Degree Type
Dissertation
Date of Award
1982
Degree Name
Doctor of Philosophy
Department
Chemical and Biological Engineering
Abstract
The photomicrographic technique was used to study the secondary nucleation and growth characteristics of ammonium dihydrogen phosphate-water system. The contact nuclei were produced by contacting the growing 100 face of an ADP crystal. Experiments were conducted at different levels of undercooling and the macroscopic mechanism of growth was determined to be size-independent with the contact nuclei exhibiting growth rate dispersion;Based on the current investigation and the previous ones on potassium nitrate and citric acid monohydrate, a macroscopic "Constant Crystal Growth" model is proposed;The Constant Growth Model was also used to develop mathematical models for both continuous and batch crystallizers. The technique of Laplace transformation was used to relate the birth distribution, the growth rate distribution and the product crystal size distribution for both continuous and batch systems. A number of anomalies reported in the literature have been explained using this mathematical development. A procedure to determine growth rate kinetics in the presence of growth rate dispersion is also presented for the batch citric acid monohydrate-water system.
DOI
https://doi.org/10.31274/rtd-180813-11172
Publisher
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Copyright Owner
Kuttanchery Ramanarayanan
Copyright Date
1982
Language
en
Proquest ID
AAI8307784
File Format
application/pdf
File Size
157 pages
Recommended Citation
Ramanarayanan, Kuttanchery, "Growth rate dispersion in batch and continuous crystallizers " (1982). Retrospective Theses and Dissertations. 8381.
https://lib.dr.iastate.edu/rtd/8381
