INDEX energy requirements

A second theoretical index, and one for which there appears to be more justification in its application to free-radical reactions, is the atom localization energy. This index is a measure of the energy required to localize one electron of the 7r-electron system in the aromatic molecule at the point of attack of the radical. The formation of the intermediate adduct in a free-radical aromatic substitution may be regarded as the sum of two processes one, the localization of an electron at the point of attack and the other, the pairing of this... 

Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to a size L2 of 100. im, that is q = 00. The size of material is taken as the size of the square hole through which 80 per cent of the material will pass. Expressions for the work index are given in the original papers 8,9) for various types of materials and various forms of size reduction equipment. 

In the work of Famini and Wilson,a molecular volume, Vmc, (units of 100 A ) is used to model the cavity term that measures the energy required to create a solute-molecule sized cavity in the solvent. The dipolarity/polarizability term, which attempts to account for dispersion-type interactions, is modeled by the polarizability index, tij, (unitless). This index is defined as the average molecular polarizability divided by the molecular volume, a/Vmc, and helps account for the correlation between polarizability and molecular volume. 

Bond (1952) postulated that the work required to reduce large feed particles, 4, to particles of diameter, d, is given by Equation 12.6. He also proposed a work index, IT, which is defined as the gross energy requirement in KWH/ton of feed needed to reduce the feed, 4, to a size that 80% of the material passes a 100 p.m screen. Table 12.4 is a list of typical work index values. Example 12.2 compares a result from this equation with direct data from a manufacturer s catalog. 

Hundreds of references to early literature. Searcher should consult not only volume which relates to specific subject but also indexes of other volumes—volume covering utilization as well as volume on treating for acid treating Some 141 chemicals giving method or methods of preparing each, material and energy requirements, flow sheet of reaction, use pattern, properties, economic aspects, statistics, manufacturers, and plant sites Hydrocarbon preparation... 

---