A hierarchical procedure for the conceptual design of solids processes

New discretization procedure for the breakage equation

“…Recently, these equations are also used in computer-aided simulation of processes containing solids processing steps; examples of solids plants include the production of potash, ammonium sulfate, citric acid, alumina, titanium dioxide, adipic acid, supported catalysts, and plants for coal and hydrometallurgical processes. The impetus for using PBEs is the desire to follow the evolution of the particle size distribution (PSD) from one equipment unit to another, which is essential for process design and optimization (Neville and Seider, 1980;Jones, 1984;Barton and Perkins, 1988;Evans, 1989;Rajagopal et al, 1988Rajagopal et al, , 1992. A generic form of PBEs is: Here, the dependent variable, n ( z , t ; u ) du, is the number concentration of particles having volumes between u and u + Correspondence concerning this article should be addressed to K. M. Ng.…”

The Effect of Heat Carrier Selection on the Structure of a Flowsheet

“…ethylbenzene f ethylene + benzene (7) ethylbenzene + H 2 f methane + toluene (8) is produced from ethylene and benzene as shown in reactions (3)- (5) and that the benzene is produced by the HDA chemistry shown in reactions (1) and (2).…”

Synthesis of processing system around a crystallizer

“…For example, consider the filtration and dewatering steps in the flow sheet. The choice of filter equipment based on slurry density and particle size has been discussed elsewhere (Rajagopal et al, 1992). Detailed ranking systems have been proposed by Purchas (1971).…”

“…The objective of this study is to address these questions by providing a systematic procedure for the synthesis of the processing system around the crystallizer. This constitutes part of our overall effort on the synthesis and simulation of solids plants (Rajagopal et al, 1992;Hill and Ng, 1997) and the synthesis of crystallization processes (Dye and Ng, 1995;Berry et al, 1997).…”