Photographic processing, heterogeneous

A photograph of different types and sizes of catalyst is shown in Figure 10-5(a). A schematic diagram of a tubular reactor packed with catalytic pellets is showm in Figure I0-5(b). The overall process by w-hich heterogeneous catalytic reactions proceed can be broken down into the sequence of individual steps shown in Table 10-2 and pictured in Figure 10-6 for an i.somerizalion reaction. 

Our definitions of phases or multiphases, respectively, include interfacial events, but it must be emphasized that the engineer s definition of interphases or interfacial engineering concentrates more on solid-solid phase boundaries such as in the manufacture of chips, photographic films, polymer composites, advanced ceramics, etc. [12], or on processes with heterogeneous catalysts and other phases [13], Last, but not least, the possibility of placing the emphasis on greener techniques and thus so-called sustainable operations [14] may be mentioned in passing. 

Photograph 7-11 Extremely heterogeneous clinker containing large concentrations of loosely packed yellow-amber belite and alite with a wide range of crystal sizes and, like the belite, a nonuniform distribution. Free lime is abundant (dark, round crystals). Sandy, silica-rich raw feed with coarse quartz. Gas-fired dry-process kiln, 3000 tons/day. (S A6631)... 

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