggests a different percentage. 

In practice, the production of vanadium by aluminothermic reduction is also governed by some other considerations. The reduction has to be carried out under an inert atmosphere (helium or argon) to avoid nitrogen pick-up from the air by vanadium metal. The composition of the oxide-aluminum charge has to be so chosen that the thermit (metal obtained by aluminothermic reduction) contains between 11 and 19% aluminum. This is necessary for the subsequent refining step in the vanadium metal production flowsheet. Pure vanadium pentoxide and pure aluminum are used as the starting materials, and the reduction is conducted in a closed steel bomb as shown in Figure 4.17 (C). 

Some other considerations relative to polymer reactivity are as follow ... 

Some other considerations relating to standards for drug names, labeling standards, and packaging standards are as follows ... 

A one-step elimination mechanism via TSse was suggested to be not viable for a series of complexes/ac-L2PtMe3(Z), where L2 = dppe (7) or dppbz (8) and Z = OAc or OAr (Fig. 5) [23, 24]. It was shown that additives of nucleophiles in the form of -Bu4N(0Ac) (Z = OAc) or [K 18-crown-6] (OAr) (Z = OAr) in THF solutions of the complexes above do not affect the rate of the C-O elimination from the Pt center. On the basis of the absence of a linear dependence between the C-O elimination rate and concentration of nucleophile additives in solution as well as some other considerations, it was concluded that the reaction does not follow a one-step mechanism including a direct nucleophilic attack upon six coordinate starting complex (Fig. 9, dashed line) but rather follows a two-step nucleophilic mechanism (Fig. 4, path a Fig. 9, solid line). 

Before accepting Heskett et al. s model as a basis to build upon, some other considerations are required. We have seen a number of important considerations take on increasing importance in the business environment. Healthcare is a business this is more obvious in some countries than it is in others—those without a social welfare system that includes a measure of state provided health services—and within which an important partner/ supplier is the health insurance provider. Both sectors are cognizant of the impact of their role on the socioeconomic fabric of the environment within which they operate. Accordingly we should modify Heskett et al. s model [17] to include this increasingly important consideration see the following socially responsible value equation ... 

The partitioning of a solute i between two immiscible liquid phases 7 = 1 and 2 and the selectivity between two solutes in the two-phase system have so far been considered primarily in the conteid of liquid extraction/solvent extraction in large-scale operations. Many such aspects and some other considerations are also important far the basic equilibria in liquid-liquid chromatography (LLC) (see Section 7.1.5). In LLC, a mobile liquid phase (7 = 2) flows over a porous, finely divided solid phase whose surflice has been coated with a liquid, the stationary phase (J = 1). Any solute introduced via the mobile phase is partitioned between the two liquid phases. For cases where the regular solution-theory based expression (4.1.34f) for Ki may be written as... 

The next consideration is usually of how much suspended solid has to be removed per unit time, which in concert with the solids retention (dirt-holding) capacity of the filter medium, will decide the operating cycle time (or, of course, the cycle time may be fixed by some other consideration, so that the dirt-holding capacity will have to match that time requirement). 

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