Analysis of Crystallization Processes Using Spreadsheet Software

Takahiro NISHITA, Hiroshi TAKIYAMA, Yasuo YAMAZAKI
2010 Journal of Computer Chemistry, Japan  
In chemical industries, the methods for the design of crystallizers and the analysis of crystallization processes are somewhat complicated, and hence, only skilled engineers can perform them. Therefore, a tool to design crystallizer and analyze crystallization processes handily in a short time is required for engineers who have little knowledge about design theory of crystallizers. When the crystallization process is analyzed, it is easy to sample the slurry and to measure the crystal size
more » ... e crystal size distribution and the suspension density, but the phenomena in the crystallizer cannot be learned completely. It is, therefore, necessary to evaluate the changes in the nucleation rate and the linear growth rate simultaneously depending on the supersaturation that is a driving force of crystallization phenomena. Previously, a design chart had been used to evaluate the operation parameters for crystallization, such as the nucleation rate and the linear growth rate [1], but expert knowledge was necessary in order to interpret the results, and it took some time to analyze them [2] . Consequently, in this study, a simplified tool, namely, "Crystallization Add-in" with spreadsheet software such as Microsoft Excel (hereafter denoted as Excel) has been developed to calculate the operation parameters for crystallization based on design theory of crystallizers [3, 4] . By using this tool, even the engineers who have no knowledge or only have a little knowledge about the design chart and crystallization operation can calculate the operation parameters for crystallization in a short time. In this report, the theory that is necessary to calculate the operation parameters for crystallization is introduced, and some analysis results of the real industrial crystallization processes obtained with this tool are investigated. Figure 1 shows the phenomena and those interrelations in Phenomena in the crystallizer
doi:10.2477/jccj.h2202 fatcat:vgfadn6ylvgkhpgnebnv6aqpy4